Dynamics and key technology research on high-speed railway track-bridge system under multiple dynamic sources
Yu Zhiwu1,2 He Huawu3 Jiang Lizhong1,2 He Xuhui1,2 Sun Shuli4 Chen Kejian5
1. Central South University, Changsha 410075, China；
2. National Engineering Laboratory for High Speed Railway Construction, Changsha 410075, China;
3. China Railway Corporation, Beijing 100844, China;
4. China Railway Design Corporation, Tianjin 300142, China;
5. China Railway Eryuan Engineering Group Co., Ltd., Chengdu 610031, China
Abstract：There are many technical problems in the high-speed train-track-bridge system under multi-source excitation (e.g. train, earthquake and strong wind). The model experiments, field tests, theoretical analysis and numerical simulations of high speed railway track-bridge system were continually carried out in the past ten years. Based on the probability density evolution method, a random dynamic theory of track-bridge coupled system considering multi-source dynamic effect was newly built up, and the running safety estimation theory of high speed railway when train runs on the bridge was constructed. The experimental platform and complete test technology of high-speed railway track-bridge system, which solve the difficulties of the dynamic behavior representation of complex physical system, are established, and also the concept of earthquake fortification and wind resistant design of high-speed railway track-bridge system was innovated. The design and evaluation method of seismic and wind load are proposed, as well as the disaster reduction technology. These researches are vastly applied in the design and maintenance in high-speed railway track-bridge system.
