钢桥管桁架新型螺栓连接节点抗拉性能试验研究OA

Aiming at the problems of low efficiency and poor mobility of bolt connection of steel pipe truss bridge,a new type of joint structure which can realize full bolt connection of pipe truss is proposed.Through the combination of model test and theoretical analysis,the tensile performance of the new bolted joint was studied.The results show that there are four failure modes of this type of connection:tube wall yield,tube wall yield accompanied by bolt hole punching,end plate yield and bolt failure.Under the failure modes of tube wall yielding,tube wall yielding with bolt hole punching and end plate yielding,the tensile yield strength and ultimate tensile strength of T-shaped square neck unilateral bolt connection with vertical and horizontal bolt holes are lower than those of traditional high-strength bolt connection.For different failure modes,the corresponding design method of T-shaped square neck unilateral bolt connection is proposed,and the modified Gomes model is recommended to calculate the yield bearing capacity of the pipe wall.The research conclusions provide a theoretical basis for bolted connections between truss web members and square steel chord members.