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▼ 參考資料
RC部份
#3
拉降壓不降
`X=10.44(cm)=>a=8.874(cm)=>epsilon_s>epsilon_y=>Phi=0.9`
`C_1=42240.24(kgf)`
`C_2=71400(kgf)`
`C_s=23168.42(kgf)`
`M_n=C_1x(68.12-8.874/2)+C_2x(63.12)+C_sx(61.58)`
`M_n=86.23(tf-m)=>M_u=77.61tf-m)`
#4
`W_自重=2400x(0.4x0.6)=576(kgf/m)`
`W_u=1.2xW_D+1.6xW_L=13891.2(kgf/m)`
`V_U=55564.8(kgf)`
`(V_U)_(支承面)=52786.56(kgf)=>V_n=70382(kgf)`
`V_c=18063.56=>V_s=52318.52`
`S=(2800x(1.267x2)x50.92)/52318.52=6.906(cm)`
`S_max=min{d/4,30,(A_v.f_y)/(3.5b_w),(A_v.f_y)/(0.2sqrt(280).b_w)}=12.73(cm)`
`S<S_max ok`
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