The Vibration Response Analysis Of Long Span Cable-stayed Bridge

With the development of transport facilities, large-span prestressed concrete cable-stayed bridge has been widely used in the field of highway bridges. Cable-stayed bridge across its superior capabilities and advantages of growing their own good to the long-span direction.At the same time, the earthquake in China is more than one country, under the earthquake as the lifeblood of the bridge project is one of the destruction of the structure will increase the secondary disasters, leading to more serious life and property and economic losses.To this end, the study of the seismic response of bridge hands is a reasonable seismic system, adopt effective measures to scientific earthquake.In this paper, the results of the study at home and abroad on the basis of the Yangtze River Bridge in Yibin, Sichuan background for the engineering of large-span cable-stayed bridge seismic response of a study of the following areas:(1) First analysis of the current seismic design of long-span cable-stayed bridge of the status quo, pointing out that the need for seismic response analysis; Sichuan Yibin and then analyzed the dynamic characteristics of Yangtze River Bridge, and then according to the Yangtze River Bridge, Sichuan Yibin seismic sites Department regional and national norms on the the similarities and differences between the vertical seismic input, respectively, a norm elastic response spectrum analysis and dynamic time-history analysis, summarized in the direction of vibration input to the continuous rigid frame bridge structure of some of the effects of calculation results.(2)The use of finite element analysis software MIDAS, through appropriate to simplify the structure of the establishment of cable-stayed bridge for dynamic analysis model as the basis for a soil pile in considering the case of the role of the calculation of the vibration characteristics of cable-stayed bridge.(3)Analysis of large-span cable-stayed bridge in the same seismic response under the incentive to explore the one-dimensional input, two-dimensional input, three-dimensional structure in response to input on the impact of the bridge.(4) Study to consider traveling wave in the cable-stayed bridge under the effect of the earthquake response, the use of massive acceleration law into force when the time, the restrictions on the bearing, the consideration of the structure of traveling wave effect of time-history analysis. Finally, the same structure in the non-uniform excitation of the response under uniform excitation in the reaction under the comparison of seismic response of long-span cable-stayed bridges in different seismic excitation changes.(5) Push-over analysis method introduced the application of the current situation and the basic principles of Yibin, Sichuan Yangtze River Bridge and a tower Push-over analysis and evaluation of seismic capacity, and finally analysis of the existing loading patterns and differences in non-linear analysis for the seismic design of engineering reference.