Chapters 16 and 16A Structural Design
Chapter 16 – Structural Design
Office of Statewide Hospital Planning and Development
1601.1.5 Additional amendments [OSHPD 1R, 2 & 5]
Updated pointer references to applicable sections for additional requirements in Chapter 16A.
Table 1604.5 Risk category of buildings and other structures
Amended the table to indicate I-2 occupancies for risk category IV for OSHPD 2 & 5 is not adopted by OSHPD. I-2 occupancies are addressed in Table 1604.5A.
Table 1613.2.3(1) and Table 1613.2.3(2) Values of site coefficients Fa and Fv
Deleted both model code tables and associated footnotes. Changes to ASCE 7 standards have rendered OSHPD amendments obsolete for site-specific ground motions and calculation of acceleration parameters.
Division of the State Architect
1617 Additional requirements for community colleges [DSA-SS/CC]
1617.2.1.4 Analysis
Repealed amendment requiring analysis to explicitly include consideration of stiffness of diaphragms.
1617.2.4 Photovoltaic (PV) panel systems
Amended to require elevated PV structures to be assigned the same risk category that relates to the use underneath.
1617.3.1 Stability
Repealed amendment regarding strength design for foundation geotechnical capacity using a resistance factor of 1.0 since this is adequately covered by requiring factor of safety for soil bearing values to be no less than the overstrength factor of the structures supported.
1617.3.3 Modifications to load combinations in ICC 300
Repealed amendment for modification to ICC 300, Section 303.5.2 since it is now addressed in ICC 300-23. The modification to ICC 300, Section 303.5.3 has been relocated to Section 1605A.3.1, and the reference to equation numbers has been updated to match the 2023 edition for ICC 300.
1617.8.1 Lateral pressures
Revised section for lateral pressures to make it consistent with Sections 1807A.1.1 and 1807A.2.2. Added a note to clarify that lateral soil pressure for design of foundation and retaining walls shall be based on the geotechnical report.
1617.11.4 (formerly ASCE 7, Section 12.2.3, 12.2.3.1, and 12.2.3.2)
Repeal amendments for two-stage analysis procedure which are adequately addressed in ASCE 7-22.
1617.12.6 (formerly 1617.11.9) ASCE 7, Section 12.3.3.1
Repealed all language related to the extreme torsional irregularities. Revised to align with ASCE 7-22. Retain amendment for prohibition of vertical irregularities Type 1b, 4a and 4b for SDC D.
1617.12.8 ASCE 7, Section 12.10.2.1
Added an amendment to clarify that the exemption from load combinations with overstrength factor only applies to light-frame construction braced entirely by wood light-frame construction, including diaphragms and shear walls.
1617.12.10 ASCE 7, Section 12.13.5.2
Added to modify the resistance factor for the in-situ prototype ASCE 7 testing program to align with American Association of State Highway and Transportation Officials, Bridge Design Standard (AASHTO 2020). Revised the resistance factor to align with reduced test requirements in Chapters 18 & 18A.
1617.12.12 (formerly 1617.11.15) ASCE 7, Section 13.1.4
Added requirements for Item 8 regarding distribution systems to align with OSHPD and re-organization of ASCE 7. Revised Exemptions 1-3 to clarify which items may be excluded from design and detailing. New amendment language for Item 7 regarding cabinets that could fall and block a required means of egress.
1617.12.16 (formerly 1617.11.19) ASCE 7, Section 13.6.7.3
Deleted reference to Rp value (used in ASCE 7-16) because ASCE 7-22 does not use it and separation of pipe and support seismic coefficient in ASCE 7-22 Table 13.6-1 makes it unnecessary. Clarified language regarding pipe supports.
Chapter 16A – Structural Design
Division of the State Architect and
Office of Statewide Hospital Planning and Development
Updates, clarifications and revisions to ASCE 7 standards; Horizontal and Vertical Irregularities for Seismic Design Categories; Provisions for piping and tubing systems.
1604A.4 Analysis
Repealed amendment requiring analysis to explicitly include consideration of stiffness of diaphragms.
1605A.3 Modifications to load combinations in ICC 300
Repealed amendment for modification to ICC 300, Section 303.5.2 since it is now addressed in ICC 300-23. The modification to ICC 300, Section 303.5.3 has been relocated to Section 1605A.3.1, and the reference to equation numbers has been updated to match the 2023 edition for ICC 300.
1610A.1 Lateral pressures
Revised section for lateral pressures to make it consistent with Sections 1807A.1.1 and 1807A.2.2. Added a note to clarify that lateral soil pressure for design of foundation and retaining walls shall be based on the geotechnical report.
