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20.08.110 <br />Smax =the maximum displacement <br />story drift at Level x. <br />The value of AX need not exceed 3.0. <br />(Ord. 1869 § 2, 2002) <br />20.08.112 Section 1630.8.2.1 - <br />Amended -General: <br />Section 1630.8.2.1 of the California <br />Building Standards Code 2001 Edition <br />(24 CCR), and including by reference <br />the Uniform Building Code, is amended <br />to read as follows: <br />1630.8.2.1 General. Where any por- <br />tion of the lateral-load-resisting <br />system is discontinuous, such as for <br />vertical irregularity Type 4 in Table <br />16-L or plan irregularity Type 4 in <br />Table 16-M, columns, beams, trusses <br />or slabs supporting such discontinu- <br />ous systems shall have the design <br />strength to resist the combination <br />loads resulting from the special seis- <br />mic load combinations of Section <br />1612.4. The Connections of such <br />discontinued elements to the support- <br />ing members shall be adequate to <br />transmit the forces for which the dis- <br />continuous elements were required to <br />be designed. <br />EXCEPTIONS: 1. The quantity E,„ <br />in Section 1612.4 need not exceed <br />the maximum force that can be trans- <br />ferred to the element by the lateral- <br />force-resisting system. <br />2. Concrete slabs supporting light- <br />frame wood shear wall systems or <br />light-frame steel and wood structural <br />panel shear wall systems. <br />For Allowable Stress Design, the <br />design strength may be determined <br />using an allowable stress increase of <br />1.7 and a resistance factor, ~, of 1.0. <br />This increase shall not be combined <br />with the one-third stress increase <br />permitted by Section 1612.3, but may <br />be combined with the duration of <br />load increase permitted in Chapter <br />23, Division III. <br />(Ord. 1869 § 2, 2002) <br />20.08.115 Section 1630.10.2 - <br />Amended -Calculated: <br />Section 1630.10.2 of the California <br />Building Standards Code 2001 Edition <br />(24 CCR), and including by reference <br />the Uniform Building Code, is amended <br />to read as follows: <br />1630.10.2 Calculated. Calculated <br />story drift using DM shall not exceed <br />0.025 times the story height for <br />structures having a fundamental <br />period of less than 0.5 second. For <br />structures having a fundamental <br />period of 0.5 second or greater, the <br />calculated story drift shall not exceed <br />0.020/T ti3 times the story height. <br />EXCEPTIONS: 1. These drift limits <br />may be exceeded when it is demon- <br />strated that greater drift can be toler- <br />ated by both structural elements and <br />nonstructural elements that could <br />affect life safety. The drift used in <br />this assessment shall be based upon <br />the Maximum Inelastic Response <br />Displacement, DM. <br />2. There shall be no drift limit in <br />(Pleasanton April 2003) 704-16 <br />