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Section 1630.7 of the California Building Standards Code 2001 <br /> Edition (24 C.C.R.), and including by reference the <br /> Uniform Building Code, is amended to read as follows: <br /> <br />1630.7 Horizontal Torsional Moments. Provisions shall <br />be made for the increased shears resulting from horizontal <br />torsion where diaphragms are not flexible. The most severe <br />load combination for each element shall be considered for <br />design. <br /> <br />The torsional design moment at a given story shall be the <br />moment resulting from eccentricities between applied <br />design lateral forces at levels above that story and the <br />vertical-resisting elements in that story plus an accidental <br />torsion. <br /> <br />The accidental torsional moment shall be determined by <br />assuming the mass is displaced as required by Section <br />1630.6. <br /> <br />Where torsional irregularity exists, as defined in Table 16- <br />M, the effects shall be accounted for by increasing the <br />accidental torsion at each level by an amplification factor, <br />Ax, determined from the following formula: <br /> Ax=[ 8max 12 (30-16) <br /> l1.2~avg / <br />WHERE: <br />6avg = the average of the story dri~at the extreme points of <br />the structure at Level x. <br />Jmax = the maximum displacement story driP_at Level x. <br />The value orax need not exceed 3.0. <br /> <br />Section 20.08.112 Section 1630.8.2.1 - amended - General <br /> <br />Section 1630.8.2.1 of the California Building Standards Code 2001 <br /> Edition (24 C.C.R.), and including by reference the Uniform <br /> Building Code, is amended to read as follows: <br /> <br />1630.8.2.1 General. Where any portion of the lateral-load- <br />resisting system is discontinuous, such as for vertical <br />irregularity Type 4 in Table 16-L or plan irregularity Type <br />4 in Table 16-M, columns, beams, trusses or slabs <br /> 42 <br /> <br /> <br />