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Loyd W. Martin Solar Structures Engineering <br />2510 W. 237th St. #206 Torrance, CA 90505 Tel:1.310.464.1804 <br />Email: loydwmartin@gmail.com www.loydwmartin.com <br />EXISTING BASE SHEAR <br />V = 0.154 x 51,000 LBS = 7,854 LBS EQ'N 12.8-1 ASCE 7-10 <br />DETERMINE NEW BASE SHEAR <br />Determine Seismic Weight of Building with Solar Array: <br />EXISTING <br />SEISMIC =51,000 LBS <br />WEIGHT <br />NEW SOLAR <br />ARRAY =3 PSF x 12 PANELS x 3.3' x 5.5'= 653 LBS <br />NEW <br />SEISMIC =51,000 LBS + 653 LBS = 51,653 LBS <br />WEIGHT <br />THEREFORE NEW BASE SHEAR: <br />V = 0.154 x 51,653 = 7,955 LBS EQ'N 12.8-1 ASCE 7-10 <br />7,955 LBS - 7,854 LBS <br />% CHANGE = <br />7,854 LBS <br />x 100 =1.3 % < 10% OK <br />OK. PER ASCE 7-10 SECTION 11.B.4 ALTERATIONS <br />EXISTING LATERAL FORCE RESISTING SYSTEM IS EXEMPT <br />FROM ANALYSIS SINCE NEW SEISMIC FORCE IS <br />LESS THAN 10% GREATER THAN EXISTING SEISMIC FORCE. <br />"Alterations are permitted to be made to any structure without requiring the <br />existing structure to comply with this standard provided the alterations comply <br />with the requirements for a new structure. Alterations that increase the <br />seismic force in any existing structural element by more than 10 percent or <br />decrease the design strength of any existing structural element to resist <br />seismic forces by more than 10 percent shall not be permitted unless the <br />entire seismic force-resisting system is determined to comply with this <br />standard for a new structure." <br />%\ 1 <br />22 No. C58724 St <br />* Exp. 3-31-15 * <br />d> C/V\L422 OF C A\.FCr <br />End of Calculations <br />2014- 755 Nexus Energy Sylvina Cornejo Residence <br />Sht # 6 of 6 <br />Date: May 16, 2014 <br />.