Abstract: A corrosion-resistant tension member, particularly an inclined cable of a cable stayed bridge, is comprised of a bundle of individual elements, for example, steel wire strands, which in the open area is encapsulated by sheathing, and which in the area of a rerouting point, for example, at the pylon of a cable-stayed bridge, extends inside a saddle pipe in a canal having the shape of a circular arc. In order to avoid impairments at the ends of the saddle pipe when sheathing is connected to the structure, the saddle pipe is extended in the shape of a circular arc beyond a tangential exit of the bundle by a length L so that the bundle is exposed at an end of the saddle pipe without any risk of abutting.

Abstract: Pre-stressed, strip-type tension members are applied to supporting structures, especially concrete supporting structures. To this end, a clamping device is used to pre-stress the tension member at least at one end, at a distance from the surface of the supporting structure, by a temporary clamping element which is fixed to the tension member, and the tension member is then pressed onto the surface by at least one permanent brace. The two temporary clamping elements are removed from the surface once the tension member has been pressed onto the surface.

Abstract: A hold-down for securing first and second support members in a portion of a building to an anchoring device extending from another portion of the building. The hold-down may include a first flange having securement apertures therethrough configured to receive fasteners adapted to secure the first flange to the first support member. A second flange may have securement apertures configured to receive fasteners adapted to secure the second flange to the second support member. A base may connect the first and second flanges and have an aperture sized and positioned to receive the anchoring device therethrough. The first and second flanges may be configured to be loaded substantially exclusively in tension by the anchoring device.

Abstract: An anchor for engagement with a post-tension tendon includes an anchor base having a generally tapered wedge receiving bore. A sheath surrounds the anchor base. The sheath has a substantially cylindrical extension on one side of the anchor base for contacting the tendon at a distal end thereof from the anchor base. The extension is formed integrally with the sheath and has a seal disposed therein proximate the distal end. A cap having external threads thereon is for engaging corresponding internal mating threads on the sheath on a side of the anchor base opposite to the sheath extension. The cap has a tool engagement surface thereon to facilitate rotation by a tool for engagement with the sheath.

Abstract: The present invention relates to a buckling restrained brace capable of absorbing vibration energy produced by an earthquake, wind power and the like, in a building and a steel structure. The buckling restrained brace of the present invention is accomplished by a buckling restrained brace 1 wherein a steel-made center axial member 3 is passed through a buckling-constraining concrete member 2 reinforced with a steel member 6, and an adhesion-preventive film 4 is provided to the interface between the steel-made center axial member and buckling-constraining concrete 5, the adhesion-preventive film showing a secant modulus in the thickness direction of at least 0.

Abstract: A column to structure attachment device and method is disclosed for securing a support column between a base structure and a beam structural member. The device includes a structural column having a first end and a second end with a void parallel to a longitudinal axis of the column such that the void forms a communication therethrough between the first end and second end. Also included is a first end adapter element that engages the column first end and a second end adapter element that engages the column second end. In addition, an element is provided for maintaining compressive loading on the column between the first end adapter element and the second end second adapter element and is operational to maintain the compressive loading under all anticipated external loading conditions acting upon the column to structure attachment device through the base structure and the beam structural member.

Abstract: Anchor 10 for reinforcing a structure against displacement forces and a method of installation includes drilling a borehole 50 in an anchor medium 110 adjacent the structure A length of roving 21 composed of filaments 24 is doubled and pushed into borehole 50 with free end 23 of roving 21 protruding. Backfill grout 41 or resin 42 is pumped or poured into bore hole 50 to embed roving 21 Filaments 24 of free end 23 are spread apart and attached to the structure by adhesive.

Abstract: An anchoring device for a corrosion-protected tension member includes an anchor body, which is provided with bores for the passage of the tension elements. Sealing discs, which can be compressed by means of a pressure plate and threaded bolts, are provided on a face of the anchor body and lie opposite a downstream face. A perforated disc, which is enclosed by two supporting discs, is located downstream of the sealing discs and the pressure plate. The perforated disc acts as a spacer for the tension elements and is fixed between lugs that are opposite an anchor tube and that is connected to the anchor body. The locking of the perforated disc enables the position of the tension elements to remain parallel, even when the sealing discs are compressed to activate the seal. If individual tension elements have to be replaced, the loosening of the threaded bolts allows the sealing discs to “breathe” and to return to their original position.

