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弯扭复合作用下RC圆形桥墩抗震性能

, PP. 75-83

Keywords: 桥梁工程,钢筋混凝土桥墩,循环试验,弯曲-扭转相互作用,抗震性能

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Abstract:

?为了阐明弯曲和扭转耦合作用下RC圆形桥墩的抗震性能,对扭弯比不同的12个RC圆形桥墩进行了循环试验研究,并基于试件的破坏特征、滞回性能和钢筋应变等试验观测结果,分析了弯扭复合作用下扭转作用对桥墩抗弯能力的影响,以及配筋率、箍筋间距及箍筋形式对桥墩弯曲和扭转性能的影响;采用有限元软件ABAQUS模拟了不同扭弯比的RC圆形桥墩在弯扭复合作用下的破坏特性和弯扭承载能力。研究结果表明:弯扭相互作用降低了RC圆形桥墩的抗弯和抗扭承载力,桥墩的变形特征和失效模式发生了改变,损伤破坏区要高于弯曲塑性铰长度区域,提出的“交叉互锁”螺旋箍筋形式可有效解决由于扭转效应导致的RC圆形桥墩承载能力降低的问题。

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