针对当前钢框架连续倒塌分析和设计上的不足，采用理论分析、模型试验和数值模拟相结合的方法，开展基于抗倒塌机制的空间钢框架抗力分析及设计方法研究：基于能量原理和稳定分析，构建空间钢框架抗倒塌机制的非线性力学模型，并就其破坏模式和作用机理进行深入分析，实现对其力学性能的完整描述，获得基于抗倒塌机制的构件抗力需求；以结构抗力需求为研究目标，探讨梁机制和悬链线机制下空间钢框架的静、动力分布规律，并考虑初始条件、梁柱系统、楼板系统等影响因素，通过分析结构的破坏模式及相应的抗倒塌机制性能特征，实现对结构抗力和构件抗力之间的关系描述；结合抗震设计，以抗倒塌机制的性能分析为基础，提出空间钢框架连续倒塌的设计方法。本项目可对空间钢框架抗连续倒塌能力进行分析和评价，促进了建筑结构连续倒塌研究的发展，具有重要的科学意义和应用价值。

In view of the current shortage of progressive collapse analysis and design of steel frame, theoretical analysis, model test and numerical simulation are combined and used to make the study on resistance analysis and design method of space steel frame based on the anti-collapse mechanism: Firstly, the nonlinear anti-collapse mechanism models of space steel frame are constructed based on energy principle and stability analysis, so their failure modes and mechanism of action should be further observed. After the complete description of their mechanical properties is realized, the component resistance demand is obtained. Secondly, make the structural resistance demand as research target, the static and dynamic distribution laws of space steel frame are explored for beam mechanism and catenary mechanism, considered the influencing factors such as initial conditions, beam column system, floor system. The structural failure modes and the performance characteristics of anti-collapse mechanism corresponding are obtained, and then the relationship between structural resistance and component resistance is described fully. Thirdly, combined with the seismic design, the design method of progressive collapse of space steel frame is put forward based on the performance analysis of anti-collapse mechanism. After this study, the progressive collapse resistance capacity of space steel frame could be analyzed and evaluated, which promote the development of progressive collapse of building structure. So this study has important scientific significance and application value.