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Gridline 2 Grade Beam Design <br />To get a realistic grade beam demand, we reduce the elastic base shear by the m-factor of <br />the shear walls, compute the maximum grade beam demand with a model using compression- <br />only soil springs, then scale the resulting demand by the m-factor for shear walls. <br />≔V B S E 1 E 1 27 .4 k i pkipkipkip ≔V B S E 2 E 27 1 .4 k i pkipkipkip <br />≔m I O 1 .7 ≔m LS 3 .8 <br />=――― <br />VB S E 1E <br />m I O <br />7 4 .94 1 k i pkipkipkip =――― <br />VB S E 2E <br />m LS <br />7 1 .42 1 k i pkipkipkip <br />≔V =m a x <br />⎛ <br />⎜ <br />⎝ <br />,――― <br />VB S E 1 E <br />m I O <br />――― <br />V B S E 2E <br />m L S <br />⎞ <br />⎟ <br />⎠ <br />7 4 .9 41 k i pkipkipkip <br />≔M B S E 1E =⋅⋅m I O 2 3 5 k i pkipkipkip f tftftft 39 9.5 ⋅k i pkipkipkip f tftftft <br />≔M B S E 2E =⋅⋅m LS 2 3 5 k i pkipkipkip f tftftft 8 93 ⋅k i pkipkipkip f tftftft <br />≔V u 1E =⋅m I O 1 04 k i pkipkipkip 1 7 6 .8 k i pkipkipkip <br />≔V u 2E =⋅m LS 1 04 k i pkipkipkip 39 5 .2 k i pkipkipkip <br />Bending Capacity Check (32"x24" grade beam with (6) #8 T&B and #5 ties @ 6") <br />38 of 100 <br />1327 S Grand Ave <br />12/12/2024