钢筋混凝土梁柱子结构抗倒塌承载能力研究

Study of the Collapse-resistant Capacity of RC Beam-column Substructures

国外现有抗倒塌设计规范通过限制悬索体系的最大变形来防止连续倒塌的发生,往往导致不安全。就钢筋混凝土梁柱子结构倒塌变形过程进行分析,总结了悬链线破坏模式。通过对子结构抗倒塌承载能力的研究,提出了以钢筋达到极限强度为子结构倒塌极限状态,进而提出了基于悬链线抗拉承载能力的子结构抗倒塌设计方法,并对钢筋的抗倒塌设计强度进行了初步的讨论。

The existing foreign design code for progressive collapse（PC） are unsafe because of they restrict the progressive collapse by limiting the maximum deformation of catenary system.In this paper,the deformation process of RC beam-column substructures in collapse process are analyzed,and the two modes of catenary mechanism are summarized.A new collapse limit state based on the ultimate strength of steel is proposed by analyzing the bearing capacity of progressive collapse.And then,the PC design method of RC beam-column substructures based on tensile capacity of catenary,and also the preliminary discussions about tensile strength of steel are given.