Abstract
The current paper aims to investigate the effect of steel tube thickness on the structural behavior of concrete composite beams with different steel tube sections. The experimental work of this study included a series of bending tests. The loading type used to study this effect on bending behavior of steel tubes was simply supported beam tested by two points load. Six composite beam specimens were performed and tested up to failure using three shapes of steel section (hexagonal, square and rectangular), every two specimens have the same shape of steel section. The type of shear connector was the headed stud for all specimens and to investigate the effect of thickness, this study used two thicknesses of steel tube sections of (2) mm and (3) mm. The tests showed improvement in the flexural behavior by increasing thickness of different steel section shapes, (50%) increasing in steel tube thickness led to increase the ultimate load by (32% - 34%). The ultimate slip at the ultimate load, for each specimen, is decreased by increasing the thickness of steel tube, the range of decreasing is ( 3.55% - 30.16% ).
Highlights
Composite term means two or more than one material interfere to combined distinctive unit mass offers several advantages over non-composite portion [1,2]
During testing of the specimens, flexural cracks are observed at the bottom of the concrete flange of all specimens, these cracks are initiated at different load stages, extended further and corresponded to the increasing of the load applied
This paper described an experimental study that focused on the behavior and strength of steel–concrete composite beams with different steel tube sections
Summary
Composite term means two or more than one material interfere to combined distinctive unit mass offers several advantages over non-composite portion [1,2]. This study includes testing of six specimens of concrete composite beams with steel tube sections instead of I-Section, details of experimental specimens is tabulated in Table (1). The locally material were used in producing selfcompacted concrete as shown in Figure (6), which include gravel, cement, sand, lime stone and water with super plasticizer as an admixture for concrete mixing. Supported composite beam specimens were tested after (28) days in Diyala university/engineering college–structural libratory to get data Collection, under two concentrated loads applied at the third points with (1900) mm clear span as shown in Figure (4).They are prepared, cleaned and painted with a white color in order to reveal of possible cracks. The load is applied and the readings are taken every (5) kN, and at every increment, manual measurements are recorded including the load, central deflection, slip, crack width by data crack device
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