钢管结构法兰连接节点抗弯承载性能的试验研究

研究了钢管结构法兰连接节点的抗弯承载性能.通过试验方法，采用螺栓应变测量装置，对含4种基本形式的法兰连接节点的试件进行四点弯加载试验，考察了在节点受弯过程中螺栓和法兰板的受力特性.试验得到了其屈服荷载与极限荷载，并且与相应的有限元分析结果吻合良好.试验结果表明，法兰连接节点的受拉区存在明显的撬力作用，刚性法兰连接节点的撬力作用小于柔性法兰连接节点.法兰连接节点的安全储备约为1.2.

Experimental Study on Flange-plate Connections of Steel Tubular Structures under Bending Moments

The bending load performance of flange-plate connections in steel tubular structures was studied. By using experimental methods and related bolt strain measurement device, four specimens containing different types of flange-plate connections were four-point bended with loading instruments. The mechanic features of bolts and flange-plates were monitored. The yield loading capacity and ultimate loading capacity of the connections were found and compared with the results obtained in the FEM method. It has been proved that they are identical with each other. The experiment results have revealed that the prying forces in the tensile region of flange-plate connections do exist, and the prying action of connections with a stiffener is stronger than that of connections without a stiffener. The safety margin of the connections is approximately 1.2.