介绍: Nlw=1.4×ωk×3×h×3×la=1.4×0.78×3×1.5×3×1.2=17.65kN长细比λ=l0/i=2200/15.8=139.24,查《规范》表A.0.6得,φ=0.39(Nlw+N0)/(φAc)=(17.65+3)×103/(0.39×489)=108.01N/mm2≤0.85 ×[f]=0.85 ×205N/mm2=174.25N/mm2 满足要求!拉接部分柔性钢筋的最小直径计算:拉接柔性钢筋的抗拉强度fy=205N/mm2