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为研究螺栓端板连接方钢管柱的承载力,进行了11个连接件的单调静力试验,分析了钢管和螺栓的3种典型破坏模式,以及钢管管壁厚度、螺栓列距与直径、盲孔螺栓Hollo-bolt构造等因素对连接件承载力的影响,提出了预测该类连接承载力的改进屈服线计算模型。研究结果表明:螺栓端板连接方钢管柱的破坏模式与钢管管壁厚度以及螺栓列距相关,承载力随钢管厚度以及螺栓列距和直径的增大而增大;通过连接件整体位移和钢管管壁连接面竖向位移与荷载关系,按双线性屈服模型得出的承载力预测值与试验值相近;由连接件试验结果折算得到的预测结果可用于此类节点的屈服弯矩计算。基于屈服线理论建立的连接件承载力的计算模型的计算结果,与试验结果比较,二者吻合较好。
In order to study the bearing capacity of square steel columns with bolted end plates, the monotonic static tests of eleven connectors were carried out. Three typical failure modes of the steel pipes and bolts were analyzed, as well as the thickness of the pipe wall, the pitch and diameter of the bolts, Hole bolt Hollo-bolt structure and other factors on the bearing capacity of the connector, put forward to predict the bearing capacity of such an improved yield line calculation model. The results show that the failure mode of the steel pipe column with the bolt end plate is related to the thickness of the steel pipe wall and the distance between the bolts. The bearing capacity increases with the thickness of the steel pipe and the increase of the stud pitch and diameter. The relationship between the vertical displacement and the load on the connecting surface of the pipe wall and the predicted value of the bearing capacity obtained by the bilinear yielding model is similar to the experimental value. The prediction results obtained by the experimental results of the connector can be used to calculate the yield moment of such joints. The calculation results of the calculation model of the bearing capacity based on the yield line theory are in good agreement with the experimental results.