AISI-Specifications for the Design of Cold-Formed Steel Structural Members

Alternative Title

Final report: LGSRG-06-02

Keywords and Phrases

Shear; Walls; OSB; Sheet; Steel; Cyclic; Monotonic; Cold-formed; Gypsum; Wallboard; Sheathing

Abstract

This report presents the results of twenty shear wall tests that were conducted to evaluate the performance of wall configurations not currently (2002) permitted in the building codes. Ten (10) walls were evaluated under reversed cyclic loading and the other ten (10) under monotonic loading. Brief descriptions of the test program and results are presented in the following paragraphs. The reversed cyclic load tests comprised 4 ft. x 8 ft. 54- and 68-mil framed walls with 7/16-in. OSB rated sheathing on one or both sides of the wall and 33-mil framed walls with 27-mil sheet steel. The sheet steel wall incorporated a horizontal lap shear joint at the wall midheight. The monotonic tests focused exclusively on 8 ft. x 8 ft. gypsum sheathed shear walls with an unblocked configuration, except for two tests. Overall, the OSB tests showed that the No. 8 screws in 54-mil framing and No. 10 screws on 68-mil framing permitted a ductile mode of failure at the connection. In the doubled-sided (sheathing each side) wall tests, the load demands on the 54-mil chord studs exceeded the capacity of studs and the load demands at the holdown attachment to the 68-mil chords studs exceeded the capacity of the screws. As a result, the capacity of the double-sided wall was less than twice the capacity of the single-sided wall. In the sheet steel walls, shear buckling accompanied by diagonal tension resulted in high demands on a few screws at the mid-height joint which caused the panel to unzip prematurely along the joint. Failure in the GWB monotonic tests was characterized by breaking of the wallboard at the location of the fasteners along the “un-papered” edges and screw pull-through along the “papered” edges of the wallboard.

Department(s)

Civil, Architectural and Environmental Engineering

Research Center/Laboratory(s)

AISI - Specifications for the Design of Cold-Formed Steel Structural Members
Wei-Wen Yu Center for Cold-Formed Steel Structures

Sponsor(s)

American Iron and Steel Institute

Publisher

Department of Civil Engineering, Santa Clara University

Publication Date

6-1-2002

Document Version

Final Version

Rights

© 2002 Department of Civil Engineering, Santa Clara University, All rights reserved.

Document Type

Report - Technical

File Type

text

Language

English


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