厦深铁路榕江特大桥主桥车-桥耦合振动分析

Analysis of Train-Bridge Coupling Vibration of Main Bridge of Rongjiang River Bridge on Xiamen-Shenzhen Railway

厦深铁路榕江特大桥主桥为(110+2×220+110)m下承式大跨度刚性桁梁柔性拱组合体系桥。为了解其在设计时速下车-桥系统的动力性能,基于ANSYS软件建立全桥有限元模型,分析其自振特性,采用SIMPACK和ANSYS联合数值仿真分析方法,计算CRH2动车组列车运行时桥梁和列车组的动力响应,并与现场实测值和规范限值进行对比,评价该桥在列车设计时速下车-桥系统的安全性和舒适性。结果表明:双线行车可有效减小桥梁跨中的横向振动,但对列车响应的影响很小;车速250km/h时桥梁各动力响应值均大于车速220km/h时的值,且均满足规范限值;在各工况下,列车组的车辆脱轨系数、轮重减载率、轮轴横向力和车体加速度均小于标准限值,舒适性指标均为优或良,列车运行安全性和舒适性满足规范要求。

The main bridge of the Rongjiang River Bridge on Xiamen-Shenzhen Railway is a long span through hybrid system bridge of rigid steel truss girder and flexible arches with span arrangement (110+2×220+110) m. To understand the dynamic performance of the train-bridge system of the bridge at the designed train speeds, the software ANSYS was used to set up the finite element model for the whole bridge of the bridge and the natural vibration characteristics of the bridge were analyzed. The combined numerical simulation analysis method of the SIMPACK and ANSYS was also used to calculate the dynamic responses of the trains and bridge under the traveling of the CRH2 EMU trains, the calculation values were compared to the field measurement values and the values as provided in the codes and the safety and riding comfort of the train-bridge system of the bridge under the designed train speeds were evaluated. The results show that the traveling of the trains on the double tracks can effectively reduce the lateral vibration at the midspans of the bridge, however, the influences of the traveling of the trains on the train responses are little. At the train speed of 250 km/h, the response values of the bridge are all greater than the values of the bridge at the train speed of 220 km/h and can satisfy the relevant requirements in the codes. Under the different load cases, the values of the derailment coefficients, wheel load reduction rates, wheel axis lateral forces and body acceleration of the trains are all less than the standard limit values, the indices of the riding comfort are excellent or good and the train traveling safety and the riding comfort can satisfy the requirements in the codes. © 2017, Journal Press, China Railway Bridge Science. All right reserved.