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American Tunnel bu.LKheads #2 & #3 Page lb January 15, 2001 <br /> Appendix A. American Tunnel Bulkhead #2 design calculations (Continued) <br /> As= 2.036 ft Steel area required to resist maximum credible earthquake loading for <br /> 10-ft thick Bulkhead #2 on the outbye (downstream) side of the bulkhead. <br /> #10 bars on 6-in c-c provide 2.540 a steel area (required for flexural bending at <br /> downstream face) <br /> Check for adequacy <br /> Allowable M„Q =—58,800A2 +6,990,OOOAS = 17,370,000 in•lb <br /> Design earthquake M. = 13,990,OOOin•lb <br /> FS = 173700009WOO = 1.204 for the outbye (downstream) side of the 10-ft thick Bulkhead #2 <br /> under maximum earthquake loading <br />