Static And Dynamic Analysis Of Long Span Soil-steel Composite Bridge

Soil-steel composite bridges are commonly used as road and railway culvert at home and abroad due to its advantages including quicker construction process,lower cost of erection and maintenance,architectural values and others.Because of later application and research,the research conditions in our country lag behind some developed countries abroad.The ongoing research focus on static force almost about small-to-medium span bridges,in terms of dynamic aspect is most about impact coefficient and vibration characteristics of the structures.However,there are rarely research about response of the structure under earthquake action.Therefore,it’s necessary to study large diameter soil-steel composite bridges on static and dynamic especially seismic behavior.This paper investigates the performance of a 12m diameter circular soil-steel composite bridge by creating 3D finite element model to conduct static analysis,the distribution law of max compressive stress was achieved after computation,comparing the computational results of max compressive stress with AISI and CHBDC codes,difference among them was found and the reason for the difference was interpreted,the results show that the AN SYS results are reliable.A number of 2D finite element models were created to analyze the factors that affect vertical deformation and stress of the corrugated steel plate.The results show that the vertical deformation of the corrugated steel plate increases with the increase of the filling thickness,and decreases with the increase of elastic modulus,wave size and wall thickness,the total stress significantly increases with the increase of filling thickness and significantly decreases with the increase of wall thickness,the elastic modulus of soil and wave size have little effect on total stress.Two natural seismic wave and one artificial seismic wave were chosen to analyze seismic time-history response by using uniform excitation,the results show that the maximum horizontal displacement and vertical displacement of the structure are lied in spandrel,the maximum displacement is 2.78mm;the maximum value of horizontal stress locates at spandrel is 0.508MPa and the maximum value of vertical stress locates at arch springing is 0.962MPa,the maximum value of max compressive stress locates at arch springing is 0.953MPa.Therefore,it can be concluded that the soil-steel composite bridges have a good anti-earthquake performance.