Abstract: A corrosion-resistant tension member, particularly a tendon for prestressed concrete, comprising a bundle of tension elements arranged inside a sheathing, has at its ends anchoring devices each with an anchor plate. On the side of the anchor plate facing away from the open air side, a seal having tension elements running through it and having a sealing plate are arranged, the sealing plate being fixed in place on the side facing away from the anchor plate opposite the anchor body against longitudinal displacement. Between the anchor plate and a pressure plate butting against the sealing plate, pressure-transferring means, for example, a pressure tube, are provided, having a length calculated in such a way that a longitudinal displacement of the anchor plate that occurs when the tension elements are being tensioned, actuates the exertion of surface pressure to the sealing plate for activating the seal.

Abstract: A PSSC complex girder in which a section shape steel structure is formed by joining one or more section shape steel. The PSSC complex girder includes a tension means for tensioning the section shape steel structure with a tensional member so that the structure has a predetermined camber. Concrete is poured in an inner space portion of the section shape steel structure. A strengthening plate for supporting buckling and compression is joined to the section shape steel. A sheer prevention member and steel reinforcement are joined to the section shape steel and the concrete is poured therein. The camber of the PSSC complex girder can be adjusted before or after construction for new bridges and conventional bridges. Deflection of the slab can be easily decreased and cracks caused by flexural deformation can be prevented.

Abstract: Outer cables disposed in a box girder in the longitudinal direction of a box girder bridge to prestress the box girder each have a transparent sheath made of a transparent polyethylene resin, vinyl chloride resin, polypropylene resin or the like, thereby allowing the grouting condition in the sheath to be inspected reliably and easily. If a colored grout is filled, the filling condition can be inspected even more reliably and easily. In addition, it is possible to readily find a portion left unfilled after the grout has hardened and to refill it for repairing by using openings for injection and ejection made at each side of the void left.

Abstract: A tension member comprising a plurality of fiber filaments gathered into a plurality of strands. The filaments run close together, and a protective sheath is provided around the strands. Each strand is coated on the exterior thereof with a strand sheath of a material having a low friction coefficient, permitting the strands to move longitudinally in relation to one another and independently of each other.

Abstract: A pre-stressing sheath for preventing wet concrete from penetrating between the sheath and strands being debonded, and for covering sections of reinforcing strands in pre-stressed concrete beams such that any potential strand tension transmitted to a beam is nullified by allowing the strands to slide freely within the pre-stressing sheath. The pre-stressing sheath is made up of a first hollow cylindrical sheath section having a longitudinal slit that allows the first sheath section to be opened and placed about the concrete reinforcing element, and a second hollow cylindrical sheath section having a longitudinal slit that allows the sheath section to be opened and placed about both the concrete reinforcing element and the first sheath section. The first sheath section further includes an integral outwardly projecting ridge for interlocking with the longitudinal slit of the second hollow cylindrical sheath section.

Abstract: Pre-tension and post-tension processes for the manufacture of pre-stressed structures in which bonded carbon fiber cables are provided with burial anchors and temporary anchors outward of the burial anchors. The burial anchors are embedded in the structure. The temporary anchors enable stressing of the carbon fiber cables.

Abstract: In a method for designing a multi-step tension prestressed girder, prestress is appropriately introduced with respect to a relationship between a load and stress, for each step of construction, so that the height of a profile of the girder can be reduced. In a method for fabricating a multi-step tension prestressed girder, prestress is appropriately introduced with respect to a relationship between a load and stress, for each step of construction, so that the height of a profile of the girder can be reduced.

Abstract: A storage rack has upright columns supporting vertically cambered beams having step box or channel shapes accommodating a generally horizontal deck for carrying pallets and product loads. The beams have upward cambers or convex curvatures that increase the load carrying capacity of the rack.

Abstract: An expansive filler joint includes: a securing hollow body (1) embedded in a jointing end (3, 3) of forming concrete (K) or concrete segmental products (K?, K?), the securing hollow body (1) made of a rigid material and having a closure means (2) disposed at a plurality of side ends of the securing hollow body (1), an expansive filler (4) filling the securing hollow body (1), and reinforcing bars (5, 5) inserted into the securing hollow body through the closure means (2) and opposed to each other, wherein the opposed reinforcing bars (5, 5) are secured by prestress and pressure of expansion of the filler (4).

