Simulation Research on Dynamic Responses of Ballastless Track Slab Structure Simple Box Girder under Time Harmonic Load
According to the fact that the simple box girder bridge of ballastless track system are replaced by elastic foundation using equal rigidity method usually in the highspeed railway at present, that simplified calculation could not be a true dynamic response reflection of the bridge structure to the ballastless track system. So a new overall 3D models with simple box girder and track slab are built by using ANSYS software, dynamic response results of track slab in the overall structure are analyzed at different speeds under high-speed railway harmonic loads. The results showed that the displacement curves of track slab, mortar cushion and concrete base plate overlap almost under harmonic loads, and the components and the bridge vibration is synchronized, the maximum vertical displacement of track slab, mortar cushion and concrete base plate in the ballastless track system increasing with the train speed; The maximum acceleration is also increasing slowly with the train speed, the maximum acceleration of track slab is 450m/s2 when the speed is 350km/h; The track slab with tensile stress appears under harmonic loads, so track slab and mortar cushion should have sufficient adhesive strength to prevent separating from each other under cyclic loading.
ballastless track slab harmonic load simple box girder dynamic responses finite element
Lei Yu Ji-wen Zhang Dong Wang
College of Civil Engineering, Southeast University Nanjing, China Construction Headquarters of New Campus, Henan University of Economics and Law Zhengzhou, China
国际会议
太原
英文
572-575
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）