温度变形对大跨度钢箱系杆拱桥车桥动力响应的影响

Influence of temperature deformation on vehicle-bridge dynamic response of long-span steel box-girder tied-arch bridge

为分析温度变形对大跨度钢箱系杆拱桥列车走形性的影响,以某跨度为96 m的四线下承式钢箱系杆拱桥为例,首先建立该桥的动力分析模型并对其进行自振特性分析,然后,根据弹性系统动力学势能不变值原理与形成矩阵的"对号入座"法则,分别考虑桥梁在3种温度体系(未考虑温度、升温、降温)下产生的变形影响,将其以组合曲线的形式叠加到轨道不平顺中进行列车走行性分析,建立车桥系统的空间振动方程,并对3种工况下的车桥耦合动力响应进行计算分析。研究结果表明:温度变形对桥梁动力响应的影响不大,对列车响应中脱轨系数、横向力、车体横向加速度及横向sperling指标有显著的影响,但在各温度变形工况下列车走行性仍满足限值要求。

In order to analyze the influence of temperature deformation on the train running performance of long - span steel box - girder tied - arch bridge, a bridge of such type with a span of 96 m was cited as an example firstly, the dynamic analysis model of the bridge was built and the natural vibration characteristics were investiga- ted. Then based on the principle of total potential energy with stationary value in elastic system and the ＂set in right position＂ rule for formulating system matrixes, the coupling vibration equation of train - bridge system was established considering the deformation influence of the bridge while was added to track irregularity as composite curve form under three kinds of temperature system （ without considering temperature, heating - up, cooling - down ） and the dynamic response of vehicle - bridge coupling system was calculated under the three conditions. The results show that the effect of temperature deformation on dynamic response of bridge is not huge, while it has a significant effect on the derailment coefficient, lateral force, the lateral acceleration and the lateral sperling index, which otherwise can still meet the requirements of running property under different temperature deformation conditions.