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为研究受压焊接空心球节点火灾下的性能,利用高温试验炉,对不同空心球外径和壁厚、钢管外径和壁厚、钢材屈服强度和荷载比的6种受压焊接空心球节点试件进行了高温作用下的试验研究,得到了其在高温下的温度分布、位移特征和破坏形式,并研究了对其极限耐火时间的影响因素;根据欧洲规范,对受压焊接空心球节点高温作用下的性能进行了非线性有限元数值模拟,分析了节点的温度场分布规律和影响因素。通过分析高温作用下节点的位移变化特征,确定了其破坏模式;试验结果和有限元分析结果进行了对比,二者吻合较好。研究结果表明:增大焊接钢管壁厚和降低焊接空心球节点实际承受的荷载可以有效地延长受压焊接空心球节点的极限耐火时间;钢管根部是高温作用下受压焊接空心球节点的薄弱部位。
In order to study the performance of hollow welded hollow ball joints under fire conditions, six kinds of hollow welded hollow ball joints with different hollow outer diameter and wall thickness, outer diameter and wall thickness of steel tube, yield strength and load ratio of steel were tested by using high temperature test furnace. The experimental study under high temperature was carried out. The temperature distribution, displacement characteristics and failure modes at high temperature were obtained. The influencing factors on the ultimate refractory time were studied. According to the European standard, The nonlinear finite element numerical simulation of the performance under high temperature was carried out. The distribution law of the temperature field and the influencing factors were analyzed. By analyzing the characteristics of the displacement of the joint under the action of high temperature, the failure mode of the joint is confirmed. The experimental results and the results of the finite element analysis are in good agreement. The results show that increasing the wall thickness of welded steel pipe and reducing the actual load of welded hollow ball joints can effectively prolong the ultimate refractory time of hollow welded hollow ball joints. The root of steel pipe is the weak part of the welded hollow ball joints under high temperature .