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DAVID CHOI AND ASSOCIATES, INC. <br />STRUCTURAL ENGINEERS <br />1327 LOMA AVENUE LONG BEACH, CA 90804 <br />TEL· 562.382.8040 <br />October 15, 2018 ECEIVE <br />OCT 22 2018 <br />Leonard Joseph <br />707 Wilshire Blvd. Suite 4450 <br />Los Angeles, CA City of Santa Ana <br />Subject:888 North Main Alternative Seismic Retrofit <br />Building Department Calculations <br />Project No. S18003.01 <br />DCA Job Reference No: 18-240 <br />Dear Client; <br />DCA has completed its peer review of the retrofit calculations and details provided by Thornton <br />Tomasetti for the address named above. We are presenting our conclusions about the design approach <br />and solutions specified in the documents listed below. <br />List of Documents Reviewed <br />1) 888 Main Review - 2018.09.20 - Peer Review Comments 1 Responses.pdf <br />2) 20181004 888 N Main exec summary proposed alternative method steps. pdf <br />3) Bldg Dept Updated Dwg Submittal dated 20181004 flattened.pdf <br />4) Building Department Calculation Report - Resubmission.pdf <br />Project Description <br />The project site is an existing 10-story concrete frame structure with double-height ground floor, and a <br />basement. As requested by the city of Santa Anna Building and Safety Division, the structure will be <br />evaluated per the requirements of ASCE 41 - 13. The chosen method of seismic retrofit will be viscous <br />dampeners added between the frame columns. <br />Review Summary <br />After a preliminary review, a list of plan check items was created by DCA and delivered to Thornton <br />Tomasetti. Responses to the plan check list were provided, and a revised calculation report was <br />lol 16 9-1 1 <br />CP