基于精细化数值模拟的FPS隔震曲线桥抗震性能研究

项目名称： 基于精细化数值模拟的FPS隔震曲线桥抗震性能研究

项目编号： No.51308027

项目类型： 青年科学基金项目

立项/批准年度： 2014

项目学科： 建筑科学

项目作者： 焦驰宇

作者单位： 北京建筑大学

项目金额： 25万元

中文摘要： 曲线桥梁易于发生落梁、墩柱弯剪破坏等严重震害，由于其平面不规则，宜采用FPS隔震支座控制墩梁相对位移、降低墩柱损伤。但现有研究缺乏对曲线桥FPS隔震体系的精细化数值模拟，难以揭示该类曲线桥真实的地震反应特点和损伤破坏机理。基于此，本项目拟首先通过试验研究与数值模拟的对比，确定FPS支座在动轴力及双向耦合受力下的本构模型和计算参数；其次对相邻联碰撞条件进行精细化数值模拟，利用显式动力分析确定接触单元碰撞刚度及阻尼参数，提出考虑曲线桥非均匀碰撞的精细化模拟方法；然后，开展三维地震输入下FPS隔震曲线桥的抗震性能研究，利用自适应推覆分析获得的地震易损性曲线，确定曲线桥关键减震率评价指标；最后，探讨地质条件、几何条件、结构参数、碰撞条件等因素对该体系抗震性能的影响，综合评价曲线桥FPS隔震体系的适用范围、限制条件。本课题将为我国城市曲线桥梁的抗震设计及减震控制理论提供理论基础和技术支持。

中文关键词： 曲线梁桥；建模方法；FPS支座；双轴耦合；减隔震

英文摘要： A curved bridge is prone to occurring girder falling, pier bending and shearing failures and other serious earthquake damages. Due to the plane irregularities of the curved bridge, it's better to adopt the FPS bearing to control the relative displacements between pier and girder and reduce pier damage. But the existing researches lack of refinement numerical simulation method for curved bridge FPS system. It's hard to reveal the real seismic response characteristics and failure mechanism of the FPS isolation curved bridge under 3-D ground motion action. Based on this, first of all, this project will determined the constitutive model and its parameters of the FPS bearings considering bi-directional coupling effects through comparison between the experimental study and the numerical simulation study; Secondly, a refined numerical simulation model of curved girder and its adjacent girders will be built, the explicit dynamic analysis will be done considering seismic pounding effects, by which the pounding stiffness and damping parameters of the contact elements can be determined. Then a refinement numerical model method consider the uneven distribution of pounding effect in curved bridges can be given; Thirdly, the seismic performance of the FPS isolation curved bridges under 3-D ground motion excitation will be st

英文关键词： curved bridge;；modeling method；Friction Pendulum Bearing；Bilateral Coupled Effect；seismic mitigation and isolation