铁路重力式桥墩抗震计算简化模型研究

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振动与冲击 ›› 2021, Vol. 40 ›› Issue (9) : 71-76.

论文

铁路重力式桥墩抗震计算简化模型研究

鲁锦华，陈兴冲，丁明波，马华军，张熙胤

作者信息 +

Simplified aseismic calculation model for railway gravity bridge pier

LU Jinhua, CHEN Xingchong, DING Mingbo, MA Huajun, ZHANG Xiyin

Author information +

文章历史 +

摘要

针对低配筋铁路重力式桥墩破坏时仅在墩底形成一条主裂缝，墩底混凝土压碎不明显，未形成塑性铰区，且动力作用下有明显摇摆现象的特征，提出了一种适用于该类桥墩的抗震计算简化模型，即在自由摇摆桥墩双弹簧模型的基础上再加上考虑纵向钢筋仅受拉的两个弹簧的四弹簧模型。依据模型桥墩试验结果确定了仅受拉弹簧刚度的参数取值；通过静力作用下和动力作用下的四弹簧模型计算值与试验值对比，验证了四弹簧抗震分析模型可用于铁路重力式桥墩的抗震简化计算。

Abstract

Here, aiming at situations of only one main crack being formed at the bottom of a railway gravity bridge pier with low reinforcement, concrete at the bottom of the pier being not obviously crushed without plastic hinge area formed, and existing obvious rocking phenomenon under dynamic action, a simplified aseismic calculation model for this kind of bridge pier was proposed.It was shown that this model is a 4-spring one of the 2-spring model of a free swing bridge pier added 2 springs for a longitudinal steel bar only under tension.According to the model pier test results, stiffness values of springs only under tension were determined.The calculation results of the 4-spring model under static and dynamic actions were compared with the test ones.It was verified that the 4-spring aseismic analysis model can be used for simplified aseismic calculation of railway gravity bridge pier.

导出引用

鲁锦华，陈兴冲，丁明波，马华军，张熙胤. 铁路重力式桥墩抗震计算简化模型研究[J]. 振动与冲击, 2021, 40(9): 71-76

LU Jinhua, CHEN Xingchong, DING Mingbo, MA Huajun, ZHANG Xiyin. Simplified aseismic calculation model for railway gravity bridge pier[J]. Journal of Vibration and Shock, 2021, 40(9): 71-76

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