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Experimental and Analytical Research on Flexural Behavior of Concrete-Filled High-Strength Steel Tubular Members
Content Provider | MDPI |
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Author | Zhang, Zai-Yu Sun, Qing Wang, Jia-Qi Zhao, Chao Zhao, Bing-Zhen Wang, Jian-Tao |
Copyright Year | 2022 |
Description | Using high-strength steel (yield strength $f_{y}$ ≥ 460 MPa) in concrete-filled steel tubes is expected to provide a superior bearing capacity by achieving light weight and efficient construction, but the existing design limitation on diameter-to-thickness (D/t) ratios for concrete-filled high-strength steel tubular (CFHST) members inevitably obstructs its wide application. In this study, aiming at the application of circular CFHST members using Q690 steel $(f_{y}$ ≥ 690 MPa), a total of 15 CFHST beams were examined using a three-point loading test to investigate the failure mode, bearing capacity and plasticity evolution. Subsequently, finite element models (FEMs) were established to analyze the full-range curves, composite effect, failure mechanism and influences of key parameters including material strengths, D/t ratios, and shear-span ratios. A simplified calculation method for bearing capacity was finally proposed and verified. The results indicate that the full-range performance of tested CFHST members with out-of-code D/t ratios have ductile behavior, though they fail through the mode of steel fracture and concrete cracks in the tension zone as well as through local buckling in the compression zone; out-of-code CFHST members (e.g., D/t = 120) can perform reasonable composite behavior because of contact pressure larger than 2.5 MPa, where a thin-walled steel tube experiences an arch failure mechanism similar to core concrete at a trussed angle of 45°; the simplified bearing capacity model achieves a mean value of 0.97, and can be accepted as a primary tool to perform structural design and performance evaluation. |
Starting Page | 3790 |
e-ISSN | 19961944 |
DOI | 10.3390/ma15113790 |
Journal | Materials |
Issue Number | 11 |
Volume Number | 15 |
Language | English |
Publisher | MDPI |
Publisher Date | 2022-05-26 |
Access Restriction | Open |
Subject Keyword | Materials Civil Engineering Cfhst Members Out-of-code D/t Ratios Flexural Performance Full-range Analysis Bearing Capacity Model |
Content Type | Text |
Resource Type | Article |