This article provides background on the seismic design of cross-laminated timber (CLT) shear wall systems following ASCE 7-22 Minimum Design Loads and Associated Criteria for Buildings and Other Structures and ANSI/AWC Special Design Provisions for Wind and Seismic (SDPWS) 2021 Edition. The SDPWS is referenced in the 2021 International Building Code (IBC), and both SDPWS and ASCE 7-22 will be referenced in the 2024 IBC.
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Author Archives : Philip Line, P.E.
Philip Line is Vice President of Codes & Regulations for the American Wood Council, Leesburg, VA.
Revised Component and Cladding (C&C) wind load provisions in ASCE 7-22, Minimum Design Loads and Associated Criteria for Buildings and Other Structures, produce in most cases either the same or slightly lower pressures than would occur under the prior edition while also preserving the extensive wind tunnel testing basis of the ASCE 7-16 C&C wind provisions.
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The 2021 Edition of Special Design Provisions for Wind and Seismic (SDPWS) was approved as an American National Standard on July 22, 2020, with the designation ANSI/AWC SDPWS-2021 (Figure 1). The 2021 SDPWS was developed by the American Wood Council’s (AWC’s) Wood Design Standards Committee (WDSC) and contains provisions for the design of wood members, fasteners, and assemblies to resist wind and seismic forces. Notable revisions are summarized below (also see Table 1 online for a summary of changes by Chapter):
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Determining Components and Cladding Roof Design Pressures
Component and cladding (C&C) roof pressures changed significantly in ASCE 7-16, Minimum Design Loads and Associated Criteria for Buildings and Other Structures. For flat roofs, the corner zones changed to an ‘L’ shape with zone widths based on the mean roof height and an additional edge zone was added. …
ASCE 7-16 Revised Capping Provision for Short Period Regular Structures
Design forces for short period, regular structures, five stories and less in height, in high seismic hazard areas, are permitted to be designed for less seismic force than would otherwise be required by use of the mapped ground motion parameters. …
The 2018 Edition of the Wood Frame Construction Manual (WFCM) for One- and Two-Family Dwellings, designated ANSI/AWC WFCM-2018, is approved as an ANSI American National Standard (Figure 1). The 2018 WFCM was developed by the American Wood Council’s (AWC) Wood Design Standards Committee (WDSC) and is referenced in the 2018 International Residential Code (IRC) and 2018 International Building Code (IBC). …
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The 2018 Edition of the National Design Specification® (NDS®) for Wood Construction was recently published. The updated standard, designated ANSI/AWC NDS-2018, was approved as an ANSI American National Standard on November 30, 2017 (Figure 1). …
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The 2015 Edition of Special Design Provisions for Wind and Seismic (SDPWS) was approved as an American National Standard on September 8, 2014, with the designation ANSI/AWC SDPWS-2015 (Figure 1). The 2015 SDPWS was developed by AWC’s Wood Design Standards Committee (WDSC) and contains provisions for design of wood members, fasteners, and assemblies to resist wind and seismic forces. …
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The Wood Frame Construction Manual (WFCM) for One- and Two-Family Dwellings was updated and is designated ANSI/AWC WFCM-2012 (Figure 1). The 2012 WFCM was developed by the American Wood Council’s (AWC) Wood Design Standards Committee and is referenced in the 2012 International Residential Code (IRC) and 2012 International Building Code (IBC). …
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