高铁轨道-桥梁系统地震损伤轨道不平顺谱述评

Review on Track Irregularity Spectrum of High-speed Railway Track-bridge System Damage by Earthquake

轨道不平顺谱可表征与评价某类线路的宏观几何状态,是轨道平顺状态评定及轨道病害判定的重要指标,也是重要的输入激励之一。我国高铁的建造在时空上无法完全避开地震区域,若能将高铁线路地震损伤纳入轨道不平顺,提出考虑地震损伤的高铁桥上轨道不平顺谱,对综合管理震后线路轨道平顺状态,正确评估震后列车的走行安全性均具有重要意义。因此,提出考虑地震损伤的高速铁路桥上轨道不平顺谱计算方法,总结计算方法中各部分(包括高速铁路轨道-桥梁系统震致线桥一体化模型、震致损伤演化机理、震致损伤映射机理及震致轨道不平顺谱)研究进展;并指出目前考虑地震损伤的高速铁路桥上轨道不平顺谱的研究不足和发展趋势。

Track irregularity spectrum can represent and evaluate the macroscopic geometric state of a certain kind of track,which is an important index for the evaluation of track smoothness state and the judgment of track damages,and also one of the important input excitations.The construction of high-speed railway in China can hardly be located away from the earthquake area in time and space.If the earthquake damage of high-speed railway line is included into the track irregularity spectrum,the proposed track irregularity spectrum considering earthquake damage on high-speed railway bridge will be of great significance to comprehensively manage the track smoothness state of post-earthquake railway line and correctly evaluate the safety of train running after earthquake.Therefore,the calculation method of track irregularity spectrum for high-speed railway bridge considering earthquake damage is proposed,and the research progress of each part of the calculation method(including the integrated model of high-speed railway track-bridge system induced by earthquake,the evolution mechanism of earthquake-induced damage,the mapping mechanism of earthquake-induced damage and the track irregularity spectrum induced by earthquake)is summarized.The research deficiencies and development trend of track irregularity spectrum on high-speed railway bridges considering seismic damage are pointed out.