考虑徐(温)变效应的列车与连续梁-框架墩桥耦合振动分析  

Vehicle-bridge coupling vibration analysis of continuous beam-framework pier bridge considering concrete creep and temperature deformation

作　　者：苗永抗[1] 尹邦武[1] 郭向荣[1] 

机构地区：[1]中南大学土木工程学院,湖南长沙410075

出　　处：《铁道科学与工程学报》2013年第2期5-10,共6页Journal of Railway Science and Engineering

基　　金：国家自然科学基金资助项目(51178471)

摘　　要：为探讨预应力混凝土连续梁-框架墩桥在高速铁路设计与使用中的舒适性与安全性,以某7×16 m七跨等截面连续梁桥为例,将不同徐(温)变形组合曲线叠加到轨道不平顺谱中,并根据弹性系统动力学总势能不变原理及行成矩阵的"对号入座"法则,建立车桥振动方程及分析模型。结果表明,考虑徐(温)变形引起的桥面不平顺的桥梁响应值比未考虑其影响的值较大,而随所采用的桥面组合变形曲线的不同而变化不敏感,车辆响应中的横向加速度和横向Sperling指标接近允许值,必须予以足够重视。In order to explore the comfort and security of prestressed concrete continuous beam - framework pier bridge in the usage and the design of high - speed railway a 7 multiply 16 m seven continuous beam of uniform cross section was taken as an example. By overlapping the combinational curves of deformations with different creeps and temperatures to track irregularities, the coupling vibration equation and analysis model were estab- lished. According to the principle of total potential energy with stationary value in elastic system dynamics and the＂ setting in right position＂ rule for formulating system matrixes. The results show that the response value of considering deck irregularities is bigger than that without considering deck deformations, but it is not sensitive when calculating with combinational curves of deformations. Moreover, if the calculated value of lateral accelera- tion and Sperling index of vehicle is close to the allowable value,enough attention should be paid to.

关 键 词：连续梁-框架墩 徐(温)变形 车桥耦合 动力响应 

分 类 号：U448.35[建筑科学—桥梁与隧道工程]