Abstract: A column to structure attachment device and method is disclosed for securing a support column between a base structure and a beam structural member. The device includes a structural column having a first end and a second end with a void parallel to a longitudinal axis of the column such that the void forms a communication therethrough between the first end and second end. Also included is a first end adapter element that engages the column first end and a second end adapter element that engages the column second end. In addition, an element is provided for maintaining compressive loading on the column between the first end adapter element and the second end second adapter element and is operational to maintain the compressive loading under all anticipated external loading conditions acting upon the column to structure attachment device through the base structure and the beam structural member.

Abstract: A prestressed, roof-ceiling construction with flat-soffit for constructing an industrial large-span building with a bearing plane-space by assembling pre-fabricated elements. A problem of constructing flat-soffit, finished ceilings in large-span buildings is solved whereby besides an aesthetic ceiling look, the heating volume is reduced, ventilation is ensured and an isolated loft space is provided through which all kinds of installations can be guided. The construction includes a wide and thin concrete plate with a two-part upper, steel construction, interconnected by vertical elements. The construction is twice prestressed by two independent methods. The soffit concrete plate is prestressed centrally in the mould and after the plate concrete is hardened, the upper steel construction is prestressed by pushing apart, at the midspan, the steel separated halves which are then connected.

Abstract: A wall includes a plurality of wall members stacked substantially vertically and including a bottom wall member and a top wall member. Each wall member has an upper surface in opposed relation to a lower surface and a through opening extending from the upper surface to the lower surface. A through opening in each wall member is aligned with a through opening in all other wall members so as to form a through opening in the wall extending from the upper surface of the top wall member to the lower surface of the bottom wall member. A rod, having an upper end in opposed relation to a lower end, is positioned in the through opening of the wall and a lower fastener attaches to the lower end of the rod adjacent the lower surface of the bottom wall member. An upper fastener attaches to the upper end of the rod adjacent the upper surface of the top wall member, and an actuator is positioned between the upper fastener and the upper surface of the top wall member for applying a downward force to the top wall member.

Abstract: A precast post-tensioned segmental pole system capable of supporting a load is provided. The pole system includes a plurality of pole segments that use connectors and strands to anchor them together. The strands extend within a cavity formed in the pole segments and are external to the wall structure of the pole segments. The strands may be coupled between both of the pole segments, or be anchored to a connector. The connector includes an upper piece that is coupled to one pole segment, and a lower piece that is coupled to the other pole segment. Upper and lower pieces interlock with each other to join the pole segments to one another. The strands are placed in tension so that pole system is capable of withstanding forces imposed by the load.

Abstract: A fence construction system and a method for building such a fence are provided. The fence looks like a wall and has wall characteristics, such as a post-tension condition, but is much less expensive and easier to build. A ratcheting system or tensioning system is used to tension the tensile wires which are then secured to the fence posts. A wire lath is applied to the tensile wires and coating material is then applied to the surface of the wire lath. After forming the fence construction, the tensile wires are released and the ratcheting posts are removed. The fence construction system can be used to build a fence portion of up to 300 feet long at one time.

Abstract: A system and method for securing the wall framing and roof of a building structure against wind. A cable tensioner, located between two uprights of the wall framing and below the top plate, is attached to an anchor secured in the foundation. A cable extends over the first roofing member, under the top plate, over a second roofing member, through the cable tensioner, and over a third roofing member. In another embodiment, a cable tensioner has a vertical sleeve, a hollow tube affixed to the vertical sleeve, a rod extending through the vertical sleeve, and a nut threaded onto the nut for tensioning the cable.

Abstract: A wooden beam (1) has several sections which are subjected to a transversal tension and which affect in particular the areas in which there are recesses or openings (3). Rod-shaped elements are provided in the form of screws (4) which are introduced in such a way that they extend crosswise to the longitudinal direction of the beam (1) in order to absorb this transversal tension. These screws are screwed in from the top side (5) or the underside (6) of the beam (1) and each extend over part of the height (H) of the beam (1) only and are therefore directly associated with the area (2) that is subjected to transversal tension.

Abstract: A fence construction system and a method for building such a fence are provided. The fence looks like a wall and has wall characteristics, such as a post-tension condition, but is much less expensive and easier to build. The method includes the steps of erecting a plurality of fence posts including two end fence posts, erecting two stressing posts within and closely adjacent the two end fence posts, placing a respective spacer between each stressing post and the adjacent end post, stringing a plurality of high-tension tensile wires between the two end posts, tensioning the high-tension tensile wires, securing the high-tension tensile wires to the fence posts, securing wire lath to the pre-stressed high-tension tensile wires and fence posts, applying fence coating material to the wire lath, cutting the high-tension tensile wires between the end fence posts and the stressing posts, and removing the spacers.

