Research on bias stress characteristics and influencing factors of concrete stacked columns with thin-walled steel tubes restrained by spiral ribs
This study introduces an innovative spiral stiffener to mitigate the local buckling issue of thin-walled steel tubular concrete. In response to diverse restraint forms, 5 distinct specimen types were designed to probe the eccentric compression test. behavior & failure modes of the composite memb...
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| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Taylor & Francis Group
2025-02-01
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| Series: | Journal of Asian Architecture and Building Engineering |
| Subjects: | |
| Online Access: | http://dx.doi.org/10.1080/13467581.2025.2457384 |
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| Summary: | This study introduces an innovative spiral stiffener to mitigate the local buckling issue of thin-walled steel tubular concrete. In response to diverse restraint forms, 5 distinct specimen types were designed to probe the eccentric compression test. behavior & failure modes of the composite member. Test results: Spiral ribs limit steel tube buckling between stiffeners, reduce degree. Vs. ord. concrete-filled steel tube, bearing cap. up from 932kN to 1119kN (20% growth), safety margin from 1.48 to 1.84 (24% incr.). An empirical analysis of impact parameters was conducted, revealing that the pitch（$p$） and width-thickness ratio of the spiral rib（${b_{\rm{r}}}/{t_{\rm{r}}}$） had a more pronounced effect on the damage morphology of the specimen. Design recommendations were provided: the diameter-thickness ratio of the steel pipe（${d_{\rm{s}}}/{t_{\rm{s}}}$）was limited to 110–150, the reinforcement rate($\rho $) was between 0.8% and 2%, the pitch was 3.33 times the diameter of the specimen, and the width-thickness ratio of the spiral ribs was between 6 and 10. Through eccentricity(${e_0}/{r_c}$) analysis, the damage limitations of this new component were determined to be approximately 0.5 eccentricity for both large and small eccentricities. Finally, based on superposition theory, a formula for ecc. compressive bearing cap. of new member type is proposed. |
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| ISSN: | 1347-2852 |