Patents Assigned to Seismic Structural Design Associates, Inc.
  • Publication number: 20190330873
    Abstract: A method of retrofitting a pre-Northridge type steel beam-to-column connection, includes welding the web of the beam to a flange of the column and slotting the beam web in the region of the connection and near the beam flanges. Stress relief holes are made into the web of the beam and slots are cut into the web of the beam. A top backup bar is welded to the flange of the column and a bottom backup bar is removed from the flange weld to the column. The method includes back gouging the flange of the column at a position of the removed backup bar and welding a bottom flange of the beam to the flange of the column.
    Type: Application
    Filed: April 29, 2019
    Publication date: October 31, 2019
    Applicant: Seismic Structural Design Associates, Inc.
    Inventors: Ralph M. Richard, Clayton J. Allen
  • Patent number: 9353525
    Abstract: A structural framework that includes a column, a beam, a brace beam coupled at an angle to the column and the beam, and a gusset plate to connect the brace beam with the column and the beam. The framework also includes a shear plate with horizontally slotted holes to couple to the column to the beam. The structural framework may also include double framing angles or a flex plate coupled to the gusset plate and to the beam via spacer plates to provide for a semi-rigid connection.
    Type: Grant
    Filed: July 22, 2014
    Date of Patent: May 31, 2016
    Assignee: SEISMIC STRUCTURAL DESIGN ASSOCIATES, INC.
    Inventors: Ralph M. Richard, James E. Partridge, Clayton J. Allen, Rudolph E. Radau
  • Publication number: 20140020311
    Abstract: A structural framework that includes a column, a beam, a brace beam coupled at an angle to the column and the beam, and a gusset plate to connect the brace beam with the column and the beam. The framework also includes a shear plate with horizontally slotted holes to couple to the column to the beam. The structural framework may also include double framing angles or a flex plate coupled to the gusset plate and to the beam via spacer plates to provide for a semi-rigid connection.
    Type: Application
    Filed: February 5, 2013
    Publication date: January 23, 2014
    Applicant: SEISMIC STRUCTURAL DESIGN ASSOCIATES, INC.
    Inventors: Ralph M. RICHARD, James E. Partridge, Clayton J. ALLEN, Rudolph E. RADAU
  • Patent number: 8365476
    Abstract: A structural framework that includes a column, a beam, a brace beam coupled at an angle to the column and the beam, and a gusset plate to connect the brace beam with the column and the beam. The framework also includes a shear plate with horizontally slotted holes to couple to the column to the beam. The structural framework may also include double framing angles or a flex plate coupled to the gusset plate and to the beam via spacer plates to provide for a semi-rigid connection.
    Type: Grant
    Filed: December 23, 2008
    Date of Patent: February 5, 2013
    Assignee: Seismic Structural Design Associates, Inc.
    Inventors: Ralph M. Richard, Rudolph E. Radau, Jr., James E. Partridge, Clayton J. Allen
  • Patent number: 7047695
    Abstract: The present invention provides for improvement of ductility and strength performance of connections in structural steel buildings made typically with rolled structural shapes, specifically in bolted and/or welded beam-to-column connections with welded flanges, by greatly reducing the very significant uneven stress distribution found in the conventionally designed connection at the column/beam weld, through use of slots in column and/or beam webs with or without continuity plates in the area of the column between the column flanges, as well as, optionally, extended shear plate connections with additional columns of bolts for the purpose of reducing the stress concentration factor in the center of the flange welds. Moreover, the slots in beam web adjacent to the beam flanges allow the beam web and flange to buckle independently thereby eliminating the degrading of the beam strength caused by lateral-torsional bucking.
    Type: Grant
    Filed: May 2, 2001
    Date of Patent: May 23, 2006
    Assignee: Seismic Structural Design Associates, Inc.
    Inventors: Clayton J. Allen, James E. Partridge, Ralph M. Richard
  • Patent number: 5680738
    Abstract: The present invention relates to improvement of strength performance of connections in structural steel buildings made typically with rolled structural shapes, specifically in beam-to-column connections made with bolt or riveted weld web connections and welded flanges, to greatly reduce the very significant uneven stress distribution found in the conventionally-designed connection at the column/beam weld, through use of slots in column and/or beam webs with or without continuity plates in the area of the column between the column flanges, as well as, optionally, extended shear connections with additional columns of bolts for the purpose of reducing the stress concentration factor in the center of the flange welds.
    Type: Grant
    Filed: September 1, 1995
    Date of Patent: October 28, 1997
    Assignee: Seismic Structural Design Associates, Inc.
    Inventors: Clayton Jay Allen, James Edward Partridge, Ralph Michael Richard