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<br />10/27/77R <br /> <br />permitted unless the project design engineer can demonstrate, <br /> <br />by thorough analysis and/or tests, that the strength and <br /> <br />ductility (including the effects of temperature, foundation <br /> <br />settlement, shrinkage and creep) are equal to that of <br /> <br />monolithic construction. <br /> <br />"Section 9.128 <br /> <br />For all structures more than four (4) <br /> <br />stories irrespective of height or which contain more than <br /> <br />20,000 square feet of floor area, the design shall incorporate <br /> <br />sufficient elements of redundancy such that complete failure <br /> <br />of anyone bracing element will not reduce the bracing <br /> <br />capacity of the structures by more than 75%. <br /> <br />The design of buildings or structures <br /> <br />"Section 9.129 <br /> <br />more than six (6) stories must irrespective of height, be <br /> <br />based on a response spectrum computed for the site. <br /> <br />This <br /> <br />response spectrum shall be compared with the average spectrum <br /> <br />in accordance with Plate v-I 'Recommended Base Shear <br /> <br />Coefficients 'CS' for Lateral Force Design,' as revised <br /> <br />10/6/77, following page 75A, 1972 Seismic Advisory Board <br /> <br />Report (on file in the office of the City Clerk) and the <br /> <br />higher valued spectrum incorporated in the design. <br /> <br />"Section 9.130 <br /> <br />In addition to the provisions specified <br /> <br />by Section 2610 (f) of the Building Code, the following <br /> <br />requirements shall be applicable. <br /> <br />'" (a) Minimum Reinforcement of Flexural Sections: <br />At any section of a flexural member (except slabs <br />of uniform thickness) where positive reinforcement <br />is required by analysis, the ratio p supplied shall <br />not be less than that give by <br />200 <br /> <br />= fy <br /> <br />Pmin <br /> <br />(Equation 10-1, 1976 U.B.C.) <br /> <br />-11- <br />