Shear Behavior of Novel Demountable Bolted Shear Connector for Prefabricated Composite Beam

Abstract

Bolted shear connectors offer alternatives to achieve steel-concrete composite action instead of conventional welded headed studs especially for prefabricated constructions and demountable composite structures. This paper firstly proposed a new type of demountable steel-concrete bolted shear connectors based on the double-nut friction-grip high strength bolted connector, which modify the upper nut into conical locking nut. This paper performed ten full scale push-out tests to study shear behaviors of the developed new type of connectors. Testing parameters included bolt configuration, strength, diameter of bolts and strength of infilled grout. Test results indicate that shear behaviors and slip capacity of the conventional bolted connectors are significantly improved when the bolted connector incorporating with conical locking nut. The influences of these studied parameters on shear behaviour of novel bolted shear connectors are revealed and discussed. The developed novel demountable connector exhibits an average 25% improvement in ultimate shear resistance over conventional bolted connectors. Moreover, the shear stiffness of the developed bolted connectors is about six times of the conventional bolted connector through eliminating the clearance between steel flange hole and bolt shank.

Fatigue Experiment Study on Internal Force Redistribution in the Negative Moment Zone of Steel–Concrete Continuous Composite Box Beams

“…Compared with ordinary reinforced concrete beams, steel–concrete composite beams exhibit the advantages of light weight, small cross-section, good ductility, and high seismic resistance [ 1 , 2 , 3 ]. Since the 20th century, steel–concrete composite beams have been widely used in bridge structures [ 4 , 5 ]. In this engineering background, fatigue damage is one of the most important forms of damage to steel–concrete composite beams, as various kinds of damage to composite beams can occur during the fatigue process.…”

Shear Behaviour of Demountable Connections With Bolts and Headed Studs

“…Comparison between the response of friction-grip bolts and bolts with a coupler system with and without injected resin was made by Kozma et al [19]. Certain sophisticated solutions have been proposed recently as locking-nut and friction-based shear connectors [20][21][22], which should be mounted in conical holes cut in a beam flange. Also, a system made of T-bolts and clamps was experimentally investigated [23].…”