考虑恒载影响的结构动力分析方法研究
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摘要
研究目的:在结构的动力性能研究中,满足一定工程精度要求的结构动力响应模拟分析是实现结构分析真实性和准确性的基础和保证。在对结构进行动力响应分析时,恒载的初应力效应对结构后续响应的影响往往是不可忽略的。本文利用ANSYS软件,针对恒载作用下结构动力响应时程分析的方法进行探讨,以为非线性结构的动力响应分析提供指导作用。研究结论:线弹性结构的动力响应分析中可将静力反应结果与动力响应结果叠加得到总反应,而非线性结构在动力分析时应用叠加法不能得到结构的真实响应,有应力法和慢动力法对于考虑恒载影响的结构动力响应分析是有效的分析方法,前者将恒载与动力荷载分别放到稳态分析和瞬态分析里施加,后者的整个加载过程全部在瞬态分析中完成。两种方法均可应用于结构线弹性动力分析和非线性动力分析。
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.
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.
引文
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[9]刘文华.大跨复杂结构在多点地震动激励作用下的非线性反应分析[D].北京:北京交通大学,2007.Liu Wenhua.Nonlinear Response Analysis of Large-Span Complex Structures Under Specially VaryingEarthquake Ground Motions[D].Beijing:BeijingJiaotong University,2007.
[10]博弈创作室.APDL参数化有限元分析技术及其应用实例[M].北京:中国水利水电出版社,2004.Bo Yi Studio.Finite element analysis technology and itsapplications APDL parameters[M].Beijing:ChinaWater Power Press,2004.
[11]王呼佳,陈洪军,包陈.ANSYS工程分析进阶实例[M].北京:中国水利水电出版社,2006.Wang Hujia,Chen Hongjun,Bao Chen.Analysis ofAdvanced Example of ANSYS Project[M].Beijing:China Water Power Press,2006.
[2]王新敏.ANSYS工程结构数值分析[M].北京:人民交通出版社,2007.Wang Xinmin.ANSYS Numerical Analysis of EngineeringStructure[M].Beijing:China Communications Press,2007.
[3]范立础.桥梁抗震[M].上海:同济大学出版社,1997.Fan Lichu.Seismic Design of Bridge[M].Shanghai:Tongji University Press,1997.
[4]李岩,盛洪飞,黄新艺.大跨径斜拉桥动力分析基准有限元模型研究[J].公路交通科技,2006(9):58-62.Li Yan,Sheng Hongfei,Huang Xinyi.Research on theBaseline Finite Element Model for Dynamic Analysis ofLong Span Cable-stayed Bridge[J].Highway TrafficScience and Technology,2006(9):58-62.
[5]谢旭.桥梁结构地震响应分析与抗震设计[M].北京:人民交通出版社,2006.Xie Xu.Analysis of Seismic Response and Seismic Designof Bridge Structure[M].Beijing:ChinaCommunications Press,2006.
[6]罗飞.大跨度钢拱桥静力非线性及地震响应研究[D].北京:北京工业大学,2004.Luo Fei.Earthquake Response for the Long-span SteelArch Bridge[D].Beijing:Beijing University ofTechnology,2004.
[7]郭文华,陈代海,李整.二期恒载对大跨度斜拉桥车桥耦合振动的影响[J].中南大学学报(自然科学版),2011(8):2423-2428.Guo Wenhua,Chen Daihai,Li Zheng.Influence ofSecondary Dead Load on Vehicle-bridge CouplingVibration of Long-span Cable-stayed Bridges[J].Journal of Central South University(Natural ScienceEdition),2011(8):2423-2428.
[8]刘坤.新疆伊犁河大桥主桥地震响应分析[J].铁道工程学报,2012(6):59-64.Liu Kun.Analysis of Seismic Response of Main Bridgeof Yili River Bridge[J].Journal of Railway EngineeringSociety,2012(6):59-64.
[9]刘文华.大跨复杂结构在多点地震动激励作用下的非线性反应分析[D].北京:北京交通大学,2007.Liu Wenhua.Nonlinear Response Analysis of Large-Span Complex Structures Under Specially VaryingEarthquake Ground Motions[D].Beijing:BeijingJiaotong University,2007.
[10]博弈创作室.APDL参数化有限元分析技术及其应用实例[M].北京:中国水利水电出版社,2004.Bo Yi Studio.Finite element analysis technology and itsapplications APDL parameters[M].Beijing:ChinaWater Power Press,2004.
[11]王呼佳,陈洪军,包陈.ANSYS工程分析进阶实例[M].北京:中国水利水电出版社,2006.Wang Hujia,Chen Hongjun,Bao Chen.Analysis ofAdvanced Example of ANSYS Project[M].Beijing:China Water Power Press,2006.
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