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现行设计规范规程要求对某些特定建筑物进行非比例倒塌性能分析。该分析采用一种使承重单元退出工作的分析方法实现。然而最近的研究集中在刚性连接节点钢框架的强度及其在承重单元局部破坏下维持整体性的能力,很少有对部分约束弱连接节点钢框架强度的研究。通过螺栓T型连接结构承重柱的破坏分析,研究部分约束钢框架的性能。提出了一个螺栓T型连接的宏模型,该模型用于非线性分析,并用试验结果对模型分析结果进行验证。将宏模型用于非线性有限元模型的建立,评估部分约束框架性能。研究了2个T型连接,其中一个试件的梁弯矩能力达到承载能力。研究目的是模拟不同跨度的典型办公楼楼层。结果表明:强连接的框架在底层柱破坏后还能维持整体性不至于倒塌,而弱连接的强度则不如强连接的。
Current codes of practice specifications require non-proportional collapse analysis of certain buildings. This analysis uses an analytical method that allows the load cell to exit work. However, recent studies have focused on the strength of steel frames with rigid connection nodes and their ability to maintain integrity under partial failure of load-bearing elements, and few studies have been conducted on the strength of steel frames partially restraining weakly connected nodes. Through the failure analysis of the load-bearing column of the T-shaped bolt connection, the performance of the steel frame is partially restrained. A macro model of bolt T-joint is proposed. The model is used for nonlinear analysis and the result of model analysis is validated by the test results. The macro model is used to establish the nonlinear finite element model to evaluate the performance of some constrained frames. Two T-joints were studied, in which the beam bending moment of one of the specimens reached its load carrying capacity. The purpose of the study was to simulate the typical office floors of different spans. The results show that the strength of the weakly connected frame is not as strong as that of the strong connected frame, even after the collapse of the bottom column.