The Static Behavior And Parameter Sensitivity Analysis Of Partial Cable-stayed Bridge With Corrugated Steel Webs

With the big development of bridges in China, lots of new bridge forms have been produced constantly. Partial cable-stayed with corrugated steel webs is a new bridge type composed of steel and concrete. It not only shows the beautiful appearance modeling, but it also takes full advantages of concrete compressive strength properties and high shear strength of the corrugated steel webs. It is a kind of economic, reasonable and efficient structure.For static and dynamic mechanical properties, design, construction of partial cable-stayed bridge in China, there are more research and analysis, but there is a little research and application related to the problems of partial cable-stayed with corrugated steel webs. Therefore, it is more significant to do further study and analysis of the structure mechanics behavior and parameter sensitivity on partial cable-stayed with corrugated steel webs for the design, construction and promotion about this bridge.This paper takes the Chaoyanggou reservoir bridge as the engineering background and does research on static analysis of the partial cable-stayed with corrugated steel webs. Firstly, a finite element model is built by finite element software Midas/Civil. Then, the stress performance of the structure is calculated and analyzed in each construction stage by means of construction process analog simulation, and it is used to check the original structure design. Thus the construction scheme is proved to be reasonable and feasible. The stressing state of the structure are analyzed emphatically in largest cantilever stage and finished stage.Secondly, the model is recalculated by changing the structural parameters relying on the static structural analysis. According to the results, parameter sensitivity analysis is carried out during the construction control process to access the sensitivity parameters. Next, the effect condition of girder alignment, internal force, stress and cable force will be combined with the state in which these parameters don’t change. The level of sensitivity which effects the structural state by these parameters is obtained. On this basis, the sensitive parameter and the insensitive parameter are divided.Finally, based on the cardinal principle and application method of parameter identification in the bridge construction control, the least square method is applied to identify relying on the results of sensitivity analysis. Then, the least square method is verified feasible in the construction control of partial cable-stayed bridge by comparing its result with the real value of parameters which are identified.