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《Journal of Railway Engineering Society》 2013-06
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Research on Analysis Methods for Structural Dynamics on Considering the Effect of Constant Loads

ZHANG Ran1,WANG Xin-min2(1.The Third Railway Survey and Design Institute Group Corporation,Tianjin 300142,China;2.Structural Heath Monitoring and Control Institute,Shijiazhuang Tiedao University,Shijiazhuang 050043,China)  
Research purposes: When doing the research on the structural dynamic characteristics,the simulation analysis of the structural dynamic response that meets the engineering accuracy requirements is crucial to achieving the reality and veracity of the structure analysis.When making the analysis of the structural dynamic response,the effect of initial stress derived from constant loads on the later performances can not be neglected.For example,the increase of self-weight of the bridge can be seen as the reduction of the proportion of the vehicle weight in the whole system,resulting in reduction of the impact of vehicle on the bridge.This paper researches and discusses the time-history analysis method for the response of structures under constant loads with the ANSYS software and presents two feasible methods of the stress-inputting method and slow dynamic method.These methods has the guidance meaning for the time-history analysis of nonlinear structures. Research conclusions:In analysis of linear elastic structures,the final result can be obtain by superposition of the static response and dynamic response.Whereas for the nonlinear structures,with superposition,the truth can not be got.The stress-inputting method and slow dynamic method presented in this paper are feasible and applicable for dynamic response analysis of structures affected by constant loads.With the former,the dead loads and dynamic loads shall be put together in the steady-state analysis and transient analysis respectively.With the later,the both loads will be put together in the transient stage.The two methods can be applied in both linear elastic dynamic analysis and nonlinear dynamic analyses.
【CateGory Index】: TU311.3
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