Seismic Pounding Analysis Of Large-Scale Double Aqueduct Longitudinal Structures

The position of the expansion joint of the large double-channel aqueduct structure is prone to collision under strong earthquake.The occurrence of the collision will cause the damage of the double-trough aqueduct structure,which will seriously affect the water transport function of the double-trough aqueduct structure.However,there are few studies on the collision of double-slot structures.Therefore,it is of great significance to study the seismic design of double channel aqueduct.This paper discusses the longitudinal impact response of double-channel aqueduct structure under different working conditions through numerical simulation based on the factors affecting the impact response,in order to provide important reference for future seismic design of large double-channel aqueduct structure.In this paper,the finite element software ABAQUS is used to build a three-span large-scale double-channel aqueduct structure model,so as to study the collision between adjacent trough bodies and between trough bodies and trough platforms under strong earthquakes.By changing the parameters of collision impact: expansion joint spacing,site type,Angle of seismic wave input,the effect of water groove,seismic wave peak,comprehensively analyzed the double slot collision response of the aqueduct structure under different conditions,including tank body displacement of pier top displacement,collision frequency,and collision force peak,the bottom of the pier shear,pier base bending moment.The calculation results show that the finite element software ABAQUS can well simulate the collision of the double-channel aqueduct structure and clearly show the location of the collision through the post-processing module.The cloud diagram can show the magnitude of the collision force generated by the location of the collision.However,finite element software takes a long time to simulate the collision and occupies a large memory.FORTRAN program was used to study the impact response of multi-span double-channel aqueduct under various working conditions.The results show that the FORTRAN program can greatly reduce the computation time and memory consumption in the analysis of two-channel aqueduct structure collision.The results show that:(1)The location of the collision can produce a huge impact force,which will lead to the destruction of the expansion joint of the double-channel aqueduct structure,thus seriously affecting the normal water transfer function of the double-channel aqueduct.(2)The impact of the collision causes the acceleration of the beam body to increase rapidly,and the impact of the collision on the body of the trough and the body of the trough and the platform is obviously different,which is manifested by the obvious collision response near the platform.(3)The change of telescopic joint spacing has a great impact on the collision,which is shown as follows: the number of collisions tends to decrease and the peak of collision force tends to increase with the increase of telescopic joint spacing within a certain range;It is found that the impact of double-channel aqueduct structure has obvious spectral sensitivity to seismic waves.As the seismic wave increases along the longitudinal input Angle,the collision response decreases.With the increase of the acceleration peak of the input seismic wave,the collision response is intensified.With the increase of water body in the tank,the collision response increases.