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在传统螺栓连接节点的基础上,提出一种可根据梁高在一定范围内调节节点连接高度的可变梁高装配式钢框架节点,适用于节点所连钢梁高度出现小范围变化时的情况。结合4个足尺试件在低周往复荷载作用下的试验研究及有限元分析,对采用不同L形连接件加强构造以及梁-柱连接对中方案时,节点的失效模式、滞回性能以及L形连接件的滑移情况进行了分析。结果表明,L形连接件的刚度将改变节点的受力性能,其椭圆螺栓孔构造会使节点在受力时产生一定的滑移,但该滑移对节点滞回性能的影响不明显;可忽略梁-柱连接对中方案对节点受力性能的影响;通过提高L形连接件的刚度,可使节点具有良好的滞回性能以及设计所期望的破坏模式;文中所采用的有限元分析方法可有效模拟节点滞回性能。该类节点可方便地应用于轻型装配式钢框架结构。
Based on the traditional bolted joints, a kind of variable-beam high-assembled steel frame node which can adjust the connection height of the nodes according to the height of the girder is proposed, which is suitable for the case where the height of the girder connected with the node changes in a small range . Combined with the experimental research and finite element analysis of four full-scale specimens under low cyclic loading, the failure mode, hysteretic behavior of the joints, The slip of the L-shaped connector was analyzed. The results show that the stiffness of the L-shaped connector will change the mechanical behavior of the joint. The elliptical bolt hole structure will cause some slip when the joint is stressed, but the slip has no obvious effect on the hysteretic behavior of the joint. Neglecting the influence of the beam-column connection alignment scheme on the mechanical behavior of the joint; and by improving the stiffness of the L-shaped joint, the node can have good hysteretic behavior and the desired failure mode. The finite element analysis It can effectively simulate node hysteresis. Such nodes can be easily applied to light assembly type steel frame structure.