Research On Seismic Performance Of A Large Span Prestressed Concrete Composite Continuous Box Girder Bridge With Corrugated Steel Webs

In recent years,prestressed concrete composite continuous box-girder bridge with corrugated steel webs is getting more rapid development prospects and great application in tapered section of large-span bridges with more complication structure as it has a great deal of advantages,such as light self-weight,high effective prestressing system,short construction period,beautiful shape,etc.So for its analysis dynamic and seismic performance can further deepen the understanding of the structure performance to constantly promote science and technology progress of bridge engineering.Based on some prestressed concrete composite continuous box-girder bridge with corrugated steel webs partially encased with concrete established as the engineering based and the research object,using the ANSYS software to analyse the seismic response and get the corresponding research conclusion.This paper mainly gives the following research contents and results:1.Based on the theory of dynamic finite element analysis of bridge engineering,the contrast research on prestressed concrete composite continuous box-girder bridge with corrugated steel webs for seismic response analysis of finite element modeling method determines the reasonable model partitioning strategy for the project in this paper.On this basis,respectively,set up open and not set in the reinforced concrete corrugated steel web plate lining of long-span PC continuous box girder bridge,the finite element dynamic analysis model,and through the model analysis results proves the rationality of the model.2.Using large scale finite element analysis software ANSYS to establish the corrugated steel web of box girder bridge and conventional corrugated steel web plate box girder of the bridge model and do the modal analysis,response spectrum analysis and time history analysis of input seismic wave,which provides the argument relying on engineering structure seismic performance conditions.3.Modal analysis results show that the natural frequency of corrugated steel web plate plan is larger than the conventional scheme and the vertical bending stiffness,the lateral bending stiffness and torsional stiffness are all increased.Along the lateral,longitudinal and vertical three directions of E1 and E2 response spectrum analysis results show that the lining concrete enhances the shear capacity of the structure and is advantageous to the horizontal and vertical seismic bridge.4.Input seismic time history analysis results show that the set in concrete lining can be evenly transfer stress of the corrugated steel web plate and the results of the stress redistribution enhance the stiffness of the structure and improve the seismic performance of the structure.5.Analysis results show that the lining concrete structure seismic performance showed enhanced then weakening rule with the increase of the thickness and length.Therefore it is necessary to design in accordance with specific project,the reasonable thickness and length of lining concrete in the relevant conclusion can be used for reference in the practical engineering.