大跨度连续曲线箱梁桥地震反应计算分析
Calculation and analysis of seismic response of long-span continuous curved box girder bridges
吴明杰 1颜燕祥 2蔡恒3
作者信息
- 1. 湖北工程学院建筑学院,湖北孝感 432000
- 2. 湖北工程学院土木工程学院,湖北孝感 432000
- 3. 武汉大学土木建筑工程学院,湖北武汉 430072
- 折叠
摘要
为研究多跨连续曲线箱梁桥在地震作用下的动力响应,基于虚功原理和动力有限元理论,推导了曲线箱梁桥的振动方程.采用ANSYS建立全桥空间有限元模型,验证了理论数值模型求解振动方程方法的有效性.针对El-centro波作用下的某3跨连续曲线箱梁桥,考虑了 4种地震激励工况,在MATLAB上采用Newmark-β法直接积分,对该梁桥的地震时程反应进行了计算分析.结果表明:墩柱动力响应表现出明显的空间性;结构在双向耦联水平地震作用下的位移和加速度峰值响应比在单向水平地震作用下的响应分别增大72.7％和145.7％;最大地震反应不一定沿着地震波输入方向,该结构地震波的最不利输入方向约为50°;大跨度连续曲线弯梁桥横向桥地震反应较大,容易在首尾处发生横桥向落梁破坏.
Abstract
In order to research dynamic response of continuous curved box girder bridges with multi-span under seismic action,the vibration equation of curved box girder bridges was established based on virtual work principle and dynamic finite element theory.The spatial finite element model of the whole bridge was established by using ANSYS to verify the effectiveness of the theoretical numerical model to solve the vibration equation.For a continuous curved box girder bridge with three spans under the action of El-centro waves,considering four kinds of seismic excitation conditions,the seismic time-history response of the bridge is calculated and analyzed by using the Newmark-β method in MATLAB.The results show that the dynamic response of pier columns present obvious spatiality,the peak displacement and acceleration increase 72.7％and 145.7％,respectively,under bi-directional coupling horizontal seismic action compared with those under unidirectional horizontal seismic action.The maximum seismic response is not necessarily along the seismic wave input direction,and the most unfavorable input angle of seismic waves is 50°.The transverse response of the long-span continuous curved bending beam bridge is large,and it is easy to cause the collapse of the transverse bridge beam at both ends.
关键词
连续曲线梁桥/地震响应/振动方程/Newmark-β法Key words
continuous curved beam bridge/seismic response/vibration equation/Newmark-β method引用本文复制引用
出版年
2024
NETL
NSTL
万方数据