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. _ _._ .�..�..�.`....�. <br /> structural frame of the building to the ground in such manner as <br /> not to overstress any of the elements thereof. <br /> The overturning moment produced from lateral forces shall in <br /> no case exceed two-thirds of the dead load resisting moment. <br /> Uplift due to overturning shall be adequately resisted by proper <br /> anchorage to the ground or to the structural frame of the building. <br /> The weight of earth superimposed over footings may be used in <br /> determining the dead load resisting moment. Such earth shall be <br /> carefully placed and thoroughly compacted. <br /> �ection 4..2 For the purpose of design, and except for roof <br /> signs, wind pressure shall be taken upon the gross area of the <br /> vertical projec�Lion of all. signs at not less than 15 pounds per <br /> square foot for those portions less than 60 feet above the ground, <br /> and at not less than 20 pounds per square foot for those portions <br /> more than 60 feet above the ground. <br /> Wind pressure upon roof signs and their supports shall be <br /> taken at not less than 30 pounds per square foot of the gross area <br /> of the plane surface acting in any direction for signs whose ex- <br /> treme elevation above ground is 60 feet or more than 20 pounds per <br /> square foot for roof signs whose extreme elevation above the ground <br /> is less than 60 feet. In calculating wind pressure on cylindrical <br /> or spherical signs or sign structures, this pressure shall }�e as- <br /> sumed to act on six-tenths of the projected area. In all open <br /> frame signs the area used in computing wind pressure shall be one <br /> and one-half times the net area of the framing members in the side <br /> exposed to the wind. <br /> Section 4 .3 Signs shall be designed and constructed to <br /> resist seismic forces as provided in the earthquake regulation <br /> Appendix, as adopted by the Redwood City Building Code . <br /> -14- <br />