预应力双柱式摇摆墩结构体系摇摆谱分析

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振动与冲击 ›› 2022, Vol. 41 ›› Issue (10) : 270-277.

论文

预应力双柱式摇摆墩结构体系摇摆谱分析

王宝夫1，2，石钰3，石祥锋1，张红芬1

作者信息 +

Rocking spectrum of a post-tensioned double-column rocking bridge system

WANG Baofu1,2, SHI Yu3, SHI Xiangfeng1, ZHANG Hongfen1

Author information +

文章历史 +

摘要

摇摆桥墩的损伤和残余位移小，具有良好的震后可恢复性。本文以预应力双柱式摇摆墩结构体系为研究对象，考虑预应力筋对摇摆刚度的影响，基于拉格朗日方程和动量矩守恒定理给出预应力双柱式摇摆墩的刚体动力分析模型，并进行脉冲型地震动作用下的摇摆谱分析。研究结果表明：长周期脉冲地震动作用下，预应力筋可以有效减轻低墩的地震反应；随着桥墩高度的增加或地震动频率的增加，预应力筋对桥墩地震反应的影响降低，桥墩依靠自身转动惯量抵抗地震作用；负摇摆刚度既可有效避免桥墩的倒塌，又能减轻脚点处的局部损伤，可在摇摆墩设计时采用。

Abstract

Rocking bridge piers can exhibit minor damage and residual displacements, displaying superior post-earthquake performance. This paper investigates the rocking response of double-column rocking bridge system which is enhanced with elastic prestressed central tendons. Following Lagrange equation and momentum conservation law, a dynamic analytical model is derived where the effect of the prestressing force of the tendons are considered. The analytical model is used to construct rocking spectrum of post-tensioned double-column rocking bridge system under pulse-type ground motions. The results show that the post-tensioned tendons are effective in reducing the response of double-column rocking bridge with small columns when subjected to long period excitations. With the increase of the size of the column or the frequency of the excitation, the influence of the tendons on the rocking response becomes marginal, whereas the bridge pier mainly depend on the rotational inertia of their columns to resist the earthquake action. Rocking bridge system with negative stiffness, which can effectively avoid the collapse of the pier without inducing local damage at the pivoting points, can be used in seismic design of double-column rocking bridge system.

导出引用

王宝夫1，2，石钰3，石祥锋1，张红芬1. 预应力双柱式摇摆墩结构体系摇摆谱分析[J]. 振动与冲击, 2022, 41(10): 270-277

WANG Baofu1,2, SHI Yu3, SHI Xiangfeng1, ZHANG Hongfen1. Rocking spectrum of a post-tensioned double-column rocking bridge system[J]. Journal of Vibration and Shock, 2022, 41(10): 270-277

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