| The influence of spatial variation of seismic ground motion on Long-span Spatial structures can't be neglected. This article researches the structure analysis model and the method under themulti- spots input on this topic, and propose some appropriate methods, then has carried on the multi-spots input earthquake time interval analysis with this analysis method to the actual engineering structures, and makes the contrast with structure response under the consistent input, obtains the structures's response under the multi-spots input. This article starts from the following several aspects:1)Structure under multi-spots seismic motion drive function time interval response analysis model. This article works from the structure equation of static equilibrium embarks, according the difference of the base vibration time interval and the structure moves when the support changes as necessary the dynamic equilibrium equation, and summarizes and introduces the structure earthquake response under the multi-spots drive function the time interval analysis four kind of models.2)The research of the mechanical analysis method of displacement load, this chapter starts from three aspects which are the time length of stride, the quality participation coefficient, the inspiring interception to uses the displacement load to make when input exists to carry on the summary, and will propose the improvement method3)The response analysis of long-span spatial structures under multi- spots seismic motion . This article takes two great spans structures as the example the influence to research response of the structure according to the different operating mode to the seismic motion traveling wave effect.Then suggest the span of the structure of the smallest with example one.The research in the paper laid the foundation for further research on the seismic design method and seismic performance of long-span spatial structure under themulti- spots input.
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