Turnover Experimental Research on Anti-Slipping Performance of Steel Pipe Joints with Swivel Coupler

A series Anti-slipping tests on steel pipe joints with swivel coupler were carried out in this paper. Sixteen specimens after turnover loaded, were tested to investigate the influence of variations in the Fastener tightening torque (Tr, from 20 to 40N•m), fastener turnover frequency (N, from 10 to 50) and turnover loading amplitude (△P, from 4.0 to 8.0kN) on the anti-slipping performance of steel pipe joints with swivel coupler. The experimental results showed that, the anti-slipping ultimate strength and stiffness of specimens were increased first and then decreased with increasing Tr or N, and decreased with increasing △P. The swivel coupler turnover should not exceed the number of 20, and the force of diagonal bracing bearing should less than 6 kN.