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[SEAOC] Plywood Shear Walls on Metal Studs and lightweight metal roof trusses[Subject Prev][Subject Next][Thread Prev][Thread Next]
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- Subject: [SEAOC] Plywood Shear Walls on Metal Studs and lightweight metal roof trusses
- From: "DW" <wish(--nospam--at)cyberg8t.com>
- Date: Thu, 8 Aug 1996 15:33:04 -0700
I previously reported that a SEAOSC Ad-Hoc committee was issuing a draft for cyclic testing of metal stud walls. This was not quite correct. I received a copy of the current draft this afternoon and provide the following Scope of work as noted on the report. Please note that this is a procedure only - for the cyclic testing of any framed wall system - not limited to wood and steel stud. The report is a current draft only. To obtain a copy, I suggest you contact SEA of Southern California and request the following title dated January 18, 1996 (11 pages total): "Standard Method of Cyclic (Reversed) Load Test for Shear Resistance of Framed Walls for Buildings Based upon ASTM Standard E 564-76 (Reapproved 1984) 1. Scope 1.1 This method is designed to evaluate the shear stiffness and shear strength of a typical section of a framed wall system, including its shear connections and hold-down connectors, under cyclic (reversed) load conditions. 1.2 This method may involve hazardous materials, operations, and equipment. This method does not purport to address all of the safety problems associated with its use. It is the responsibility of whomever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use." Essentially, this is a proposal for establishing testing criteria for any framed shearwall system. Once established and accepted, this criteria can be used to obtain working stress values for various shearwall systems including steel stud and wood frame. What I interpret from this is that there is no conclusive standard for the evaluation of shear wall systems under cyclic (seismic) load. Although the values published by ICBO appear to be the most current allowable stress which we are allowed to use, these are applicable to wood framed systems only. Once the Ad-hoc committee report is approved, appropriate testing can be done by the AISI and other interested proprietary suppliers to determine allowable values for each system. Finally, it appears to me that there are really two choices at the present for the design of plywood shear panels on steel stud. That is: 1. Use the values provided by APA under the research report #154 (John R. Tissell, Structural Panel Shear Walls, APA Tacoma Washington, May 1993) for wind governed loads only. 2. Disallow the use of steel studs with plywood sheathing for designs governed by seismic. The steel stud system may be able to be designed as a braced framed system rather than accounting for the capacity of plywood and screws. 3. Design for alternative shearwall elements. Does this sound reasonable, or is there any other information out there? Finally, are there any standards for the manufacturing of lightweight metal roof trusses to be used on steel stud walls. These would be trusses spaced at 24" on center. You comments are greatly appreciated. Sincerely Dennis S. Wish PE ...
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