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Steel and Composite Structures Volume 51, Number 6, June 25 2024 , pages 587-600 DOI: https://doi.org/10.12989/scs.2024.51.6.587 |
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Research on seismic performance of regionally confined concrete circular column with trapezoid stirrups |
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Longfei Meng, Hao Su, Yanhua Ye and Haojiang Li
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| Abstract | ||
| In order to investigate the seismic performance of regionally confined concrete circular column with trapezoid stirrups (TRCCC) under high axial compression ratio, the confinement mechanism of regionally confined concrete was analyzed. Three regionally confined concrete circular columns with trapezoid stirrups were designed, and low cyclic loading tests were conducted at three different axial compression ratios (0.9, 1.1, 1.25) to study the failure mode, hysteresis curve, skeleton curve, deformation capacity, stiffness degradation and energy dissipation capacity of the specimens. The results indicate that the form of regional confinement concrete provides more uniform confinement to the normal confinement, and the confinement efficiency at the edges is 1.4 times that of normal confined concrete. The ductility coefficients of the specimens were all greater than 3 under high axial compression ratios, and the stiffness and horizontal bearing capacity increased with the increase of axial compression ratio. Therefore, it is recommended that the code of design specifications can appropriately relax the axial compression ratio limit for TRCCC. Finally, the spacing between stirrups of TRCCC was analyzed using ABAQUS software. The results showed that as the spacing between the stirrups decreased, the cracking load and peak load of TRCCC increased continuously, but the rate of increase decreases. | ||
| Key Words | ||
| regionally confined concrete column; trapezoid stirrup; seismic performance; low cyclic loading tests; finite element analyses; axial compression ratio | ||
| Address | ||
| Longfei Meng and Hao Su:School of Civil Engineering, Xi'an University of Architecture and Technology, No.13, Yanta Road, Beilin District, Xi'an, China Yanhua Ye and Haojiang Li:School of Civil Engineering, Nanjing Tech University, No.30 Puzhu South Road, Pukou District, Nanjing, China | ||