Abstract
The most researches on steel-concrete-steel (SCS) sandwich slabs are to control the cracking of concrete core along with losing weight, and shear connector type. In this study, the behaviour of SCS slabs with bi-directional corrugated-strip shear connectors (CSC) was investigated. One of the most important practical problems of CSCs in SCS slabs is lack of access for another end welding to the second steel faceplate. In this research, plug weld was proposed to provide partial welding of the other end of CSCs to a steel plate. For this reason, three slabs were manufactured using the normal concrete core as a control sample and lightweight concrete (LWC) core with and without steel fibres. The behaviour of these slabs was compared with the behaviour of SCS slabs with J-hook and stud bolt connectors from previous researches. The specimens were tested under a concentrated block load as quasi-statically. Based on the load-displacement relationship at the centre, failure modes, loading capacity, energy absorption, and ductility showed acceptable behaviour for CSC system slabs. There was also a good agreement between the ultimate flexural strength based on experiments and previous research relationships.
Highlights
In order to increase the ratio of strength to weight of the structures and increase energy absorption, in recent years, the combination of concrete with steel faceplates has been considered by researchers.In this combination, a concrete piece can be mounted on a steel faceplate using a sufficient number of shear connectors [1], or a concrete core can be sandwiched between two steel faceplates, which is known as a steel-concrete-steel (SCS) sandwich.SCS sandwich slabs are made of a concrete core between two steel faceplates connected using adhesive materials or mechanical shear connectors [2,3]
The slipping between core and steel layers, the buckling of above steel layers, the cracking of concrete core, and separation of concrete core and steel layers, the buckling of above steel layers, the cracking of concrete core, and the steel layer from the concrete core because of the removal of corrugated-strip connectors (CSC) shear connectors, especially from separation of the steel layer from the concrete core because of the removal of CSC shear connectors, the place of plug welds, were the most crucial failure modes of the SCS system
12, the load-displacement curve of the Figure 12, the typical behaviour of the SCS with NWC core in terms of both stiffness and resistance different shown. with plain lightweight concrete (LWC) core and LWC core reinforced by steel fibres
Summary
In order to increase the ratio of strength to weight of the structures and increase energy absorption, in recent years, the combination of concrete with steel faceplates has been considered by researchers. Sohel and Liew [24] studied eight SCS slabs which consist of a lightweight concrete core sandwiched in between two steel plates interconnected by J-hook connectors under concentrate static load. Steel fibres were added into the concrete core of selected test specimens to evaluate their effectiveness in reducing the brittleness of concrete due to dynamic loads In another investigation in 2017, Leng and Song [26] assessed the flexural and shear performance of SCS sandwich slabs under concentrate loads. Golmohammadi et al [29] conducted test program to investigate the behaviour of SCS which consist of a normal weight concrete core sandwiched in between two steel plates interconnected by stud bolt shear connectors under concentrate static loading. Of the shear are approximately equivalent those of the selected reference specimens
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