Study On The Static And Dynamic Characteristcs Of Landscape Covered Pretressed Concrete Bridge

As a composite structure of architecture and bridge,corridor bridges have a long history of more than two thousand years developing in China With the both developments of modern bridges and buildings,people have a higher demand for covered bridges.However,after summarizing the current researching status of covered bridges,it is found that the research on mechanical properties of covered bridges is still not in-depth.Besides the huge loads from the upper parts,arch bridges are generally chosen as the lower structure of covered bridges.Therefore the research on girder bridges as the lower structure of covered bridges is extremely scanty.In view of the current research situation,this thesis studies static and dynamic characteristics of the continuous rigid frame gallery bridge as the underlying structure,and analyses the influence of gallery structure on the bridge structure.Taking a covered bridge in Leshan,Sichuan Province as an example,this thesis analyses this kind of bridge through the finite element software Midas/Civil 2017 modeling calculation.The main researching contents and methods are as follows:1.The developing course of covered bridges in China is Introduced,the characteristics of modern covered bridges is analyzed,the current research status of covered bridges is summarized2.Based on existing theories,taking a prestressing rigid frame gallery bridge in Leshan as an example,two models of structure and load for upper parts of the corridor bridge is established by using the finite element software Midas/Civil 2017.The static calculation of the two models to analyze the influence of gallery structure on the mechanical performance of bridges is carried out.3.The influence of the change of the tension sequence of the prestressing steel bundle on the construction process and operation stage of the gallery bridge is Analyzed.And the tension sequence of the steel bundle of the prestressing concrete rigid frame Gallery bridge is optimized.4.According to the two models of superstructure,which are simulated as structure and load respectively,dynamic characteristics of the structure is analyzed,and the eigenvalues and modal modes is obtained.Thereafter coMParing dynamic characteristics of the superstructure,the influence of the superstructure on the dynamic response of the gallery bridge is analyzed.5.Through applying the response spectrum seismic wave to the structural model and the load model,the internal force and displacement of the two models under various seismic conditions are compared,and the influence of the superstructure on the seismic performance of the bridge is studiedThrough the calculation and analysis above,the similarities and differences of mechanical properties between continuous rigid frame gallery bridge and conventional rigid frame bridge have been worked out,and the influence of the upper gallery structure on the static and dynamic characteristics of the lower bridge are obtained,which can provide reference for the seismic design of similar gallery bridges.