Abstract: A post-tension anchor system including an anchor body having a polymeric encapsulation extending therearound in which the encapsulation has a tubular portion integrally formed therewith and extending outwardly from the anchor body. A tendon is affixed within a wedge-receiving cavity of the anchor body. The tendon has a sheathed portion and an unsheathed portion. A seal member is affixed to an end of the tubular portion opposite the anchor body. The seal member has a portion extending around the sheathed portion of the tendon in generally liquid-tight relationship therewith. The tubular portion has an interlock area extending therearound for engaging an interior surface of the seal member. The tubular portion has a length of generally greater than four inches extending outwardly of the anchor body. A plurality of wedges are positioned in interference-fit relationship with the unsheathed portion of the tendon within the wedge-receiving cavity of the anchor body.

Abstract: An unbonded post-tensioning system and method are disclosed, as well as concrete structures utilizing an unbonded post-tensioning system. A void is created and maintained through the concrete structure in which at least one stainless steel strand is placed and tensioned. The void containing the cable is maintained unfilled. Strands may thus be removed and inspected, and reinserted or replaced as necessary. The invention has the advantages of reducing corrosion and permitting non-destructive inspection and replacement of individual strands.

Abstract: An apparatus and method for reducing corrosion in post-tension construction is described. An anchor base having an aperture with at two continuously opening surfaces is used with a post-tension tendon. A sheath surrounds the anchor and includes a cylindrical extension having a contact end distal from the anchor base for contacting the tendon as the tendon is inserted through the cylindrical extension and the anchor base aperture. The method positions an anchor base in a selected location so that a tendon end can be inserted into the anchor base to engaged the contact end distal from the anchor base. The tendon is threaded through the anchor base until a selected length extends through the base. The tendon is tensioned, a segment of the tendon sleeve is removed proximate to the anchor base, and a wedge is anchored between the tendon and the anchor base.

Abstract: An apparatus and method for reducing corrosion in post-tension construction is described. An anchor is engagable with a post-tension tendon and comprises an anchor base and sheath engaged with the anchor base, and a cap for sealing the portion of the tendon within the anchor. The sheath can include an extension having a contact end distal from the anchor base for contacting the tendon as the tendon is inserted through the extension and the anchor base aperture. The cap can extend completely through the anchor base for connection to the anchor base of a sheath or sheath extension attached to the base. A pocketformer is attachable to the sheath for generating a void in concrete.

Abstract: An apparatus and method for reducing corrosion in post-tension construction is described. An anchor is engagable with a post-tension tendon and comprises an anchor base and sheath engaged with the anchor base, and a cap for sealing the portion of the tendon within the anchor. The sheath includes a cylindrical extension having a contact end distal from the anchor base for contacting the tendon as the tendon is inserted through the cylindrical extension and the anchor base aperture. The cap can include a detachable extension for supporting a pocketformer having an aperture therethrough.

Abstract: A tie-down apparatus for building structures, including mobile homes. The structure is constructed with a plurality of structural members including channel members disposed therein. In one embodiment, channel members are formed in both the roof structural members and the sidewall structural members. A tie-down cable is disposed within the channels and the two terminal ends thereof releasably engaged with hooks. The hooks are further attached to ground anchors located within the ground adjacent structural sidewalls. A tensioning mechanism is disposed near one terminal and of each of the tie-down cables for simultaneously applying a tensioning force to the tie-down cables, that in turn directs a downward force on the roof structural members thereby retaining the roof in place during high wind conditions.

Abstract: A device for connecting a beam to pillars or similar supporting structural elements in order to erect buildings, particularly multistory buildings, by means of prefabricated concrete components, the device comprising first means for connecting two end regions of the beam to the pillars and second means for connecting the beam to the pillars, the first connection means provide a coupling at least of the hinge type between each one of the two end regions of the beam and the corresponding pillar; the second connection means comprise at least one tension element that passes through the beam and is connected to the pillars by means of the ends thereof that protrude from the beam.

Abstract: A hold-down for securing first and second support members in a portion of a building to an anchoring device extending from another portion of the building. The hold-down may include a first flange having securement apertures therethrough configured to receive fasteners adapted to secure the first flange to the first support member. A second flange may have securement apertures configured to receive fasteners adapted to secure the second flange to the second support member. A base may connect the first and second flanges and have an aperture sized and positioned to receive the anchoring device therethrough. The first and second flanges may be configured to be loaded substantially exclusively in tension by the anchoring device.

