Abstract
High-strength bolted shear connectors (HSBSCs), which can be demounted easily and efficiently during deconstruction, are recommended to replace the conventional steel studs in steel–concrete composite beams (SCCBs) to meet the requirements of sustainable development. The existing investigations on the behavior of HSBSCs mainly focus on the positive moment area of composite beams, in which the concrete slab is in compress condition. In this paper, a three-dimensional finite element model (FEM) was developed to investigate the performance of HSBSCs subjected to inverse push-off loading. Material nonlinearities and the interactions among all components were included in the FEM. The accuracy and reliability of the proposed FEM were initially validated against the available push-off test results. Load-carrying capacity and load–slip response of the HSBSCs under inverse push-off loading were further studied by the verified FEM. A parametric study was carried out to determine the influence of the concrete strength, the diameter and tensile strength of bolt and the clearance between the concrete slab and the bolt as well as the bolt pretension on the shear performance of HSBSCs. Based on the extensive parametric analyses, design recommendations for estimating the shear load at the first slip and load-bearing resistance of HSBSCs were proposed and verified.
Highlights
Steel–concrete composite structures such as steel–concrete composite beams (SCCBs) have been widely used in civil engineering construction as they take full advantage of both materials
Highstrength bolts with outstanding characteristics are usually employed in steel structures because the connection fasteners can be utilized as the demountable mechanical shear connectors to substitute the headed studs in SCCBs
The results showed that the shear capacity of bolted shear connections is more excellent than that of steel studs
Summary
Steel–concrete composite structures such as steel–concrete composite beams (SCCBs) have been widely used in civil engineering construction as they take full advantage of both materials. Among the various kinds of mechanical shear connectors, welded headed studs are the most common one because of their convenient construction, favorable mechanical properties and comprehensive research achievements [1,2,3,4,5,6,7]. From the perspective of sustainable development, conventional SCCBs, of which the steel studs are welded on the top of the steel beams and cast into concrete slabs, are complicated and inefficient to disassemble and reuse in the process of building replacement, rehabilitation or strengthening. Highstrength bolts with outstanding characteristics (i.e., fatigue performance, tight connection and convenience for dismantling) are usually employed in steel structures because the connection fasteners can be utilized as the demountable mechanical shear connectors to substitute the headed studs in SCCBs. Several studies have reported SCCBs by applying
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