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Structural Calculations for L4x4x3/8 Steel Angle Design for Seismic Roof Curb <br />Support <br />(12.5-Ton RTU) <br />≔WRTU 25000 lbf RTU Weight <br />≔H 5 ft RTU Height <br />≔W 4.5 ft RTU Width <br />≔I 1 Importance Factor <br />SDS 1.15 <br />R 3 <br />Cs =――SDS <br />―R <br />I <br />0.383 Seismic Response Coefficient <br />Seismic Base Shear <br />18 of 89 <br />3201 S Halladay St <br />5/5/2025