Abstract: A retrofitting structure includes a column fixed in the ground. A structural fuse is pivotally mounted to the retrofitting structure at two vertically offset locations. The structural fuse is further pivotally mounted at a third location above the column to a superstructure of a building. The structural fuse is designed to yield for loads for which the column only deforms elastically. The structural fuse may be a planar member captured between the column and a retention plate to prevent buckling of the structural fuse. The retention plate may include a channel beam in order to provide sufficient stiffness to prevent buckling. Desired yield properties are obtained by increasing width of the structural fuse with distance from the bottom of the column. The width is augmented with distance from the bottom of the column to account for friction with the column and retention plate.

Abstract: A retrofitting structure includes a column fixed in the ground. A structural fuse is pivotally mounted to the retrofitting structure at two vertically offset locations. The structural fuse is further pivotally mounted at a third location above the column to a superstructure of a building. The structural fuse is designed to yield for loads for which the column only deforms elastically. The structural fuse may be a planar member captured between the column and a retention plate to prevent buckling of the structural fuse. The retention plate may include a channel beam in order to provide sufficient stiffness to prevent buckling. Desired yield properties are obtained by increasing width of the structural fuse with distance from the bottom of the column. The width is augmented with distance from the bottom of the column to account for friction with the column and retention plate.

Abstract: A retrofitting structure includes a column fixed in the ground. A structural fuse is pivotally mounted to the retrofitting structure at two vertically offset locations. The structural fuse is further pivotally mounted at a third location above the column to a superstructure of a building. The structural fuse is designed to yield for loads for which the column only deforms elastically. The structural fuse may be a planar member captured between the column and a retention plate to prevent buckling of the structural fuse. The retention plate may include a channel beam in order to provide sufficient stiffness to prevent buckling. Desired yield properties are obtained by increasing width of the structural fuse with distance from the bottom of the column. The width is augmented with distance from the bottom of the column to account for friction with the column and retention plate.

Abstract: A yield link connection for use in bracing structures against lateral loads connects a first structural member, fixed to a foundation to the structure in need of bracing. The yield link is created by cutting out a portion of material from a standard rolled steel structural section, so the remaining elements of the yield link become separate bending elements with predictable yielding, creating plastic hinge zones around the cutout. Should the yield link need to be replaced after an episodic event, removal of the damaged yield link is easy compared to prior art.

Abstract: A yield link connection for use in bracing structures against lateral loads, the connection comprising a first structural member fixed to a base or foundation, and to which a yield link is connected. The yield link connects the first structural member to the structure in need of bracing. The yield link is created by cutting out a portion of material from a standard rolled steel structural section. The shape and dimensions of the cutout are designed so that the remaining elements of the yield link become separate bending elements. These separate elements behave as fixed-fixed members with predictable yielding, creating four plastic hinge zones around the cutout. High hysteretic damping is achieved through designing the cutout so yielding occurs in a large amount of the steel volume remaining adjacent to the cutout. The cutout is further designed so that yielding occurs in the yield link before it occurs in the first structural member.

Abstract: A yield link connection for use in bracing structures against lateral loads, the connection comprising a first structural member fixed to a base or foundation, and to which a yield link is connected. The yield link connects the first structural member to the structure in need of bracing. The yield link is created by cutting out a portion of material from a standard rolled steel structural section. The shape and dimensions of the cutout are designed so that the remaining elements of the yield link become separate bending elements. These separate elements behave as fixed-fixed members with predictable yielding, creating four plastic hinge zones around the cutout. High hysteretic damping is achieved through designing the cutout so yielding occurs in a large amount of the steel volume remaining adjacent to the cutout. The cutout is further designed so that yielding occurs in the yield link before it occurs in the first structural member.