Experimental Evaluation and Analysis of the Serviceability of Combined Bolt-Welded Joints under Shear Force

The article presents the data of experimental studies of bolted, welded and combined bolt-welded joints in building steel structures. On the basis of the results obtained, conclusions are drawn about the serviceability of the combined bolt-welded connection, absorbing shear force. Experimental samples of combined bolt-welded joints are obtained as a result of reinforcement of bolted joints under load by flank angle welds. The possibility of joint operation of multistrain connections in the form of bolts of ordinary strength and welded joints has been experimentally confirmed. A quantitative assessment of the effectiveness of bolted connections reinforcement with welded seams in percent of increase in the load-bearing capacity of the combined bolt-welded connection specimens compared to the load-bearing capacity of separately bolted and welded specimens has been obtained. In addition, a quantitative assessment of the efficiency of joint operation of bolted links in a combined bolted-welded connection was obtained in the form of a fraction of the shear force perceived by bolted links after reinforcement of the connection, referred to the value of their design ultimate load. The above results of experimental studies were obtained for two groups of prototypes. The design of specimens of one group provided for the initial bolted connections for the realization of the limit state of bolt shear, and the other – the limit state of buckling of the hole edge by the bolt rod.