Abstract
ABSTRACT This paper presents a series of test results of large-scale rectangular concrete-filled steel tubular (CFST) beams to explore their performance under pure bending. Concrete-filling tests were initially carried out on two beam specimens of 12-m in length to investigate the feasibility of casting horizontally large-scale rectangular tubes. A total of six 6-m long specimens were subjected to flexural test afterward, including four CFST beams and two steel hollow section (SHS) beams for comparison. The test results showed that the rectangular CFST beams behaved in a relatively ductile manner. The concrete infilling enhanced the flexural behavior and performance of the steel tubes. Finally, the rigid-plastic theory showed suitable to predict the moment capacity of CFST compact beams.
Highlights
The association of steel and concrete to build structural composite beams for buildings has evolved along the years
This paper presents a series of test results of large-scale rectangular concrete-filled steel tubular (CFST) beams to explore their performance under pure bending
The infill of concrete enhanced the performance of the beam specimens probably due to the establishment of the composite action between the steel tube and the concrete core
Summary
The association of steel and concrete to build structural composite beams for buildings has evolved along the years. After concretes with higher mechanical properties became more readily available, design engineers realized the advantages of considering its contribution to the flexural capacity of the beams, establishing the steel-concrete composite beams (Figure 1a). Concrete-filled steel tubular (CFST) columns show enhanced structural performance over either a steel column or a reinforced concrete column due to the confinement of the concrete provided by the steel tube and to the lateral support of the steel tube provided by the concrete core, i.e., local buckling of the steel tube is delayed due to the restraining effect of the concrete Additional advantages of this type of CFST column system include (i) construction efficiency due to the elimination of formwork, besides the reduction in manpower, construction cost and construction time, (ii) fire resistance improved by the infilled concrete, and (iii) reduced environmental impact by omitting the formwork. The studies demonstrated the increase in ductility and showed the enhancement in flexural capacity of the composite
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