Abstract
Different to conventional reinforced concrete or steel material, a new type of concrete-filled steel box slab has been proposed by effectively integrating the combined benefits of both steel and concrete. By filling concrete, this type of slab could avoid the local bucking of steel plate and then could provide a high moment capacity. Therefore, this study aims to investigate the flexural behavior of concrete-filled steel box slabs through testing seven specimens and characterize their failure characteristics, stress distribution and ultimate moment capacity. A comprehensive parametric study focuses on the influence of the steel plate thickness, the stud and stiffening plate on the slab flexural behavior. The results show that concrete-filled steel box slabs had a high moment capacity and good ductility. The thickness of the steel plate had a significant influence on the moment capacity of the specimen. The stud led to the reduction of the moment capacity of the slab. The stiffening plate effectively improved the flexural behavior of the specimen. Moreover, a calculation method was formulated to describe the moment capacity of the slab and compared with experimental results. The results show that the proposed method for the moment capacity of the slab was conservative and reasonable.
Highlights
The first group was the concrete-filled steel box slab without stud and stiffening plate, numbered S-1, where S referred to the slab
The end of the stud was welded on the steel plate
This indicated that thesteel stiffening provided extra that the S-5, stiffening plate extra constraints for the boxes,plate which delayed the constraints for the steel boxes, which delayed the occurrence of the local buckling of the top occurrence of the local buckling of the top steel plates and effectively improved the mosteel plates and effectively improved the moment capacities of the specimens
Summary
Seven specimens of concrete-filled steel box slabs were designed and divided into four groups. The first group was the concrete-filled steel box slab without stud and stiffening plate, numbered S-1, where S referred to the slab. The second group included 4 concrete-filled steel box slabs with studs which numbered S-2, S-3, S-6 and S-7. The variation parameters of the second group were the steel plate thicknesses and the distances between studs. The third group was the concrete-filled steel box slab with stiffening plate, numbered S-4. The fourth group was the concrete-filled steel box slab with studs and stiffening plates, numbered. The fourth group was the concrete-filled steel box slab with studs numbered S-4. The fourth group was the concrete-filled steel box slab with studsand andstiffstiffening eningplates, plates,numbered numberedS-5. The end of the stud was welded on the steel plate
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