单边螺栓T型钢连接梁柱节点地震损伤性能评估

Seismic Damage Assessment of a Beam-to-Column Connection with Blind Bolts and T-stubs

随着装配式钢结构在建筑工程领域的应用日益广泛,单边螺栓连接作为一种高效、便捷的连接方式,逐渐受到业界的青睐。H型钢梁、方钢管柱通过T型钢连接件和单边螺栓连接技术形成新型装配式钢框架结构,梁柱节点作为整个框架体系的核心,其抗震性能对整体结构的影响至关重要。为评估单边螺栓T型钢连接梁柱节点在地震过程中的损伤情况,开展了4种不同刚度单边螺栓T型钢连接梁柱节点的拟静力试验。通过试验,获得了单边螺栓T型钢连接梁柱节点的破坏模式、滞回性能和初始转动刚度,分析了不同刚度的T型钢连接件对梁柱节点的破坏模式、抗弯承载能力和转动刚度退化的影响。采用考虑残余变形累积损伤修正的Park-Ang损伤指数模型研究了试验中节点的损伤演化规律,结果表明:所提出的地震损伤模型能够较好地反映单边螺栓T型钢连接梁柱节点的损伤演化过程与破坏程度,为该类梁柱连接节点的优化设计和安全评估提供了理论依据和实践经验。

With the increasing application of prefabricated steel structures in the construction engineering field,blind bolted connection is gradually favored by the industry as an efficient and convenient connection method.A new type of prefabricated steel frame structure is formed by connecting H-section beams and hollow section columns with T-stub connectors and blind bolted connection technology.As the core of the entire frame system,the seismic performance of beam-column joints is crucial to the overall structure.To evaluate the damage of beam-column joints which connected with blind bolts and T-stubs during earthquake,quasi-static tests on four beam-column joints with different stiffness of T-stub were carried out.The failure mode,hysteretic behavior and initial rotation stiffness of beam-column joints connected by blind bolts and T-stubs were obtained by experimental research and the effects of the different stiffness of T-stub on the failure mode,bending moment bearing capacity and stiffness degradation of beam-column joints were analyzed.The Park-Ang damage index model,which considering the cumulative damage correction of residual deformation was used to study the damage evolution law of the joints in the test.The results show that the seismic damage model proposed in this paper can better reflect the damage evolution process and damage degree of the beamcolumn joints with blind bolts and T-stubs,which provides a theoretical basis and practical experience for the optimal design and safety assessment of such beam-column joints.