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≔Rn1 =⋅Fnw β 25.456 ksi Eq.J2-3 <br />=if ⎛ <br />⎝ <br />Rn1 <br />Ω F “ok” “not.ok”⎞ <br />⎠“ok” <br />BASE METAL STRENGTH : <br />Rn2 =⋅0.6 fu 34.8 ksi <br />Eq.J2-2 <br />=if ⎛ <br />⎝ <br />Rn2 <br />Ω F “ok” “not.ok”⎞ <br />⎠“ok” <br />Structural Calculations for L4x4x3/8 Steel Angle Design for Seismic Roof Curb <br />Support <br />(12.5-Ton RTU)17 of 89 <br />3201 S Halladay St <br />5/5/2025