强化有限元剪力连接件的拔出数值模拟

摘要

剪力连接件的拔出过程伴随着混凝土的拉裂与扩展，为了准确模拟拔出过程中的非连续变形及剪力连接件抗拔承载力，本文采用基于强化有限元的无厚度CZM单元，以粘聚区域模型描述剪力连接件拔出过程裂纹的开裂与扩展。然后建立了剪力连接件拔出数值分析模型，对拔出过程连续－非连续变形进行模拟，得到了拔出过程的荷载位移曲线，剪力连接件的抗拔承载力以及拔出过程裂纹扩展形态。本文方法可以实现拔出过程混凝土裂纹起裂扩展的非连续变形的数值模拟。%During the pull⁃out process there exist concrete crack initiation and propagation. To accurately simulate discontinuous deformation of the pull⁃out process and calculate pull⁃out capacity of shear connectors, a zero⁃thickness cohesive interface element based on the enhanced finite element method was introduced in this paper. And cohesive zone model ( CZM) was used to describe the crack initiation and propagation of the pull⁃out process. Then numerical simulation analysis of a pull⁃out test model was carried out. Results showed load⁃displacement curves of the structure, pull⁃out capacity, and crack propagation patterns of the concrete slab. Discontinuous deformation numerical simulation has been realized.