1617A.1.3 Reserved (formerly ASCE 7 Section 11.4)
Repealed and reserved. Repeal amendment for seismic ground motion values based on ASCE 7-16 Supplement 3, which are adequately addressed in ASCE 7-22.
1617A.1.5 Reserved (formerly ASCE 7 Section 12.2.3, 12.2.3.1, and 12.2.3.2)
Repealed and reserved. Repeal amendments for two-stage analysis procedure which are adequately addressed in ASCE 7-22.
1617A.1.10 ASCE 7 Section 12.3.3.1
Repealed all language related to the extreme torsional irregularities. Revised to align with ASCE 7-22. Retain amendment for prohibition of vertical irregularities Type 1b, 4a and 4b for SDC D and higher.
1617A.1.12 ASCE 7 Section 12.10.2.1 (formerly Reserved)
Added an amendment to clarify that the exemption from load combinations with overstrength factor only applies to light-frame construction braced entirely by wood light-frame construction, including diaphragms and shear walls.
1617A.1.13 ASCE 7, Section 12.13.5.2. (formerly Reserved)
Added to modify the resistance factor for the in-situ prototype ASCE 7 testing program to align with American Association of State Highway and Transportation Officials, Bridge Design Standard (AASHTO 2020). Revised the resistance factor to align with reduced test requirements in Chapters 18 & 18A.
1617A.1.19 ASCE 7 Section 13.4
Added prohibition of the removal and resetting of post-installed mechanical anchors (American Concrete Institute (ACI) 318 Section 17.1.3). Repealed a separate prohibition for screw anchors. Added a note to indicate that the removal and resetting of post-installed mechanical anchors is prohibited by ACI 318.
1617A.1.26 ASCE 7 Section 13.6.7.3.
Deleted reference to Rp value (used in ASCE 7-16) because ASCE 7-22 does not use it and separation of pipe and support seismic coefficient in ASCE 7-22 Table 13.6-1 makes it unnecessary. Clarified language regarding pipe supports.
Office of Statewide Hospital Planning and Development
1607A.14.3.5 Ballasted photovoltaic panel system [OSHPD 1 & 4]
Clarified that ballasted photovoltaic panel systems are considered as an alternative system.
1617A.1.1 ASCE 7 Section 1.3
Added additonal peer review requirements for wind tunnel test based recommendations.
1617A.1.3 Reserved (formerly ASCE 7 Section 11.4)
Repealed and reserved. Repealed use of 2020 NEHRP provisions for multi period spectra as these are now incorporated in ASCE 7-22.
1617A.1.14 Reserved (formerly ASCE 7 Section 12.12.3 [OSHPD 1 & 4])
Repealed and reserved.
1617A.1.4 ASCE 7 Table 12.2-1
Changed some item numbers and names for the seismic force-resisting systems to align with ASCE 7-22. Permitted steel intermediate and ordinary moment frames for lightly loaded canopies and walkways. Repealed reference to ASCE content in amendment to existing Section 1617A.1.4.
1617A.1.21 ASCE 7 Section 13.5.6.2
Revised to add Item 6, a prescriptive provision with reduced hanger spacing for aluminum ceiling grid, with a banner for OSHPD 1 & 4. Continued permitting tested aluminum that complies with ASTM E580.
1617A.1.23 ASCE 7, Section 13.6.2.1
Added banner for OSHPD 1 & 4. Corrected section reference pointer to indicate section 1705A.14.3 of this code. Deleted amendments to ASCE 7 Tables 13.5-1 and 13.6-1 due to their revision by the model code developer.
1617A.1.38 ASCE 7 Section 20.3 [OSHPD 1 & 4]
Added section regarding limitation of shear wave velocity for new large buildings. Amendment only applies to new buildings larger than 4,000 square feet ground floor area, and will not impact existing building projects.
Division of the State Architect
1604A.5.2 Photovoltaic (PV) panel systems
Amended to require elevated PV structures to be assigned the same risk category that relates to the use underneath.
1605A.1.1 Stability
Repealed amendment regarding strength design for foundation geotechnical capacity using a resistance factor of 1.0 since this is adequately covered by requiring factor of safety for soil bearing values to be no less than the overstrength factor of the structures supported.
1617A.1.18 ASCE 7, Section 13.1.4
Added requirements for Item 10 regarding distribution systems to align with OSHPD and re-organization of ASCE 7. Revised Exemptions 1-3 to clarify which items may be excluded from design and detailing. New amendment language for Item 9 regarding cabinets that could fall and block a required means of egress.