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WHERE: <br /> ~Savg = the average of the story drift at the extreme points of the structure at <br /> Level x. <br /> ~max = the maximum displacement story drift at Level x. <br /> The value of Ax need not exceed 3.0." <br /> <br /> Sec. 9.68 SECTION 1630.8.2 OF THE BUILDING CODE AMENDED: Section <br />1630.8.2 of the Building Code is hereby amended to read as follows: <br /> <br /> Section 1630.8.2.1 General. Where any portion of the lateral-load-resisting <br /> system is discontinuous, such as for vertical irregularity Type 4 in Table 16-L or <br /> plan irregularity Type 4 in Table 16-M, columns, beams, trusses or slabs <br /> supporting such discontinuous systems shall have the design strength to resist <br /> the combination loads resulting from the special seismic load combinations of <br /> Section 1612.4. The connections of such discontinued elements to the <br /> supporting members shall be adequate to transmit the forces for which the <br /> discontinuous elements were required to be designed. <br /> <br /> EXCEPTIONS: <br /> <br /> 1. The quantity Em in Section 1612.4 need not exceed the maximum force than <br /> can be transferred to the element by the lateral-force-resisting system. <br /> <br /> 2. Concrete slabs supporting light-frame wood shear wall systems or light-frame <br /> steel and wood structural panel shear wall systems. <br /> <br /> For Allowable Stress Design, the design may be determined using an allowable <br /> stress increase of 1.7 and a resistance factor, q), of 1.0. This increase shall not <br /> be combined with the one-third stress increase permitted by Section 1612.3, by <br /> may be combined with the duration of load increase permitted in Chapter 23. <br /> Division III. <br /> <br /> Section 1630.8.2.2 Detailing requirements in Seismic Zones 3 and 4. In Seismic <br /> Zones 3 and 4, elements supporting discontinuous systems shall meet the <br /> following detailing or member limitations: <br /> <br /> 1. Reinforced concrete or reinforced masonry elements designed primarily as <br /> axial-load members shall comply with Section 1921.4.4.5. <br /> <br /> 2. Reinforced concrete elements designed primarily as flexural members and <br /> supporting other than light-frame wood shear wall systems or light-frame steel <br /> and wood structural panel shear wall systems shall comply with Sections <br /> 1921.3.2 and 1921.3.3. Strength computations for portions of slabs designed as <br /> supporting elements shall include only those portions of the slab that comply with <br /> the requirements of these Sections. <br /> <br />Atty/Ord/Ord. 167 <br />102402 9 <br /> <br /> 2241 <br /> <br /> <br />