基于广义结构刚度的构件重要性评价方法
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摘要
总结了现有构件重要性评价指标的研究概况和工程经验;根据结构体系传力路径中传递荷载比例大的构件重要性大的思路,通过理论推导定义了考虑荷载作用的广义结构刚度;以拆除构件对广义结构刚度的影响程度作为该构件重要性评价指标,并进一步将该指标转化为结构变形能损失率,使该指标的概念更为清晰;采用该评价方法对1组框架结构分别在重力荷载和水平地震荷载作用下的构件重要性进行了分析。结果表明:该方法具有合理性,且便于计算,可用于大多数类型的结构。
A summary of existing researches and engineering experience on element importance in the structural systems were presented.Based on the consensus that elements transferring more loads in the load path were generally more important in the structural systems,the element importance index was defined as the change in generalized structural stiffness under a certain load pattern after removing the element from the system.Then,the generalized structural stiffness taking into account the load pattern was proposed as a basis for evaluating the element importance.This index was further expressed in terms of the rate of structural strain energy change.The element importances of a series of frame structures under gravity and horizontal seismic load were then evaluated by the proposed method.The results show that the method is rational,convenient for calculating,and applicable to most structures.
A summary of existing researches and engineering experience on element importance in the structural systems were presented.Based on the consensus that elements transferring more loads in the load path were generally more important in the structural systems,the element importance index was defined as the change in generalized structural stiffness under a certain load pattern after removing the element from the system.Then,the generalized structural stiffness taking into account the load pattern was proposed as a basis for evaluating the element importance.This index was further expressed in terms of the rate of structural strain energy change.The element importances of a series of frame structures under gravity and horizontal seismic load were then evaluated by the proposed method.The results show that the method is rational,convenient for calculating,and applicable to most structures.
引文
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[10]张誉,李立树.旧房可靠性的模糊综合评判[J].建筑结构学报,1997,18(5):12-20.ZHANG Yu,LI Li-shu.Fuzzy Comprehensive Evalu-ation of Reliability of Existing Building Structures[J].Journal of Building Structures,1997,18(5):12-20.
[11]季征宇,林少培.受损结构安全度模糊评估理论的建立[J].建筑结构学报,1995,16(2):51-57.JI Zheng-yu,LIN Shao-pei.Fuzzy Evaluation for Re-sidual Carrying Capacity of Damaged Structures[J].Journal of Building Structures,1995,16(2):51-57.
[12]GHARAIBEH E S,FRANGOPOL D M,ONOUFRI-OU T.Reliability-based Importance Assessment ofStructural Members with Applications to ComplexStructures[J].Computers and Structures,2002,80(12):1113-1131.
[2]叶列平,程光煜,陆新征,等.论结构抗震的鲁棒性[J].建筑结构,2008,38(6):11-15.YE Lie-ping,CHENG Guang-yu,LU Xin-zheng,et al.Introduction of Robustness for Seismic Struc-tures[J].Building Structure,2008,38(6):11-15.
[3]叶列平,曲哲,陆新征,等.提高建筑结构抗地震倒塌能力的设计思想与方法[J].建筑结构学报,2008,29(4):42-50.YE Lie-ping,QU Zhe,LU Xin-zheng,et al.CollapsePrevention of Building Structures:a Lesson form theWenchuan Earthquake[J].Journal of Building Struc-tures,2008,29(4):42-50.
[4]柳承茂,刘西拉.基于刚度的构件重要性评估及其与冗余度的关系[J].上海交通大学学报,2005,39(5):746-750.LIU Cheng-mao,LIU Xi-la.Stiffness-based Evalua-tion of Component Importance and Its Relationshipwith Redundancy[J].Journal of Shanghai JiaotongUniversity,2005,39(5):746-750.
[5]胡晓斌.新型多面体空间刚架结构抗连续倒塌性能研究[D].北京:清华大学,2007.HU Xiao-bin.Studies on the Progressive Collapse Re-sistant Behavior of the New Type Polyhedral SpaceFrame[D].Beijing:Tsinghua University,2007.
[6]张雷明,刘西拉.框架结构能量流网络及其初步应用[J].土木工程学报,2007,40(3):45-49.ZHANG Lei-ming,LIU Xi-la.Network of EnergyTransfer in Frame Structures and Its Preliminary Ap-plication[J].China Civil Engineering Journal,2007,40(3):45-49.
[7]NAFDAY A M.System Safety Performance Metricsfor Skeletal Structures[J].Journal of Structural Engin-eering,2008,134(3):499-504.
[8]AGARWAL J,BLOCKLEY D,WOODMAN N.Vul-nerability of 3-dimensional Trusses[J].StructuralSafety,2001,23(3):203-202.
[9]柳承茂,刘西拉.结构安全性综合评估方法的研究[J].四川建筑科学研究,2004,30(4):46-48.LIU Cheng-mao,LIU Xi-la.Study on the Comprehen-sive Assessment Method of Structural Reliability[J].Sichuan Building Science,2004,30(4):46-48.
[10]张誉,李立树.旧房可靠性的模糊综合评判[J].建筑结构学报,1997,18(5):12-20.ZHANG Yu,LI Li-shu.Fuzzy Comprehensive Evalu-ation of Reliability of Existing Building Structures[J].Journal of Building Structures,1997,18(5):12-20.
[11]季征宇,林少培.受损结构安全度模糊评估理论的建立[J].建筑结构学报,1995,16(2):51-57.JI Zheng-yu,LIN Shao-pei.Fuzzy Evaluation for Re-sidual Carrying Capacity of Damaged Structures[J].Journal of Building Structures,1995,16(2):51-57.
[12]GHARAIBEH E S,FRANGOPOL D M,ONOUFRI-OU T.Reliability-based Importance Assessment ofStructural Members with Applications to ComplexStructures[J].Computers and Structures,2002,80(12):1113-1131.
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