基于广义结构刚度的构件重要性评价方法.pdfVIP

学兔兔 第27卷 第1期 建筑科学与工程学报 Vo1．27 NO．1 2010年3月 Journal of Architectureand Civil Engineering Mar．201O 文章编号：1673—2049(2010)O1—0001—06 基于广义结构刚度的构件重要性评价方法 叶列平，林旭川，曲 哲，陆新征，潘 鹏 (清华大学 土木工程系，北京 100084) 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。 关键词：结构安全性；构件重要性指标；广义结构刚度；传力路径；变形能 中图分类号：TU311．3 文献标志码：A Evaluating Method of Element Importance of Structural System Based on Generalized Structural Stiffness YE Lie—ping，LIN Xu—chuan，QU Zhe，LU Xin—zheng，PAN Peng (Department of Civil Engineering，Tsinghua University，Beijing 100084，China) Abstract：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