Static And Structural Dynamic Analysis Of Steel Truss Web Composite Beam Continuous Rigid Frame Bridge

Steel truss web composite beams use steel truss web members instead of the concrete webs of traditional prestressed concrete continuous beams.Compared with the prestressed concrete beam bridge,its self-weight is effectively reduced,there is no problem of web cracking,and the amount of engineering work is small.It is a new bridge type for the development of composite structure bridges in recent years.In this paper,Yunnan Diyoke No.1 Bridge(72+125+72)m corrugated steel web bridge is used as a prototype.The finite element model of the steel truss web composite beam bridge is established by using Midas / FEA software and Midas / civil software.The composite beam bridge is stressed and the steel web members of the main beam structure are adjusted.The influence of pile-soil interaction on the response spectrum analysis and time history analysis of the bridge is analyzed.The main research contents are as follows:(1)Analyzed the modeling analysis method of steel truss web composite beams,selected a suitable modeling method and built a solid model using Midas / FEA,analyzed the mechanical performance of composite beams,adjusted the influence of steel web members on beam deflection,and combined the Beam top and bottom forces are optimized.(2)Calculate the parameters of pile-soil interaction.Use Midas / civil to establish model A that considers pile-soil interaction and model B for consolidation at the bottom of the pier.Analyze the dynamic characteristics of bridge structure and pile-soil interaction on dynamic characteristics.(3)By analyzing the response spectra of model A and model B,the displacement and internal force responses of the bridge under earthquake are obtained,and the characteristics of the forces under the action of the composite beam under earthquake are analyzed.The results of the two models are compared to analyze the effects of pile-soil interaction on structural displacement and internal force response.(4)The time-history analysis of the two models of the bridge is performed to obtain the seismic response under horizontal excitation and three-dimensional excitation.The effects of different seismic waves on the bridge structure and the effects of vertical seismic excitation on the internal force and displacement response of the structure are analyzed.