基于三参数模型的方钢管柱-H型梁单向螺栓端板连接节点承载力研究

Research on Bearing Capacity of One-way Bolted EndplateConnection Nodes Between Square Steel Tube Columnand H-beam Based on Three-parameters Model

单向螺栓可较好地解决封闭截面内使用普通螺栓带来的施工不便和焊缝连接易发生脆性断裂等问题。为探索方钢管柱与H型梁单向螺栓端板连接节点的承载性能和影响因素,分别对梁柱平齐式端板连接节点和梁柱外伸式端板连接节点进行静力加载试验。试验通过校准有限元模型,发现两组数据吻合度较高,对此通过改变方钢管柱、H型梁和端板的截面参数与单向螺栓的直径建立了有限元模型进行承载力分析。研究结果表明:梁高度、柱壁厚度和螺栓直径对梁柱平齐式端板连接节点和梁柱外伸式端板连接节点的初始刚度和极限弯矩都有较大影响;梁柱外伸式端板连接节点的初始刚度和极限弯矩还受端板的宽度和厚度的影响。最后基于三参数模型拟合出初始刚度、极限弯矩和形状系数的近似公式,为此类节点在工程中的应用提供了参考。

One-way bolts can effectively solve the problems of construction inconvenience caused by using ordinary bolts in closed sections and brittle fracture of welded connections.In order to explore the bearing capacity and influencing factors of the one-way bolt end plate connection node between square steel tube column and H-beam,static loading tests were carried out on the beam-column flush end plate connection node and the beam-column extended end plate connection node.The test calibrated the finite element model and found that the two sets of data had a high degree of consistency.For this,a finite element model was established by changing the cross-sectional parameters of the square steel tube column,H-beam and end plate and the diameter of the one-way bolt to analyze the bearing capacity.The research results show that the beam height,column wall thickness and bolt diameter have a great influence on the initial stiffness and ultimate bending moment of the beam-column flush end plate connection node and the beam-column extended end plate connection node.In addition,the initial stiffness and ultimate bending moment of the beam-co-lumn extended end plate connection node are also affected by the width and thickness of the end plate.Finally,the approximate formulas of the initial stiffness,ultimate bending moment and shape coefficient were fitted based on the three-parameter model,which provides a reference for the application of such nodes in engineering.