Research On Static And Dynamic Performance Of Different Structural Systems Of 140 M+240 M+140 M Single Cable-Stayed Bridge

Cable-stayed bridge is a cable supported structure, which has been formed into different structures by different combinations between tower and beam and pier. For the static and dynamic performance of different systems are different, it is important to choose a reasonable system which can improve its performance. Take HEZE city Dan Yang road cable-stayed bridge for example and use Midas Civil software to establish different cable-stayed bridge models to study their static and dynamic performance. The main work is as follows:First, review the development of cable-stayed bridge based on the domestic and foreign literature and summarize the present study situation of the cable-stayed bridge and the problems to be solved.Second, study cable-stayed bridge static and dynamic calculation. Discuss the influence of nonlinear factors on the cable-stayed bridge and expound the determining method for reasonably forming the bridge on the basis of the influence matrix method.Third, establish different cable-stayed bridge model for structural simulation analysis and study the temperature influence on stress state. Results show that the internal force and deformation caused by temperature load should not be ignored.And the influence of temperature difference of system, cable beam and the sunshine on pylons and girder temperature gradient on the cable-stayed bridge are different.Half floating system is comparatively reasonable after the analysis of static mechanics performance of different cable-stayed bridge system under the action of load combination.Fourth, further research the dynamic characteristics of cable-stayed bridge in different system and estimate seismic responses of cable-stayed bridge by the response spectrum analysis method. Natural vibration frequency and vibration mode of different cable-stayed bridge structural system are obviously difference. Threemodels are highly variable under seismic action and half floating system is relatively rational aseismatic structure system concerning about displacement and internal force.