Abstract: A fastener assembly 10, in respect to forces which are subsequently applied, after the installation thereof, when forces is applied in one direction, this fastener assembly 10 is self adjusting incrementally, as needed in travel or actuation; yet when a force is applied in the opposite direction, this fastener assembly 10 is not self adjusting and there is no travel or actuation.

Abstract: An anchorage for a post-tension system including an anchor body having an interior cavity and a generally flat end surface, a tendon extending through the interior cavity of the anchor body, a plurality of wedges in interference-fit relationship between a wall of the interior cavity and a surface of the tendon, a cap member positioned outwardly of the flat end surface, and a ring juxtaposed against the inner surface of the cap member. The ring is physically deformed so as to provide a visual indication of a desired amount of tension applied to the tendon. The ring is received within an annular slot formed in the flat end surface of the anchor body.

Abstract: A device for connecting a beam to pillars, or similar load-bearing structural elements, for constructing buildings, particularly multi-story buildings, by way of prefabricated concrete components. The device comprises a first connection for connecting the two end regions of the beam to the pillars and a second connection for connecting two intermediate regions of the longitudinal extension of the beam to the pillars. The first connection is constituted by connection elements of the interlocking type and the second connection comprises at least two rigid inclined ties, each of which connects an intermediate region of the beam to a region of the respective pillar which lies at a higher level than the region where the tie is coupled to the beam.

Abstract: In order to install or tension a brace (1) having a false bearing, for example a stay cable for a cable-stayed bridge, an external tensioning member or similar comprising a bundle of plastic-sheathed individual elements (2) made of steel, for example, wires, strands of wires or similar, the individual elements (2) are exposed in the area of the anchoring in order that they may be anchored at this point in holes (6) in an anchoring plate (7) which is supported by the building structure (9) by means of wedges (5). In order to ensure that when the strand is anchored the remaining plastic jacket (4) ends as close as possible to the anchoring plate (7), it is suggested that the plastic jacket be prevented from making any longitudinal movement during the extension of each individual element (2) which occurs during tensioning by a stop in the form of an annular shoulder (6d) which surrounds the element (2) in the anchoring area, and thereby compressed.

Abstract: A shear wall panel is utilized in building walls to reduce the tendency of the wall from moving relative to a foundation during periods of external forces (e.g. earthquakes, tornados, or hurricanes). The shear wall panel includes a top and a bottom horizontal support, a first and at least a second parallel and vertical support, and a third vertical support parallel to the first and second vertical supports. The top and bottom horizontal supports are parallel to one another and are located proximate the top and bottom of the wall respectively. The first and second vertical supports each have a first and a second end secured to the top and bottom horizontal supports respectively, and are perpendicular to the top and bottom horizontal supports. The third vertical support includes a first end portion, a second end portion, and a connector. The first end portion passes through the bottom horizontal support and is secured to the foundation.

Abstract: A method and apparatus for post-tensioning a reinforcing strand disposed within a concrete slab of the character having a plurality of reinforcing members embedded therein. The apparatus includes a yieldably deformable elastomeric body having a longitudinally extending passageway formed therein for receiving the reinforcing strand. The apparatus also includes a removal mechanism for use in expeditiously removing the elastomeric body from the concrete slab after the slab has been poured.

Abstract: A method of reinforcing a structure with an additional member, said additional member comprising one or more sub-units comprising the steps of: (a) inserting pre-cooled or pre-heated shims (6) of shape memory alloy between said member (4, 8) and said structure (2, 3) or between at least two of said sub-units; (b) allowing said shims to expand on subsequent cooing or warming so as to force said member into compression or tension against said structure, simultaneously driving an adjacent portion of said structure into tension or compression.

Abstract: A self-bearing curtain wall system is provided, the system including a matrix of unitized kinematically integrated cladding panels flexibly joined to a structural member so as to thereby responsively anchor said matrix of unitized cladding panels. Adjacent cladding panels of the matrix of unitized cladding panels are responsively linked horizontally and vertically for horizontal and vertical rotation. Horizontally adjacent cladding panels of the matrix of unitized cladding panels are responsively joined to a cable type structural member via an anchor fixture, which allows the structural member to move freely along the wall.

