Wind Resistant Security On The The Transient Of Construction Of Slender Suspension Bridge With A Steel Truss Stiffened Girder

In this paper, according to the wind engineering problem of the wind resistance of the slender suspension bridge with steel truss stiffened girder, a comprehensive research topic involving the static wind stability, the dynamic characteristics and the flutter stability of the slender suspension bridge with steel truss stiffened girder is discussed. Also, focus on the heavy and difficult problem of long span bridge construction, which is the wind resistance of the transient of construction in this type of bridges. Since it is complex wind environment, long time for project and low stiffness in the construction of slender suspension bridge with steel truss stiffened girder is discussed, the wind effect which couldn’t occur in the end phrase of the construction will appear. Moreover, considering the safety and comfort of personnel and working time during the construction, therefore, it is significant to study the wind resistance of the transient of construction in this type of bridges. Based on the newly built Liu Jia Xia Bridge, Elaborated the wind resistance during the transient of construction of this bridge. The specific work is as follows:First, the development and the present status of wind engineering of bridge is narrated, also the research situation and the developing direction of static wind stability and the flutter stability is sketched at home and abroad.Second, describes theory and method of static wind stability, include how to describe non-linear static wind load. The three-dimensional finite element model of Liu Jia Xia Bridge is built. Use matrix iteration with Newton method research the overall process of the non-linear static wind instability of this bridge in ANSYS. At the same time, the static wind stability of the Liu Jia Xia Bridge is proved.Again, according to the Liu Jia Xia Bridge, the dynamic characteristics of the slender suspension bridge with steel truss stiffened girder is researched. Figure out the variation trend of dynamic characteristics in the end phrase or the transient of construction, to obtain the general rules of the variation of dynamic characteristics in construction phrases.And finally, by using APDL parametric program based on ANSYS finite element analysis tool, the flutter stability of the transient of construction and the effects of the hoisting plan is explored. Using flutter time domain analysis methods, to compare the results with the test results. Simultaneously, the method is turned out to be a feasible and correct way. Using several hoisting plan and Asymmetric plan, to make a contrast of the results of flutter stability in all kinds of plan. Thereby, the general rules of the variation of flutter critical wind speed in construction phrases and the measures to improve the flutter stability is obtain.