带肋圆管截面钢桥墩的延性影响因素研究

为研究带肋圆管截面钢桥墩在水平反复荷载作用下的延性影响因素,首先通过与试验结果对比,确认有限元分析方法的有效性,然后对承受水平反复荷载作用下的圆管钢桥墩进行一系列参数研究,详细讨论钢桥墩径厚比、纵向加劲肋数量以及纵向加劲肋长细比等对钢桥墩极限承载力和延性性能的影响。研究结果表明,随着钢桥墩径厚比和纵向加劲肋长细比的减小,圆管钢桥墩的延性性能得到很大改善。与配置4根纵向加劲肋相比,配置6根肋后的延性提高效果并不明显,而配置8根肋可以显著提高钢桥墩的延性性能。

RESEARCHES ON THE FACTORS AFFECTING THE DUCTILITY OF STIFFENED STEEL PIPE-SECTION BRIDGE PIERS

This paper aims to investigate the factors which affect the ductility behavior of stiffened steel pipe- section bridge piers subjected to a constant vertical load and cyclic lateral loads. The accuracy of the proposed finite element formulation is first verified by comparing the analytical results with test results. Then, a series of parametrical studies are carried out to investigate the effects of radius-thickness ratio, number of longitudinal stiffeners, and stiffeners~ slenderness ratio on ultimate strength and ductility behavior of the stiffened bridge piers. It is found that the ductility capacity is greatly improved with the decrease in radius-thickness ratio of pipe section and the stiffeners slenderness ratio. Compared with the results obtained from the specimens with 4 stiffeners, there is little improvement effect on the ductility capacity in the case of 6 stiffeners, and an obvious effect in the case of 8 stiffeners is observed.