考虑初始几何缺陷的弦支穹顶结构预应力张拉失效模式及预警研究
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摘要
基于特征值屈曲分析理论,结合结构失效准则,针对弦支穹顶结构预应力张拉施工过程中的结构稳定承载力,提出基于有限单元法的特征值迭代法;采用该方法研究具有初始几何缺陷的弦支穹顶结构施工过程的失效模式,提出预应力张拉的失效判别方法及预警参数。计算发现:弦支穹顶结构预应力超张拉失效模式为网壳节点局部跳跃失稳引起整体结构失效,预警参数的下限为结构预应力超张拉下结构的屈曲临界荷载值。所提弦支穹顶结构失效模式和失效预警参数可为实际弦支穹顶结构预应力张拉施工的失效提供科学的预警、预防依据,保障施工安全。
Based on the eigenvalue buckling theory for structures combined with structural failure criterion,an eigenvalue iteration method was proposed for calculating stability capacity of suspen-domes with excessive prestress tension.Using the method,the suspen-domes stability capacity and failure modes under excess prestress tension were analyzed,and failure criterion for excessive prestress tension and early-warning parameters were educed in this paper.The results show that the failure mode is the suspen-dome structure failure caused by certain local nodes snap-through firstly and the lower limit value of the early-warning parameter range is the buckling critical load of the structure with excessive prestress tension.The failure modes and early-warning parameters proposed can be a base for early warning for or even preventing suspen-domes failure during prestress tension construction to assure the safety of construction.
Based on the eigenvalue buckling theory for structures combined with structural failure criterion,an eigenvalue iteration method was proposed for calculating stability capacity of suspen-domes with excessive prestress tension.Using the method,the suspen-domes stability capacity and failure modes under excess prestress tension were analyzed,and failure criterion for excessive prestress tension and early-warning parameters were educed in this paper.The results show that the failure mode is the suspen-dome structure failure caused by certain local nodes snap-through firstly and the lower limit value of the early-warning parameter range is the buckling critical load of the structure with excessive prestress tension.The failure modes and early-warning parameters proposed can be a base for early warning for or even preventing suspen-domes failure during prestress tension construction to assure the safety of construction.
引文
[1]全国建筑施工生产安全事故分析报告(2007年1月1日至6月30日).(2007-07-25)[2010-08-10]http://www.zjcic.net/NewsDetail.asp-D-ID=764
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[5]何键索杆体系的可靠性研究与施工模拟分析[D].杭州:浙江大学,2007(He Jian.Analysis reliability and construction stimulation for cable-strut system[D].Hangzhou:Zhejiang University,2007(in Chinese))
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[10]陈为.弦支穹顶结构稳定性分析[D].北京:北京工业大学,2007(Chen Wei.Dynamic stability analysis on suspendomes[D].Beijing:Beijing University of Technology,2007(in Chinese))
[11]刘学春,张爱林,葛家琪等.施工偏差随机分布对弦支穹顶结构整体稳定性影响的研究[J].建筑结构学报,2007,28(6):76-82(Liu Xuechun,Zhang Ailing,Ge Jiaqi.Study on the influence of construction deviation random distribution the integral stability of suspend-dome[J].Journal of Building Structures.2007,28(6):76-82(in Chinese))
[12]赵海峰,蒋迪.ANSYS8.0工程结构实例分析[M].北京:中国铁道出版社,2004
[13]刘慧娟.弦支穹顶结构施工过程模拟分析研究[D].上海:同济大学,2009(Liu Huijuan.Mechanical behavior simulation of suspen-domes during construction procedure[D].Shanghai:Tongji University,2009(in Chinese))
[2]郑志英.联方型单层球面网壳结构地震作用下的动力稳定性研究[D].北京:北京工业大学,2008(Zheng Zhiying.Analyse on dynamic stability of single-layer reticulated domes under seismic excitation[D].Beijing:Beijing University of Technology,2008(in Chinese))
[3]Chuan K.The basic theory of spatial structure design[J].Astigmatic Design and Case Design,Architectural Institute of Japan,2001
[4]李红雨.刚性屋面板索穹顶静动力性能研究[D].天津:天津大学,2007(Li Hongyu.Analysis on static and dynamic behavior of rigid roof cable dome[D].Tianjin:Tianjin University,2007(in Chinese))
[5]何键索杆体系的可靠性研究与施工模拟分析[D].杭州:浙江大学,2007(He Jian.Analysis reliability and construction stimulation for cable-strut system[D].Hangzhou:Zhejiang University,2007(in Chinese))
[6]付智强.弦支穹顶结构动力灾变研究[D].杭州:浙江大学,2008(Fu Zhiqiang.Time history of dynamic failure of suspend-domes.Hangzhou:Zhejiang University,2007(in Chinese))
[7]杨瑞刚.大型钢结构系统失效模式与系统可靠性研究[D].太原:太原科技大学,2004(Yang Ruigang.failure mode and reliability of large metal structure system[D].Taiyuan:Taiyuan Science and Technology University,2004(in Chinese))
[8]董聪.现代结构系统可靠性理论及其应用[M].北京:科学出版社,2001
[9]李政方.弦支穹顶结构的静力性能及稳定性分析[D].武汉:武汉理工大学,2009(Li Zhengfang.Static performance and stability analysis on suspendome[D].Wuhan:Wuhan University of Tecnoligy,2009(in Chinese))
[10]陈为.弦支穹顶结构稳定性分析[D].北京:北京工业大学,2007(Chen Wei.Dynamic stability analysis on suspendomes[D].Beijing:Beijing University of Technology,2007(in Chinese))
[11]刘学春,张爱林,葛家琪等.施工偏差随机分布对弦支穹顶结构整体稳定性影响的研究[J].建筑结构学报,2007,28(6):76-82(Liu Xuechun,Zhang Ailing,Ge Jiaqi.Study on the influence of construction deviation random distribution the integral stability of suspend-dome[J].Journal of Building Structures.2007,28(6):76-82(in Chinese))
[12]赵海峰,蒋迪.ANSYS8.0工程结构实例分析[M].北京:中国铁道出版社,2004
[13]刘慧娟.弦支穹顶结构施工过程模拟分析研究[D].上海:同济大学,2009(Liu Huijuan.Mechanical behavior simulation of suspen-domes during construction procedure[D].Shanghai:Tongji University,2009(in Chinese))
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