The Geometric Nonlinearity Analysis Of A Single Pylon Cable-Stayed Bridge Without Backstays

Cable-stayed bridge without back-stays with beautiful appearance, is a kind of novel structure of cable-stayed bridge. It is the biggest characteristic is using tilt pylon weight not back-stays force to balance the gravity of main girder. At presenr, a lot of this bridge was built in urban bridge on the earth. In this paper, based on thorough study on existing research progeny of cable-stayed bridge without bck-stays, worksystems study on the geometrical nonlinearity,dynamic characteristics and seismic response. It will abundancerich research contents and help the further development of the bridge cable-stayed bridge without bck-stays.In this paper, a single-pylon cable-stayed bridge without back-stays for the engineering background, study geometrical nonlinearity of prestressed concrete single pylon cable-stayed bridge without back-stays. Main job is as follows:(1) Introduce the basic theory of geometric nonlinear analysis of cable-stayed bridge, Illustrates the impact of geometric nonlinearity of cable-stayed bridge three major factors :large displacement, stay cabls sag effect and bending and axial force of combination. Starting from these factors to calculate the single-pylon cable-stayed bridge without back-stays under dead load stage to consider the geometric non-linear static analysis at the time, and linear results were compared.(2) The seismic response characteristics and power issues of single-pylon cable-stayed bridge without back-stays were discussed. The use of finite element program to study its dynamic properties, including the free vibration frequency, the corresponding vibration mode characteristics. Based on the seismic response analysis of response spectra, time history analysis method, select the El-Centro wave seismic response analysis carried out. Came to the conclusion that some of the engineering design of useful conclusions, the paper work for the non-dorsal column tower cable-stayed bridge design and power analysis provides a reference.(3) Study some perameters such as cable-stayed , the main beam and tilt pylon. Analysis of these parameters on the cable-stayed bridge without back-stays vibration frequencies and mode shapes of the impact.(4) Fiber model was used to power full non-linear analysis of the bridge.