地震作用下端板连接的特性
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摘要
试验测试了循环荷载作用下的一组8个足尺的钢梁柱端板连接弯矩。研究的参数有端板厚度、螺钉直径、外伸端板加劲肋、柱加劲肋、齐平/外伸端板的类型。试验结果反映在弯矩能力曲线、转角刚度、转动能力和滞回曲线上。试验结果显示:延伸的端板连接有足够的强度、节点转动刚度、延性和抗震结构中要求的耗能能力。基于试验结果和分析,提出了在钢结构抗震设计中对端板连接弯矩的一些详细要求,为保证在地震作用下端板连接能够提供足够的转动能力和耗能能力,并使最终破坏模式为延性破坏,推荐了三种失效模式和相应的抵抗能力。为考虑端板连接向两侧延伸,本文还提出了一种双线性的运动硬化弯矩-转角(M-R)滞回模型。
A series of eight full-scale structural steel beam-to-column end-plate moment connection specimens was tested under cyclic loads.The parameters investigated were end-plate thickness,bolt diameter,end-plate extended stiffener,column stiffener,type of flush and extended end-plate.The experimental results are presented in terms of moment capacity,rotational stiffness,rotation capacity and hysteretic curves.The test results indicate that extended end-plate connections have adequate strength,joint rotational stiffness,ductility and energy dissipation capacity required for use in seismic moment frames.Based on the test results and analysis,details on end-plate moment connections for seismic steel frames has been proposed,three failure mode requirements and the corresponding resistance have been recommended to assure that the end-plate connection can provide enough rotation capacity and energy dissipation capacity under earthquake loading and its ultimate failure mode is ductile.A bilinear kinematic hardening hysteretic moment-rotation(M-R)model for the end-plate connection extended on both sides has been proposed.
A series of eight full-scale structural steel beam-to-column end-plate moment connection specimens was tested under cyclic loads.The parameters investigated were end-plate thickness,bolt diameter,end-plate extended stiffener,column stiffener,type of flush and extended end-plate.The experimental results are presented in terms of moment capacity,rotational stiffness,rotation capacity and hysteretic curves.The test results indicate that extended end-plate connections have adequate strength,joint rotational stiffness,ductility and energy dissipation capacity required for use in seismic moment frames.Based on the test results and analysis,details on end-plate moment connections for seismic steel frames has been proposed,three failure mode requirements and the corresponding resistance have been recommended to assure that the end-plate connection can provide enough rotation capacity and energy dissipation capacity under earthquake loading and its ultimate failure mode is ductile.A bilinear kinematic hardening hysteretic moment-rotation(M-R)model for the end-plate connection extended on both sides has been proposed.
引文
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