Abstract: A composite structural member with pre-compression assembly. The apparatus comprises a plurality of longitudinally extending composite units. Each composite unit comprises a plurality of longitudinally extending girders or beams disposed on the bridge supports and a deck portion made of a moldable material and attached to the beams. Pre-compression is used for clamping adjacent units together such that a gap or hardened grout-filled joint between the deck portions thereof is substantially closed. The pre-compression portion of the apparatus includes a threaded member disposed through holes in facing beams of adjacent composite units with a fastener engaging the threaded member so that tightening of the fastener on the threaded member pulls the adjacent units together. The deck portions of the composite units may use a tongue-in-groove construction, and adhesive may be placed in the gap between the deck portions.

Abstract: A concrete tensioning band is disposed on a surface of unhardened concrete and tensioned by being attached to a clamp disposed on the base, and then displacing the clamp by a drive mechanism disposed on the clamp. Such displacement serves to tension the band. Spacers are positioned between the clamp and the base to hold the clamp in the displaced state while the drive mechanism is removed and an anchor device is fixed to the band to anchor the band to the base. Then, the clamp is removed.

Abstract: An anchoring device for fixing a structural cable to a building element, the cable comprising a plurality of strands each comprising wires which are themselves enclosed together in a protective sheath, each of the protective sheaths being interrupted at a terminal edge such that the strands have each an exposed end section. The exposed section is inserted in a sealed chamber with a packing box whereof on plate is fixed and the other plate is compressed by threaded rods.

Abstract: The present invention provides a single bore multiple anchorage in which a plurality of unit anchorages (2, 4) are contained in a single bore, the unit anchorages (2, 4) each comprising a tendon (12, 14) having a bond length bonded to the bore grout and a free length, wherein at least one of the tendons comprises a synthetic polymeric material. The ground anchorage means may be made by placing a plurality of unit anchorages in a bore, pouring grout into the bore and stressing each of the tends separately and locking the stressed tendons individually with respect to the anchor head.

Abstract: A modular building system and related methodology wherein extruded, elongate, plastic building components can quickly, and with no special tools or skills, be snapped and slidably fit together to form a wide variety of different building structures. The proposed system produces frameless buildings wherein surface closure structures, like walls, windows, doors and roof panels are bound into stability through building-wrapping banding structures that include upright, perimeter stabilizer bars, roof trusses, and in most instances, the underlying ground. Within a finished building, the closure structures effectively float and react with relative motion responses to different applied building loads.

Abstract: A precast post-tensioned segmental pole system capable of supporting a load is provided. The pole system includes a plurality of pole segments that use connectors and strands to anchor them together. The strands extend within a cavity formed in the pole segments and are external to the wall structure of the pole segments. The strands may be coupled between both of the pole segments, or be anchored to a connector. The connector includes an upper piece that is coupled to one pole segment, and a lower piece that is coupled to the other pole segment. Upper and lower pieces interlock with each other to join the pole segments to one another. The strands are placed in tension so that pole system is capable of withstanding forces imposed by the load.

Abstract: An improved structural reinforcement bar for use in poured concrete construction has an anchorage plate fixed to a rebar body through friction welding. The friction welded rebar body and anchorage plate result in a structural reinforcement bar with improved axially oriented tensile load transfer capabilities having minimal space requirements.

Abstract: An anchorage for a post-tension system including an anchor body having an interior cavity and a generally flat end surface, a tendon extending through the interior cavity of the anchor body, a plurality of wedges in interference-fit relationship between a wall of the interior cavity and a surface of the tendon, a cap member positioned outwardly of the flat end surface, and a ring juxtaposed against the inner surface of the cap member. The ring is physically deformed so as to provide a visual indication of a desired amount of tension applied to the tendon. The ring is received within an annular slot formed in the flat end surface of the anchor body. The ring is physically deformed into the annular slot such that the flat end surface of the cap member is juxtaposed against the flat end surface of the anchor body when tension of greater then 28,000 p.s.i. is applied to the tendon.

Abstract: An apparatus for detensioning prestressed strand, the hollow apparatus being capable of movement along a pre-tensioned strand, thus enabling the protrusion of the apparatus's separation device into the rear portion of the strand chuck barrel's inner conical surface. The preferred embodiment of the apparatus is comprised of an outer housing that includes a first aperture large enough to project over the outer surface of the strand chuck barrel, and a second aperture sized to overlap the housing, thus enabling the positioning of the separation device in close proximity to that of the chuck. The apparatus's attraction member induces separation of the chuck from the strand without manual manipulation, thereby enabling detensioning of the strand.