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ORDINANCE NO. NS- 1598 <br />Page Seven <br /> <br />(g) COMBINATION OF LOAD EFFECTS. <br /> <br /> (1) NEW MATERIALS. Combination of load effects <br />shall conform to the Uniform Building Code for all new <br />materials introduced into the building structure to meet the <br />requirements of this section. <br /> <br /> (2) EXISTING MATERIALS. When stress in existing <br />lateral force resisting elements is due to a combination of <br />dead loads plus live loads plus seismic loads, the allowable <br />working stress specified in the Code may be increased one <br />hundred (100) percent. However, no increase shall be permitted <br />in the stresses allowed in Section 8-2006 of this article <br />and the stresses in members due only to seismic and dead <br />loads shall not exceed the values permitted by Chapter 23 of <br />the Uniform Building Code. <br /> <br /> (3) ALLOWABLE REDUCTION OF BENDING STRESS BY <br />VERTICAL LOAD. In calculating maximum tensile stress due to <br />earthquake forces, the maximum tensile fiber stresses may be <br />reduced by not more than one hundred (100) percent of the <br />direct stress due to vertical dead loads. <br /> <br />SECTION 5: That Section 8-2002 of the Santa Ana Municipal <br />Code, is hereby amended to read as follows: <br /> <br />SEC. 8-2006. MATERIALS OF CONSTRUCTION <br /> <br /> (a) GENERAL. Ail materials permitted by this Code <br />including their appropriate allowable stresses and those <br />existing configurations of materials specified herein may be <br />utilized to meet the requirements of this article. <br /> <br />(b) EXISTING MATERIALS. <br /> <br /> (1) UNREINFORCED MASONRY WALLS. Unreinforced <br />masonry walls analyzed in accordance with this section may <br />provide vertical support for roof and floor construction and <br />resistance to lateral loads. <br /> <br /> Tension stresses due to seismic forces normal to <br />the wall may be neglected if the wall does not exceed the <br />height or length to thickness ratio and the in-plane shear <br />stresses due to seismic loads as set forth in Table D. <br /> <br /> TABLE D <br /> ALLOWABLE VALUE OF <br />UNREINFORCED MASONRY WALLS ,~, <br />WITH MINIMUM QUALITY MORTAR~£; <br /> <br />RATING <br />CLASSIFICATION <br /> <br /> MAXIMUM RATIO <br />UNSUPPORTED <br />HEIGHT OR LENG~ <br /> To THICKNESS--' <br /> <br />I Not applicable(2) <br />II 9 <br />III 10 <br />IV 12 <br /> <br /> SEISMIC IN-PLANE <br />SHEAR STRESS <br />BASED ON GROSS AREA <br /> <br />Not applicable (2) <br /> 3 psi (3) <br /> 3 psi (3) <br /> 3 psi (3) <br /> <br /> <br />