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超大承载力端板连接节点是一种新型梁柱节点形式,可以应用于大跨或重载钢框架中。在抗震区框架中梁柱节点除承担弯矩之外还可能承担一定的拉力,因此有必要对超大承载力端板连接节点的抗拉性能进行研究。对4个采用不同端板厚度、螺栓直径或螺栓布置形式的超大承载力端板连接节点足尺试件进行了轴拉荷载下的试验研究,记录并分析了各螺栓轴向应变增量分布情况;建立了24个超大承载力端板连接节点的有限元模型并进一步分析了该节点的抗拉性能。基于试验研究和有限元分析的结果得出:在轴拉荷载下端板外伸段靠近梁翼缘中部的螺栓为最不利螺栓,而移除角部螺栓对节点的抗拉性能没有不利影响;提出了该节点受拉时等效受拉螺栓数量的建议计算式,并给出了节点抗拉承载力的设计方法。
Large capacity bearing plate connection node is a new type of beam and column joints, can be used in large span or heavy steel frame. Beam-to-column joints in the earthquake-resistant zone frame may bear a certain tensile force in addition to the bending moment, so it is necessary to study the tensile properties of the joint nodes of the super-large bearing capacity. Four full-scale specimens with different end plate thicknesses, bolt diameters or bolted arrangements were tested under axial load and the axial strain loading distributions were recorded and analyzed The finite element model of 24 joints of super-large bearing capacity end plate was established and the tensile performance of this joint was further analyzed. Based on the experimental study and finite element analysis, the results show that the bolts with the end-plate extension near the middle of the beam flange are the most unfavorable bolts under the axial load and the bolt with corner bolts has no adverse effect on the tensile properties of the joints. The calculation formula of equivalent bolt tension when tensioned is given, and the design method of joint tensile load capacity is given.