Research On The Stability,Static And Dynamic Characters And Monitoring And Evaluation Of Performance Of Long-span Cable-stayed Bridge

Cable-stayed bridge is a kind of bridge that connects the beam to the bridge tower with cables.It is a structural system composed of the bridge tower that mainly bears pressure,the beam body that bears bending moment and the cable that bears tension.Cable-stayed bridges are widely used in bridge construction due to their advantages of strong spanning capacity,large rigidity and various design shapes.Taking a bridge in Shandong province as the engineering background,this paper uses finite element analysis software MIDAS Civil 2019 to establish a finite element analysis model to comprehensively analyze and evaluate the cable-stayed bridge.This paper mainly studies the following aspects around the bridge:(1)This paper summarizes the development history,current situation and structural characteristics of cable-stayed bridges at home and abroad,and introduces the engineering background of a bridge in Shandong province.(2)Static calculation and analysis are carried out on the main girder,main tower and stay cables of the bridge,and the static performance of the bridge is verified according to the calculation results.(3)Eigenvalue analysis of the bridge is carried out to solve its natural vibration characteristics,and flutter stability analysis,response spectrum analysis and time history analysis are carried out in combination with the code.(4)Buckling analysis of the bridge is carried out to calculate the stability safety factor of the bridge under different working conditions.(5)According to the monitoring data of the bridge in the second quarter of 2019,the bridge is analyzed,and the safety performance of the bridge in structural temperature,structural strain,structural deformation,cable-stayed force and other aspects is evaluated by combining static and dynamic calculation analysis.Calculation and analysis show that the bridge meets the design requirements in static,dynamic and stability.The bridge monitoring results show that the bridge is in a safe and controllable state.This paper can provide reference for static and dynamic analysis,stability analysis and performance monitoring evaluation of similar long-span cable-stayed bridges.