发布于:2014-04-04 09:06:04
来自:建筑结构/混凝土结构
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1.7 正截面受弯承载力计算
1.7.1 踏步段梯板计算
梯板计算跨度 B0 = Min{B + b, 1.05B} = Min{1570, 1439} = 1439mm
1.7.1.1 踏步段梯板跨中 Mmax = 1/8·Qs·B02 = 0.125*11.16*1.4392 = 2.89kN·m
As = 49mm2,as = 25mm,ξ = 0.075,ρ = 0.03%; ρmin = 0.21%,As,min = 396mm2;
实配纵筋: φ10@180 (As = 436); 最大裂缝宽度 ωmax = 0.006mm
1.7.2 水平段梯板计算
1.7.2.1 水平段梯板跨中 Mmax = 1/8·Qh·B02 = 0.125*7.23*1.4392 = 1.87kN·m
As = 107mm2,as = 24mm,ξ = 0.037,ρ = 0.16%; ρmin = 0.21%,
As,min = 191mm2; 实配纵筋: φ8@200 (As = 251); 最大裂缝宽度 ωmax = 0.021mm
1.7.3 梯梁计算
1.7.3.1 梯梁跨中 Mmax = 1/8·Q·L02 = 0.125*11.16*3.6752 = 18.84kN·m
As = 222mm2,as = 47.5mm,ξ = 0.132,ρ = 0.44%; 最大裂缝宽度 ωmax = 0.435mm
它的结果好像只配了踏步段和水平梯段的底筋,面筋是不是没算啊?
用理正算的话结果看得比较清楚,但听别人说不准的
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