1.混凝土强度等级:C30 fc = 14.33N/mm ft = 1.43N/mm
2.钢筋强度设计值 fy = 360N/mm Es = 200000N/mm
3. 由弯矩设计值 M 求配筋面积 As,弯矩 M = 180kN·m
4. 截面尺寸 b×h = 200*500mm ho = h - as= 500-40 = 460mm
计算结果:
相对界限受压区高度 ξb
ξb = β1 / [1 + fy / (Es * εcu)] = 0.8/[1+360/(200000*0.0033)] = 0.518
受压区高度 x = ho - [ho ^ 2 - 2 * M / (α1 * fc * b)] ^ 0.5
= 460-[460^2-2*180000000/(1*14.33*200)]^0.5 = 167mm
相对受压区高度 ξ = x / ho = 167/460 = 0.362 ≤ ξb = 0.518
纵向受拉钢筋 As = α1 * fc * b * x / fy = 1*14.33*200*167/360
= 1328mm
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