项目名称: 局部火灾下钢管混凝土组合框架连续倒塌机理与设防对策
项目编号: No.51268038
项目类型: 地区科学基金项目
立项/批准年度: 2013
项目学科: 建筑科学
项目作者: 王文达
作者单位: 兰州理工大学
项目金额: 50万元
中文摘要: 本课题研究局部火灾作用下钢管混凝土组合框架的连续倒塌机理及抗倒塌设防对策,考虑局部受火场景情况下可能的框架柱失效工况,对钢管混凝土组合框架结构体系在竖向荷载作用下连续倒塌性能及抗连续倒塌设防中的关键技术问题进行系统研究,包括以确定合理临界变形指标、屈服和倒塌破坏机制而进行的多层多跨钢管混凝土平面框架的倒塌试验及理论模拟、为考察不同节点连接形式对框架倒塌性能的影响而进行的组合节点抗倒塌性能试验及数值模拟、结合试验结果基于多尺度数值建模技术进行空间组合框架结构体系的非线性静力和动力时程分析、钢管混凝土组合框架抗倒塌设防对策与设计实用方法等。通过试验研究和理论分析,得到钢管混凝土组合框架抗连续倒塌设计中合理的临界变形限值和可能的倒塌机制等,明晰其倒塌机理,为进行此类结构抗连续倒塌设计提供依据和工程应用建议,为该类结构的推广应用提供参考。
中文关键词: 钢管混凝土;局部火灾;连续倒塌;工作机理;设计方法
英文摘要: The project will study the design strategy and progressive collapse mechanism of the composite frames with concrete-filled steel tubular (CFST) columns under local fire scenes. The key technology will be study systematically of the progressive collapse behavior and the design strategy of resisting progressive collapse of the composite frames under vertical loading when the columns can not support the upper structures because of the local fire attack. The detailed researches include several aspects. The experiment and numerical simulation of the multistoried composite frames investigate the critical derformation index, yielding and collapse mechanism of the plannar buildings. The experiment and numerical simulation of the different type composite joints study the influence about the collapse performance of the multistoried composite frames. The multiscale finite element model (FEM) with nonlinear static analysis and dynamic time history analysis will be carried out to simulate the behavior of the spatial composite frames based on the tested data. The design approaches and practical strategies will be presented to resist the progressive collapse of this type of structures. The reasonable critical deformation limitations and possible progressive collapse models should be obtained to design the composite frame struc
英文关键词: Concrete-filled steel tube;local fire scene;progressive collapse;mechanical mechanism;design method