The Reliability Analysis of Bridge Structure under Multipoint Excitation

Abstract

With the large-scale development of China's economy and transportation in recent years, more and more long-span bridges are built and put into use. The scale of bridges becomes more and more big. The tower large span cable-stayed bridges are commonly seen. As one of the lifeline engineering, the seismic design and the reliability under seismic situation are particularly important. This paper first introduces the research situation and the theory of the reliability as well as some calculation methods used in the application of bridge reliability calculation. Based on the structure bearing capacity, the normal use of structure and structure system reliability, this paper explains the reliability process both at home and abroad. At the same time, this paper also discusses the response spectrum analysis method of the stochastic response of large span structure under the incentive function of multi-support seismic. In addition, this paper deduces multipoint excitation response spectrum combination formula according to the literature, and calculates the mean and standard de viation of the peak response of bridge structure. Finally, taking the cable-stayed bridge as an example, this paper establishes the analysis model, carries out the modal analysis, static analysis and dynamic analysis of bridges, and conducts the calculation analysis of bridge reliability under m ultipoint excitation based on the above methods.