基于能量法的半刚性钢框架连续倒塌抗力分析

ENERGY-BASED PROGRESSIVE COLLAPSE RESISTANCE ANALYSIS OF STEEL FRAME STRUCTURES WITH SEMI-RIGID CONNECTIONS

为研究半刚性钢框架结构的抗连续倒塌能力,基于能量法推导半刚性钢框架在连续倒塌工况下的抗力-位移曲线,得到各倒塌阶段的抗力表达式,从小变形状态下的梁机制和大变形状态下的悬链线机制分阶段研究半刚性钢框架结构的抗力性能;通过与已有试验的数据结果对比分析,验证了理论公式的可靠性.结果表明:提出的半刚性钢框架的连续倒塌抗力表达式计算过程简单,结果可靠,可实现对结构连续倒塌抗力的快速分析,为相关设计提供了依据.

In order to study the anti-progressive collapse capacity of steel frame structures with semi-rigid connections, the resistance-displacement curve of the steel frame structures under the progressive collapse condition is obtained based on an energy method, as well as the resistance expression at each stage. The performance of the steel frame structure is analyzed based on a beam mechanism in the small deformation state and a catenary mechanism in the large deformation state to prevent the occurrence of the progressive collapse.The reliability of the theoretical formula is verified by comparing with the experimental results of the existing experiments, and a good agreement is observed. It is shown that the progressive collapse resistance expression of the steel frame structures with semi-rigid connections is simple and the results are reliable, and it can be used in the rapid analysis of the progressive collapse resistance of steel frame structures in the related design.