Seismic Response Analysis Of Unsymmetrical Single Cable Plane Steel Box Girder Single Tower Cable-stayed Bridge

With the continuous development of my country’s economy,the proportion of the cablestayed bridge in the construction of large span bridges is getting bigger and bigger.As the transportation hub engineering and lifeline project,the bridge is easy to damage in the earthquake,which not only causes serious direct losses,but also increases the difficulty of earthquake relief,but also brings a huge threat to the people’s life and property,so research bridge seismic response It is very important.This paper takes the main viaduct bridge of Kunshan West Road-national Road 304 connecting line in Shenyang city as the research object.Midas Civil is used to establish the spatial finite element model of cable-stayed bridge,and the dynamic characteristics calculation and seismic response analysis are carried out.The main work and research contents of this paper are as follows:(1)Recalling the development of the Cable,the development and the development and research status of seismic response,and introduces the characteristics of the cablewide.(2)By summarizing previous studies,it is concluded that the common methods for seismic analysis of Bridges are static method,response spectrum method,time history analysis method and power spectrum method.The advantages and disadvantages of each method and the scope of application are further analyzed.Finally,response spectrum method and time history analysis method are selected as the main research methods in this paper.(3)Midas Civil is used to establish a spatial finite element model of a cable-stayed bridge with single cable plane and steel box girder.The simulation methods of the main girder,cable,boundary conditions,main tower and pier of the cable-stayed bridge are described in detail.The dynamic analysis is carried out to reveal the natural vibration characteristics of the bridge.(4)The response spectrum analysis of the finite element model was carried out by using the canonical acceleration response spectrum curve.The seismic response(longitudinal,lateral,vertical,vertical +0.67 vertical,lateral +0.67 vertical,vertical +0.67 vertical,lateral +0.67)of different combinations is calculated,summarized the seismic response of the cable-stayed bridge structure.(5)Taking the EL Centro wave as an example,the dynamic time history analysis is selected,and three earthquake waves are selected and dynamic time history analysis,and the internal force and displacement response peaks under combined excitation;final comparison analysis Reaction spectrometry and time course analysis.