The Research Of Static And Dynamic And Sensitive Parameters Of Span Suspension Bridge

Today,people built a span bridge, the first choice is suspension bridges, the static and dynamic characteristics is the key of a suspension bridge design and construction. Theory and practice indicate that a strong non-linear suspension bridge, not simply a linear structure analysis methods. Scholars in the past, static and dynamic characteristics of suspension bridges, they often consider only some elements of the nonlinear suspension bridge. With the across rivers, canyons, the Strait of large span, the construction of large span suspension bridge, suspension bridge span-depth study of nonlinear static and dynamic characteristics of the whole become an extremely urgent task. In this paper, based on the results of existing research to build a long span suspension bridge in the background for the project, mainly for a bit of work:Firstly, through literature review, the paper described the suspension of computing theory and methods, through computing theory and methods of comparison and analysis, selected for large displacement of the suspension bridge with static and dynamic computing theory and methods.Secondly, the use of finite element software to establish a bridge full-bridge three-dimensional finite element model, the main cable under the bridge into a linear, finite element procedures of the bridge construction phase of the inverse analysis, the construction phase of each cable shape and eventually come to the main cable of the cable shape. Pre-saddle on the main partial volume analysis, the main construction phase of each saddle push push volume and stage.Thirdly, analysis of the vibration characteristics of the bridge, through the analysis of the bridge relatively long natural period, the first mode of the period to 12.588 seconds, indicating that the bridge has a strong flexibility, the seismic response of the bridge should not be using response spectrum method; first order symmetric vertical bending mode shape description for the vertical bending stiffness of the bridge is poor. Using dynamic time history analysis of the bridge's seismic performance. By analyzing the vertical along the bridge to the +, + Transverse to the artificial conditions of two vertical ground motion results showed that the vertical ground motion seismic design of structures can be controlled. Top in the main tower will withstand seismic loading have a greater bending moment, tensile stress will appear, seismic design should take note. Fourthly, using the finite element program, by changing the bridge's weight, temperature, stiffness and boundary conditions of the tower structure sensitive parameters, obtained by analyzing the results of these structural parameters on the linear span suspension bridge has a certain influence, the greatest impact on the deflection. The weight of each parameter in the structure of linear effects on the suspension bridge is the largest, followed by the temperature, relative to the weight and temperature, tower stiffness and linear boundary conditions on the suspension bridge was relatively small.