高冗余度钢框架体系优化设计研究

项目名称： 高冗余度钢框架体系优化设计研究

项目编号： No.50808116

项目类型： 青年科学基金项目

立项/批准年度： 2009

项目学科： 建筑科学

项目作者： 黄冀卓

作者单位： 福州大学

项目金额： 20万元

中文摘要： 在综合考虑构件在结构能量流分布中的贡献和构件失效影响面积的基础上，给出了构件重要性系数计算方法。提出了基于损伤模型的结构冗余度概念，并在此基础上给出了钢框架结构冗余度的定量评估计算指标。从定义上对结构冗余度与结构鲁棒性之间的差异进行了讨论，提出了以结构最小冗余度作为评价结构鲁棒性能的观点，并给出了一种适用于钢框架结构的鲁棒性评估方法。通过建模分析，探讨了偶然荷载作用下构件局部失效后的钢框架体系连续倒塌机理，研究了不同区域（或位置）的局部失效和局部失效区域的扩展对钢框架体系抗连续倒塌能力的影响。提出了一种高冗余度钢框架体系- - 部分预应力钢框架结构。研究了提高节点连接承载力冗余度的方法和构造措施，给出了框架柱的合理轴压比限值。探讨了高冗余度钢框架支撑体系拓扑优化设计的可行性。提出了高冗余度钢框架体系多目标优化模型，并在多目标优化算法研究的基础上探讨了高冗余度钢框架体系的多目标优化设计。探讨了不同钢框架体系间的冗余度差异。另外，为了提高计算效率，还提出了三种适用于大型结构发生参数大修改时的结构静力重分析方法。

中文关键词： 结构冗余度；结构鲁棒性；优化设计；钢框架

英文摘要： By considering the contributions of structural members to the structural energy distribution and the influence areas of localized damage of structural members, a method to calculate the importance indices of members is presented.A damage-based structural redundancy conception is proposed,and then a structural redundancy index of steel frames is brought forward based on the localized damage modes. The minimum of the structural redundancy indices is used to measure the robust performance of a steel frame after discussing the differences in definition between structural redundancy and structural robustness, and a quantitative assessment approach to structural robustness of steel frames in terms of damage mode based structural redundancy is proposed. Progressive collapse mechanisms of local damaged steel frames under abnormal loads are analyzed, and the effects of localized damage position and their diffusion on the progressive collapse-resisting capacity of steel frames are discussed. A high redundant steel frame- - -partial prestressed steel frame is proposed. Measures to improve the load capacity redundancies of connections are presented, and for prevention of progressive collapses, a limit of axial load utilization ratio of column under ordinary load is given. The feasibility of topology optimization design on high redundant braced steel frames is studied. The multiobjective optimization design of high redundant steel frames is explored based on research of a multiobjective optimization algorithm. The differences of structural redundancy between various types of steel frame systems are compared. In addition, to save the computational cost, three static reanalysis methods for large-scale structures with large modifications of structural parameters based on the Combined Approximation method are presented.

英文关键词： structural redundancy; structural robustness; optimal design; steel frame