ORD 1869 - Laserfiche WebLink

Section 1630.2.3.4 of the California Building Standards Code 2001 Edition (24 C.C.R.), and including by reference the Uniform Building Code is amended to read as follows: 1630.2.3.4 Horizontal Distribution. Diaphragms constructed of untopped steel decking or wood structural panels or similar light-frame construction are permitted to be considered as flexible. Section 20.08.109 Section 1630.4.2 - amended - Vertical combinations Section 1630.4.2 of the California Building Standards Code 2001 Edition (24 C.C.R.), and including by reference the Uniform Building Code, is amended to read as follows: 1630.4.2 Vertical combinations. The value of R used in the design of any story shall be less than or equal to the value orR used in the given direction for the story above. EXCEPTION: This requirement need not be applied to a story where the dead weight above that story is less than 10 percent of the total dead weight of the structure. Structures may be designed using the procedures of this section under the following conditions: 1. The entire structure is designed using the lowest R of the lateral-force-resisting systems used, or 2. The following two-stage static analysis procedures may be used for structures conforming to Section 1629.8.3, Item 4. 2.1 The flexible upper portion shall be designed as a separate structure, supported laterally by the rigid lower portion, using the appropriate values orR and p. 2.2 The rigid lower portion shall be designed as a separate structure using the appropriate values of R and p. The reactions from the upper portion shall be those determined from the analysis of the upper portion multiplied by the ratio of the (R/p) of the upper portion over (R/p) of the lower portion. This ratio shall not be taken less than 1.0. Section 20.08.110 Section 1630.7 - amended - Horizontal Torsional Moments 41