Comparison of Shear Behaviors of Different Concrete-Filled High-Strength Steel Tubes

WANG Jiali; WANG Ying; CHEN Xiwen; YANG Dongxu; LAI Zhichao

doi:10.3969/j.issn.0258-2724.20230485

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Journal of Southwest Jiaotong University > 2025 >

WANG Jiali, WANG Ying, CHEN Xiwen, YANG Dongxu, LAI Zhichao. Comparison of Shear Behaviors of Different Concrete-Filled High-Strength Steel Tubes[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230485

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WANG Jiali, WANG Ying, CHEN Xiwen, YANG Dongxu, LAI Zhichao. Comparison of Shear Behaviors of Different Concrete-Filled High-Strength Steel Tubes[J]. Journal of Southwest Jiaotong University. doi: 10.3969/j.issn.0258-2724.20230485

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Comparison of Shear Behaviors of Different Concrete-Filled High-Strength Steel Tubes

doi: 10.3969/j.issn.0258-2724.20230485

College of Civil Engineering, Fuzhou University, Fuzhou 350000, China

Received Date: 19 Sep 2023
Rev Recd Date: 20 Dec 2023

Available Online: 09 Jan 2025

Abstract

Abstract

A total of 16 concrete-filled high-strength steel tube specimens were designed to evaluate the effects of shear-to-span ratio and concrete strength on the shear behavior of concrete-filled high-strength steel tube specimens. The failure mode and shear-displacement curve of the specimens were obtained through the test, and the effects of shear-to-span ratio, core concrete strength, and other parameters on the failure mode, shear-displacement curve, shear-shear strain curve, shear strength, and shear stiffness were compared. The results show that similar to conventional concrete-filled steel tube specimens, the shear-to-span ratio is the key parameter controlling the failure mode of the concrete-filled high-strength steel tube specimens. When the shear-to-span ratio is 0.2 or 0.5, shear failure occurs; when the shear-to-span ratio is 0.8 or 1.0, shear-flexural failure occurs. By implementing ultra-high performance concrete (UHPC), the deformation capacity of the concrete-filled high-strength steel tube specimens (with a shear-to-span ratio of 1.0) is reduced by 61.4%. However, shear strength and stiffness increase by 38.9% and 85.7%, respectively. Additionally, local buckling of the steel tubes is effectively delayed, and the damage degree of the specimens is reduced. The inclination angle of the main diagonal cracks in the core concrete decreases with an increase in the shear-to-span ratio but is not affected by the concrete strength. The average value of tested shear strength/calculated shear strength (V_exp/V_u) is 0.97, with a deviation of 0.03, showing higher accuracy and smaller dispersion. It is considered that the formula can accurately predict the shear strength of concrete-filled high-strength steel tubes.
- concrete-filled steel tube,
- high-strength steel tube,
- shear behavior,
- failure mode,
- design method

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