【摘要】 不锈钢材料具有较强的耐候性、良好的表观性、优异的力学性能，近年来在建筑结构中应用越来越广，且不断地向组合结构延伸．栓钉连接件是组合梁的重要组成部分，是实现混凝土板与钢梁共同工作的关键组件．然而，针对常温下和高温下不锈钢圆柱头栓钉抗剪连接件的受力性能研究尚不够充分，尤其是高温下连接件的荷载-滑移曲线更为缺乏．因此，为探究不锈钢圆柱头栓钉抗剪连接件受力性能，基于国产奥氏体S30408不锈钢材料，首先对常温下不锈钢圆柱头栓钉抗剪性能开展推出试验，获取其破坏模式和荷载-滑移曲线．在此基础上，通过有限元软件ABAQUS，建立了圆柱头栓钉的精细化有限元分析模型，对其常温下和高温下抗剪性能开展了数值模拟分析，且通过已有试验结果验证了有限元模型的准确性．最后，基于已验证的有限元模型，采用相继热力耦合分析方法，对不锈钢圆柱头栓钉抗剪性能开展了抗火分析，揭示了其火灾下的破坏过程和破坏机理，获得了圆柱头栓钉连接件在不同温度条件下的荷载-滑移曲线，为后续不锈钢-混凝土组合梁抗火性能分析提供重要的依据．更多还原

【Abstract】 With strong weatherability,good appearance,and excellent mechanical properties,stainless steel has been widely used in building structures and extended to composite structures in recent years. Stud connector is a vital component of a composite beam,which is important in realizing the joint work of concrete slab and steel beam.However,research on the shear resistance of stainless steel cylindrical head stud shear connectors at room and high temperatures is insufficient,especially for the load-slip curve at high temperatures. Based on the domestic austenitic stainless steel S30408,the shear performance of the stainless steel stud was tested at room temperature,and its failure mode and load-slip curve were obtained. Following this test,the refined finite element analysis model of the cylindrical head stud was established via finite element software ABAQUS,and the numerical simulation analysis of the stud’s shear performance at room and high temperatures was conducted. Then,the accuracy of the finite element model was verified using the existing test results. Finally,based on the verified finite element model,the fire resistance analysis of the shear performance of the stainless steel stud at high temperatures was conducted using the sequential thermomechanical coupling analysis method. The failure process and mechanism under fire were revealed.The load-slip curves of cylindrical head stud connectors under different temperatures were obtained,which provided an important basis for the fire resistance analysis of stainless steel-concrete composite beams.更多还原