地基上下震动时高桥墩的动力屈曲

罗松南;宋君晗;冯鑫

振动与冲击 ›› 2011, Vol. 30 ›› Issue (11) : 157-160.

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振动与冲击 ›› 2011, Vol. 30 ›› Issue (11) : 157-160.
论文

地基上下震动时高桥墩的动力屈曲

  • 罗松南; 宋君晗; 冯鑫
作者信息 +

Dynamic buckling of the high pier under the foundation perpendicular motion by earthquake

  • Luo Song-nan; Song Jun-han; Feng Xin
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文章历史 +

摘要

考虑大变形的影响,建立高桥墩在地震波冲击下引起的地基上下震动时的非线性动力学基本方程式;通过位移形函数假设,采用伽辽金积分方法得到了时间变率的动力学控制方程;对时间变率的非线性微分方程进行数值求解,给出了同一地震波不同强度下高桥墩的位移响应曲线以及从产生横向振动到失稳的全过程;得到了地震波冲击时高桥墩失稳的临界地震加速度和失稳时刻。通过数值算例比较了地震波幅值、高桥墩柔度以及桥面质量大小对位移幅值响应曲线、临界地震加速度和失稳时刻的影响。

Abstract

Considering the influence of the large deformation, the non-linear dynamic equations of high pier under the foundation Perpendicular motion by earthquake are established. By supposing the displacement shape function and applying the Galerkin method, the dynamic equations about time are gained. By processing numerical calculation, the displacement response curves of the high pier under the foundation Perpendicular motion by earthquake with different magnitude and the overall process from the transverse vibration to the instability of the high pier are given. The critical seismic acceleration and the instability time are obtained. The influence of the different seismic peak, the slenderness ratio and the weight of the bridge on the displacement response, the critical seismic acceleration and the instability time are analyzed.

关键词

地基 / 上下震动 / 高桥墩 / 动力响应 / 动力屈曲

Key words

foundation / Perpendicular motion / high pier / displacement response / dynamic buckling

引用本文

导出引用
罗松南;宋君晗;冯鑫. 地基上下震动时高桥墩的动力屈曲[J]. 振动与冲击, 2011, 30(11): 157-160
Luo Song-nan;Song Jun-han;Feng Xin. Dynamic buckling of the high pier under the foundation perpendicular motion by earthquake[J]. Journal of Vibration and Shock, 2011, 30(11): 157-160

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