Vertical Seismic Performance Research Of Steel Truss In The Station Hall Layer Of High-speed Railway Station

Abstract:High-speed railway station is a hub of high-speed railway. Long-span steel truss structure of station hall as a new structure is concrete floors in the upper string, which is made for the waiting hall. What’s more, the device layer is in the middle of upper sting and the lower.To sum up, the whole truss under high load is more sensitive to the vertical earthquake. The research of the response characteristics and mechanism in the system under vertical seismic is of great significance for furtherly improving design procedures in this kind of high-speed railway stations. This article focusing on the vertical seismic extent of steel truss in the hall layer of high speed railway passenger station, carried out theoretical and experimental study, completed the following main work, which is based on reading domestic and foreign related research work.Comprehensively considering the effects of dynamic characteristics and boundary conditions, we determine that the experimental prototype is the nine-truss unit. Finite element analysis shows that prototype of the test never yield when only considering the vertical earthquake and rarely met earthquake standards. Through the comparison of vertical displacement of the key point, we selected seismic waves of shaking table test which input it. Pushdown method is used to determine the yield mechanism and the weak link of the prototype structure, to provide references for shaking table test.Based on multi-functional shaking table test system of high-speed railway in central south university.We experiment on shaking table of reduced scale mode at a1/20large proportion. The design and construction of the shaking table test model is mainly about the determination of similar relation. Limited analysis was carried out on the test model again, and the modal analysis results show that test model of the design and the prototype structure has good comparability.We studied the acceleration and strain response,along with the yield mechanism and the weak link of the test model under different level earthquake with three natural waves input as impel in the experiments.The dynamic behavior results of the shaking table test model are in good agreement when compared with finite element calculation.This account for rationality of test model design of shaking table, the better quality construction, and can reflect the response of prototype structure under vertical seismic.Experiments show that the vertical stiffness of steel truss in hall layer of high-speed railway station is bigger, which can satisfy the vertical seismic requirements and has a large surplus.The destruction which is the first to appear is in CHJ-P(N) the node position of ends in the main-truss oblique abdominal lever while the main components of yield failure did not occur.