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22.10.1- Structures assigned to Seismic Design Category C, D, E or F shall not have <br />elements of structural plain concrete, except as follows: <br />(a) Isolated footings of plain concrete supporting pedestals or columns are permitted, <br />provided the projection of the footing beyond the face of the supported member does <br />not exceed the footing thickness. <br />Exception: In detached one and two - family dwelling three stories or less in height, <br />the projection of the footing beyond the face of the supported member is permitted to <br />exceed the footing thickness. <br />(b) Plain concrete footing supporting walls are permitted, provided the footings have at <br />least two continuous longitudinal reinforcing bars. Bars shall not be smaller than No. <br />4 and shall have a total area of not less than 0.002 times the gross cross - sectional area <br />of the footing. A minimum of one bar shall be provided at the top and bottom of the <br />footing. Continuity of reinforcement shall be provided at corners and intersections. <br />Exception: In detached one and two- family dwellings three stores or less in height <br />and constructed with stud bearing walls, plain concrete footings -with at least two <br />continuous longitudinal reinforcing bars not smaller than No. 4 are permitted to have <br />a total area of less than 0.002 times the gross cross sectional area of the footing. <br />Sections 1908.1.11 through 1908.1.14 are added as follows: <br />1908.1.11 ACI 318, Section 21.6.4.1. Modify ACI 318, Section 21.6.4.1, to read as follows: <br />Where the calculated point of contraflexure is not within the middle half of the member <br />clear height, provide transverse reinforcement as specified in ACI 318 Sections 21.6.4.1, <br />Items (a) through (c), over the full height of the member. <br />1908.1.12 ACI 318, Section 21.6.4. Modify ACI 318, Section 21.6.4, by adding Section 21.6.4.8 <br />to read as follows: <br />21.6.4.8 — At any section where the design strength, 9P,,, of the column is less than the <br />sum of the shears V computed in accordance with ACI 318 Sections 21.5.4.1 and <br />21.6.5.1 for all the beams framing into the column above the level under consideration, <br />transverse reinforcement as specified in ACI 318 Sections 21.6.4.1 through 21.6.4.3 shall <br />be provided. For beams framing into opposite sides of the column, the moment <br />components may be assumed to be of opposite sign. For the determination of the design <br />strength, cpP,,, of the column, these moments may be assumed to result from the <br />deformation of the frame in any one principal axis. <br />1908.1.13 ACI 318, Section 21.9.4. Modify ACI 318, Section 21.9.4, by adding Section 21.9.4.6 <br />to read as follows: <br />ORDINANCE NO. 2010-013 26 <br />