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<br />10/27/77R <br /> <br />for earthquakes. <br /> <br />Structural design for major structures <br /> <br />in the longer range period (3/4 of a second or more) shall <br /> <br />use the 'Recommended Base Shear Coefficient 'cs' for <br /> <br />Lateral Force Design,' as shown on Plate V-I, 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). <br /> <br />Foundation systems shall consist of <br /> <br />"Section 9.124 <br /> <br />mat, grill, piles or a similar system with a demonstrated <br /> <br />ability to resist differential settlement and for tying the <br /> <br />foundation elements together. <br /> <br />The minimum tie strength shall <br /> <br />be at least 10% of the greatest load imposed on a foundation <br /> <br />or foundation element. <br /> <br />All wood frame buildings shall be <br /> <br />"Section 9.125 <br /> <br />provided with 5/16" plywood sheathing on the exterior frame <br /> <br />in accordance with the 'Design Criteria' prescribed by <br /> <br />Section 9.122 herein unless structural design and calculations <br /> <br />prescribe lateral force parameters equal to or greater than <br /> <br />the 'Design Criteria Recommendations' of Section 9.122. <br /> <br />'Frame only' <br /> <br />(space frame-ductile <br /> <br />"Section 9.126 <br /> <br />moment resisting and space frame-moment resisting as per the <br /> <br />Building Code) structures where K =0.67 are not permitted. <br /> <br />Shear walls or braced frames are required to resist the <br /> <br />entire lateral load. <br /> <br />In buildings of more than 160 ft. in <br /> <br />height a moment resisting ductile frame is required; this <br /> <br />frame shall be capable of resisting 25% of the required <br /> <br />lateral load. <br /> <br />Unit masonry structures (concrete block, <br /> <br />"Section 9.127 <br /> <br />brick, unitized pre-case, pre-stressed concrete) are not <br /> <br />-10- <br />