Tensile test study of high-strength steel plate single-sided bolted steel connections considering construction deviation
In order to study the tensile performance of high-strength steel plate single-sided bolted steel connections considering construction deviation,the monotonic tensile tests were conducted for 26 specimens.The study variables included bolt strength grades,steel bar diameters,preloads,anchorage lengths,steel bar axis deviation,and relative turning angle of steel bar.The failure mode,load-displacement curves,ultimate bearing capacity and deformation capacity of connection were analyzed.The results show that three types of steel bars with different diameters all exhibit two types of failure phenomena:steel bar breakage and plow trench pull-out.When four 12.9 grade bolts are used for the connection,the critical anchorage length of 12 mm diameter steel bars is between 4d and 5d(d is the diameter of steel bar).For the 14 mm diameter bars,the 12.9 grade bolts are difficult to work well,and the damage is all in the form of pullout damage.It is recommended to use 6 bolts to achieve equal strength connection when connecting steel bars with diameter of 12 mm and 14 mm.When the anchorage length is same,increasing the preload or increasing the strength of the bolts can effectively improve the tensile strength of the joint.When using bolts of grade 14.9,the anchorage length of the steel bar with diameter of 14 mm is between 3d and 4d.Under the same anchorage length and preload conditions,when the relative angle is 45°,the connector exhibits pull-out failure,while 0°and 90°both exhibit tensile failure.Under the same conditions,the anchorage length increases and the ultimate load capacity decreases for wide slotted connectors compared with narrow slotted connectors,so it is recommended to increase the thickness of cover to give full play to the performance of connectors.
万方数据
维普
