耗能型辅助墩抗震性能数值研究

发布时间：2018-01-12 21:13

本文关键词：耗能型辅助墩抗震性能数值研究　出处：《工程力学》2014年12期 　论文类型：期刊论文

【摘要】：耗能型辅助墩可以有效地实现大跨度斜拉桥的地震损伤控制。刚度和强度是耗能型辅助墩的关键设计参数,因此,该文对安装剪切型连梁和屈曲约束支撑两种耗能构件的双柱墩进行理论分析,推导了耗能型辅助墩的刚度和强度的简化计算公式,能够快速准确地估算其弹性刚度和屈服强度。通过有限元模型,仿真分析了其滞回性能,可以准确地模拟耗能型辅助墩的非线性行为,为大跨度斜拉桥的整体弹塑性分析提供了可靠的依据。与试验结果对比,验证了简化公式和有限元模型的准确性。对比研究了安装耗能构件的双柱墩试件和拆除耗能构件的裸双柱墩试件的性能差异,结果表明耗能构件能够显著提高辅助墩的抗震能力。最后,对安装屈曲约束支撑的辅助墩抗震性能进行了参数分析。
[Abstract]:Energy dissipation auxiliary pier can effectively control the seismic damage of long-span cable-stayed bridge. Stiffness and strength are the key design parameters of energy-dissipation auxiliary pier. In this paper, the theoretical analysis of double-column piers with shear-coupled beams and buckle-restrained braces is carried out, and a simplified formula for calculating the stiffness and strength of energy-dissipation auxiliary piers is derived. The elastic stiffness and yield strength can be estimated quickly and accurately. Through the finite element model, the hysteretic behavior of the pier is simulated, and the nonlinear behavior of the energy-dissipation auxiliary pier can be accurately simulated. It provides a reliable basis for elastic-plastic analysis of long-span cable-stayed bridge. The accuracy of the simplified formula and the finite element model are verified. The performance differences between the dual-column pier specimens installed with the energy-dissipation members and the bare double-column pier specimens with the energy dissipation members removed are compared. The results show that the energy dissipation member can significantly improve the seismic capacity of the auxiliary pier. Finally, the seismic performance of the auxiliary pier with buckling restrained braces is analyzed.
【作者单位】：同济大学土木工程防灾国家重点实验室;上海师范大学建筑工程学院;
【基金】：国家自然科学基金重大研究计划重点支持项目(90915011)
【分类号】：U442.55;U448.27
【正文快照】： 在强震作用下能够提供可靠的耗能机制耗散地震能量对结构安全来说是至关重要的。非弹性变形既能够限制构件中的力从而保持合理的设计尺寸,又可以为结构体系提供滞回耗能。在结构中设计一些牺牲构件来耗散地震能量,同时保护主要构件免遭地震损伤,这就是结构损伤控制的概念[1]。

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