设置BRB桥梁排架墩基于位移抗震设计方法

发布时间：2018-03-17 06:13

本文选题：桥梁工程　切入点：基于位移抗震设计　出处：《土木工程学报》2017年07期 　论文类型：期刊论文

【摘要】：基于"保险丝"和"损伤控制"的抗震设计理念,提出在桥梁双柱式排架墩中通过设置屈曲约束支撑(BRB)以提高其横桥向抗震性能的构想。首先从获得"抗震能力"的角度对设置BRB桥梁排架墩的抗震设计参数进行系统性分析,推导出与剪跨比和墩柱间距与直径(边长)比相关的BRB核心段最大和最小长度取值范围;再从求解"地震需求"角度建立了设置保险丝的(SDOF)主结构体系弹塑性反应谱基本方程,分析该体系的非线性地震反应一般规律;然后,基于体系的"抗震能力"和"地震需求",发展了设置BRB的桥梁排架墩基于位移的抗震设计方法,并结合一个具体桥梁排架墩实例说明建议设计方法的可行性。
[Abstract]:Based on the concept of "fuse" and "damage control", This paper puts forward the idea of improving the seismic performance of the transverse bridge by setting buckling restrained bracing in the double-column bent pier of the bridge. Firstly, the seismic design parameters of the BRB bridge pier are systematically analyzed from the point of view of obtaining the "seismic capacity". The range of maximum and minimum length of BRB core segment related to the ratio of shear span to span and the ratio of pier spacing to diameter (side length) is derived, and the basic equation of elastoplastic response spectrum of the main structure system with fuse is established from the angle of solving "seismic requirement". The general law of nonlinear seismic response of the system is analyzed, and then, based on the "seismic capacity" and "seismic demand" of the system, the displacement-based seismic design method of the bridge piers with BRB is developed. The feasibility of the proposed design method is illustrated by an example of a concrete bridge bent pier.
【作者单位】：兰州理工大学;河北工业大学;
【基金】：国家自然科学基金(51478074,51668040) 博士后科学基金(2016M592908XB) 甘肃省自然科学基金(1610RJZA002)
【分类号】：U442.55

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