Seismic Response Analysis Of Concrete Filled Steel Tube Arch Bridge Under Multi-support Excitation

The earthquake are still unable to accurately predict natural disasters so far and the occurrence of earthquakes will be a huge loss of life and property to the human being.For this reason,the study of earthquake at home and abroad has come to the attention of many engineering academics.When the earthquake occurs,the ground motion is a complex time-space process,the earthquake is disseminates outward by the earthquake wave form in which process there are not only the traveling wave effect,but also the coherent effect,location effect and so on so that structural foundation supporting place's earthquake processes are different.Therefore,in the seismic analysis of the structure,not only the earthquake motion spatial variability effect but also time effect should be taken into consideration and when the structural span is small,these effects may be also possibly small that the seismic response analysis can be carried out according to an analysis of uniform excitation.Along with the unceasing expansion of the structure span and the increasing spatial-time influence,the same input analysis of the structure can not meet the requirements that multi-point incentives input analysis must be taken into account especially for the Bridge structure.Because Bridge structure belongs to the larg span flexible structure,the earthquake incentive influence will be obvious and seisimic ground motion's space-time variability will become increasingly significant.Therefore,multi-points incentive influence should be considered in the seismic design of large-span bridge structure.This article take the Fujian Putian extravagant mouth bridge as an example,the main content of this article involves the following:1.Based on the example,uses the ANSYS software modeling to analyze its dynamic properties.2.Under the satisfaction of the consistent input requirement,use the direct acceleration method to validate the large mass method's correctness and usability and has completed the upholstery for the following multi-spot stimulate research.3.Use the large mass method to study the bridge under different visual wave velocity and decide the influence of traveling wave on it based on the comparison with the uniform incentive method.4.On the 99 meters span,develop 51 meters and 201 metres concrete-filled steel tubular arch bridge respectively.Study the influence rule of traveling wave effect to concrete-filled steel tubular arch bridge with the expansion of span.5.Adds the rubber support separately on the three kinds of span bridge head's right margin mentioned above to study its'variation conditions under traveling effect.