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<br />'" (f) Flat Slabs. Top and bottom reinforcing <br />shall be provided in the column strips, continuous <br />throughout their length. The minimum reinforcement <br />shall be at least 25% of the maximum negative <br />reinforcement. This minimum reinforcement shall be <br />provided in both top and bottom of the slab. Laps <br />at interior columns and anchorage at exterior <br />supports for this reinforcement shall be as <br />required in sub-paragraph (b) above.' <br /> <br />"Section 9.131 <br /> <br />In addition to the provisions set forth <br /> <br />in Section 2618 (i) of the Building Code relating to pre- <br /> <br />stressed concrete, the following provisions shall be applicable: <br /> <br />"'Vertical Acceleration: Pre-stressed concrete slabs, <br />beams, girders, trusses, and similar horizontal <br />framing members shall be proportioned to resist, at <br />ultimate strength, the effect of vertical seismic <br />excitation sufficient to relieve the member of 50% <br />of its gravity loads. For single span members the <br />gravity load to be considered shall be the dead load <br />only. For multiple span members the gravity load <br />shall be the dead load plus live load placed for <br />maximum adverse effect. The vertical seismic effects <br />considered in this paragraph are applicable to <br />individual members and their supports. They need <br />not be carried into the structure as a whole and <br />need not be combined with the horizontal seismic <br />or wind loads specified elsewhere in this Code.' <br /> <br />Division III <br /> <br />Redwood City Generally <br /> <br />"Section 9.135 <br /> <br />The provisions of this division shall <br /> <br />be applicable throughout Redwood City and shall be in addition <br /> <br />to all other applicable provisions of the Building Code. <br /> <br />Whenever connected to, part of, or housed <br /> <br />"Section 9.136 <br /> <br />within a building or structure, towers, tanks, storage-type <br /> <br />water heaters, lighting fixtures, power transformers, <br /> <br />machinery or other equipment that would constitute or <br /> <br />contribute to earthquake hazards shall be securely anchored <br /> <br />in accordance with Table 23J, Item 4 of the Building <br /> <br />Code. <br /> <br />Exception: <br /> <br />Domestic storage-type water heaters <br /> <br />installed in one and two story residential buildings shall <br /> <br />be anchored as recommended in the 'Design Criteria' referenced <br /> <br />-13- <br />