钢筋混凝土曲柱的纵向弯曲

BUCKLING OF REINFORCED CONCRETE CURVED COLUMNS

本文研究大跨度拱桥悬臂施工中钢筋混凝土曲柱的纵向弯曲问题。通过理论和试验研究导出曲柱曲率分布系数β,测得16根抛物线曲柱在对称等偏心荷载作用下的中点附加挠度和极限承载力,归纳出载面刚度系数x_?和曲率φ的公式,从而得出钢筋混凝土曲柱和直柱η值的两种通用表达式。

This paper studies the buckling problem of reinforced concrete curved col-umns, which was raised in the construction of large span arch bridges by useof the cantilever method. Based on the theoretical analysis and experimentalresearch, the curvature distribution factors β are obtained; the additional de-flections in the midpoint and the ultimate carrying capacity of 16 reinforcedconcrete parabolic curved columns under load applied with equal eccentricityat both ends are measured; the calculation formulas of the section stiffnessfactor α_? and section curvature φ are derived. Then, the general formulas forcomputing eccentricity magnifying factor η of reinforced concrete curved andstraight columns are presented in two forms