基于结构鲁棒性提升的隔板贯通节点加固构造

Retrofitted Connection Details of Through Diaphragm Joint for Structural Robustness Enhancement

摘要:

为提高结构的鲁棒性，针对传统矩形钢管柱隔板贯通式栓焊连接构造，提出了一种加固型栓焊盖板连接构造及其设计方法，并进行了数值模拟分析，该分析考虑了断裂模拟及裂后路径跟踪.结果表明，加固型栓焊盖板连接构造能够提高下翼缘连接区域传力失效前梁柱子结构的竖向变形能力，并充分发挥梁内轴向拉力产生的悬链线效应，进而使梁柱子结构提供更大的竖向承载力，可用于提高结构抗连续倒塌能力的加固改造.

关键词:钢框架结构; 隔板贯通式节点; 连接构造; 加固; 连续性倒塌; 鲁棒性

Abstract:

A kind of retrofitted bolt weld connection details and its corresponding design methods are proposed on the basis of the conventional RHS column joint with through diaphragm to meliorate structural robustness. With a view to material fracture and the path tracking after fracture, the numerical results indicate that the retrofitted bolt weld connection details can enhance the vertical deformation capacity of the beam column assemblies before the force transmission failure at the bottom of connection region, which is conductive to the development of catenary action by axial force in the beams. Therefore, the beam column assemblies can provide greater vertical carrying capacity and the connection details can be used in transforming structures against progressive collapse.

Key words:steel structure; through diaphragm joint; connection details; retrofit; progressive collapse; robustness