Font Size: a A A

Parameter Sensitivity Analysis And Parameter Identification Of Long Span Steel Trussed Cable-Stayed Bridge

Posted on:2018-05-04Degree:MasterType:Thesis
Country:ChinaCandidate:C JiangFull Text:PDF
GTID:2382330548974640Subject:Civil engineering
Abstract/Summary:PDF Full Text Request
The bridge line and internal force of the long-span steel truss girder cable-stayed bridge are closely related to its construction control,due to the actual construction of the structure size?load value?construction environment and other uncertain factors,The final actual bridge line and the internal force are always deviate design values.the existence of this deviation will not only affect the closure of the bridge,but also affect the safety of the entire bridge.In this paper,the Beipanjiang Bridge is the engineering background,and the sensitivity analysis and parameter identification of the parameters that affect the behavior of the bridge are carried out.The main contents are as follows:(1)The full-bridge three-dimensional model is established by using the bridge finite element software Midas Civil.The sensitivity of the bridge structure is analyzed by changing the value of the different parameters in the reasonable parameter error variation space,and found the needs parameters of the influence on the behavior of the bridge.(2)According to the deviation between the actual elevation and the expected elevation,the least squares method is used to identify the error magnitude of the girder weight and cable force,and the identified parameters are substituted into the calculation model to obtain the linear error range after the parameter correction.(3)Aiming at the shortcomings of the least squares method in parameter identification,the two main sensitive parameters of the girder weight and the cable force are reused by using the response surface method,and the effect of the two sensitive parameters is coupled to facilitate the direct construction,and then to get directly to the actual construction to eliminate the error required to adjust the value of the cable.
Keywords/Search Tags:Steel trussed Cable-stayed Bridges, Construction control, Censitivity analysis, Parameter identification, Least square method, Response surface method
PDF Full Text Request
Related items