高烈度地区多跨长联连续梁桥抗震体系研究

发布时间：2019-02-12 23:55

【摘要】：为研究高烈度地区多跨长联连续梁桥采用不同抗震体系时的抗震性能,以韩江特大桥主桥[(55+4×90+55)m连续梁桥]为背景,分别采用传统抗震体系、延性抗震体系和减隔震体系进行抗震设计,采用ANSYS软件建立全桥有限元模型,比较采用不同抗震体系时桥墩在罕遇地震作用下的地震响应。结果表明:在罕遇地震作用下,连续梁桥采用减隔震体系时,摩擦摆支座顺桥向来回滑动,形成稳定、饱满的滞回环,支座耗散地震能量显著;采用延性抗震体系时,固定墩墩底滞回曲线为完整的滞回环,地震能量通过塑性铰的滞回机制进行耗散;采用减隔震体系时,桥墩的顺桥向位移较传统抗震体系大幅降低;采用延性抗震体系时,桥墩的顺桥向位移比传统抗震体系下大;采用减隔震体系或延性抗震体系时,固定墩的内力响应较传统抗震体系下都大幅降低,且采用减隔震体系时减震效果更好。
[Abstract]:In order to study the seismic performance of multi-span long-span continuous beam bridges with different seismic systems in high-intensity areas, the traditional seismic system is adopted in the background of the main bridge of Hanjiang Bridge [(554 脳 9055) m continuous beam bridge]. The seismic design of ductile seismic system and seismic isolation system is carried out. The finite element model of the whole bridge is established by using ANSYS software, and the seismic response of pier under rare earthquake is compared with that of different seismic system. The results show that the friction pendulum bearing slips back and forth to form a stable, full hysteresis loop, and the seismic energy dissipation of the bearing is significant when the continuous beam bridge adopts the shock isolation system. When the ductile seismic system is adopted, the hysteretic curve at the bottom of the fixed pier is a complete hysteresis loop, and the seismic energy is dissipated through the hysteretic mechanism of plastic hinge, and the displacement of the bridge piers along the bridge direction is greatly reduced compared with the traditional aseismic system. When the ductile aseismic system is adopted, the displacement of the piers is larger than that of the traditional aseismic system. The internal force response of the fixed pier is significantly lower than that of the traditional seismic system when the isolation system or the ductile seismic system is adopted, and the damping effect is better when the isolation system is adopted.
【作者单位】：西南交通大学土木工程学院;陆地交通地质灾害防治技术国家工程实验室;广东省南粤交通潮漳高速公路管理中心;
【基金】：国家自然科学基金项目(51308471) 国家重点研发计划(2016YFB1200401) 广东省交通厅科技计划项目(2014-02-015)~~
【分类号】：U442.55;U448.215

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