Study On The Seismic Response Of Partially Cable-Stayed Bridge With Corrugated Steel Webs Under Multi-dimensional Ground Motion

China is a country with frequent earthquakes.With the popularization and application of the new type of partially cable-stayed bridge with corrugated steel webs in China,it will inevitably be threatened by near-field pulse ground motion and far-field class harmonic ground motion.However,there are few researches on the seismic response of the partially cable-stayed bridge with corrugated steel webs under the action of near-field pulse ground motion and far-field class harmonic ground motion at home and abroad,so it is of great significance to study the seismic response of the partially cable-stayed bridge with corrugated steel webs under the action of near-field pulse ground motion and far-field class harmonic ground motion.Based on the engineering background of a partially cable-stayed bridge with corrugated steel webs in China,this paper studies the change of the peak acceleration of the input ground motion and the influence of different types of ground motion on the seismic response of the partially cable-stayed bridge with corrugated steel webs.It mainly includes the following work:(1)This paper discusses the seismic damage of bridge structure and its causes,from two aspects of partially cable-stayed bridge and prestressed concrete box girder with corrugated steel webs,it introduces the characteristics and research status of partially cable-stayed bridge with corrugated steel webs,summarizes the characteristics of near field vibration and far field vibration and the research status of the bridge under these two kinds of seismic actions,at the same time,the seismic response analysis methods of bridge structures are summarized,and the advantages and disadvantages of each method and its application scope are summarized.(2)In this paper,the modeling method of the partially cable-stayed bridge with corrugated steel webs is studied,on this basis,the spatial finite element model of a partially cable-stayed bridge with corrugated steel webs is established by using Midas-Civil software,and its dynamic characteristics are analyzed,according to the relevant codes and wave selection principles,the near-field pulse,general field and far-field class harmonic ground motion are selected from the strong earthquake database of the pacific seismic engineering research center of the United States,there are 7 groups for each type.(3)Based on the change of seismic parameters at the bridge site from 6 degrees 0.05g to 7 degrees 0.10g in the new generation of "China ground motion parameter zoning map"(GB 18306-2015),the influence of the change of the input seismic peak acceleration on the seismic response of the partially cable-stayed bridge with corrugated steel webs is studied by adjusting the peak acceleration of the general field ground motion.The results show that the change of the input seismic peak acceleration has a great influence on the seismic response of the bridge in this paper,but the bridge can still meet the seismic performance requirements under the current code.(4)The nonlinear time history analysis of partially cable-stayed bridge with corrugated steel webs under uniform excitation is carried out by using near-field pulse,general field and far-field class harmonic ground motion,and the difference of seismic response of partially cable-stayed bridge with corrugated steel webs under different types of ground motion is studied.The results show that compared with the general field ground motion and the far-field class harmonic ground motion,the pulse characteristics of near-field pulse ground motion have a significant increasing effect on the seismic response of partially cable-stayed bridges with corrugated steel webs.