Abstract
The findings of an experimental study that was undertaken to investigate the performance of concrete‐filled steel tubular members subjected to lateral loads are reported in this study. Columns of pure concrete, concrete with reinforcing bars, and two steel tube thicknesses were considered. Two different tests were conducted in this study. One test is used to research the performance of steel tube‐reinforced concrete model piles under a lateral loading. The other test is used to research the effect of the depth of rock embedment for piles embedded in a foundation to simulate actual engineering applications in an experimental study. According to these test results, a detailed analysis was carried out on the relationships, such as the stress‐strain and load‐displacement relationships for the specimen. These tests show that the steel tube thickness and steel bars will significantly enhance the lateral bearing capacity and rigidity of the composite components. Additionally, the ultimate bending moment formula of a steel tube‐reinforced concrete pile is deduced. The comparison of the calculated results with the experimental results shows that this formula is applicable for this type of pile foundation.
Highlights
Concrete-filled steel tube (CFST) members are well recognized for their excellent performance owing to the combination of the merits of steel and concrete materials.erefore, CFSTs are increasingly used in many structural applications, including columns supporting platforms of offshore structures, roofs of storage tanks, bridge piers, piles, and columns in seismic zones [1].In 1957, since Kloppel and Goder et al [2] reported their study of concrete-filled steel tubes, scholars from various countries have conducted extensive and in-depth experimental studies of these structures
A fiber model able to predict the ultimate response of concrete-filled tubular (CFT) members was presented and compared with the experimental results, and the comparison between experimental and numerical results shows a good agreement pointing out the accuracy of the proposed fiber model
Conclusions e behavior of CFSTs has been studied under lateral loads
Summary
Concrete-filled steel tube (CFST) members are well recognized for their excellent performance owing to the combination of the merits of steel and concrete materials. In 1967, Furlong [3] reported the results of axial and compressive bearing tests of 52 CFSTs. In 1993, Grauers [4] carried out an experimental study on high-strength concrete-filled steel tubes; in the experiments, the core of the concrete strength was found to be up to 103 MPa. In 2001, Elchalakani et al [5] presented an experimental investigation of the flexural behavior of circular CFT subjected to large deformation pure bending where d/t 12 to 110 and compared the behavior of empty and void-filled, cold-formed circular hollow sections under pure plastic bending. In order to compare the influence of the thickness of a steel tube on the bearing capacity of composite members, a detailed experimental study on circular CFSTs has been undertaken under lateral loads. The influence of actual engineering applications on the depth of concrete-filled steel tubes was studied and analyzed
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