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Steel and Composite Structures Volume 39, Number 4, May25 2021 , pages 353-366 DOI: https://doi.org/10.12989/scs.2021.39.4.353 |
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Experimental investigation on the seismic performance of cored moment resisting stub columns |
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Po-Chien Hsiao and Kun-Sian Lin
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| Abstract | ||
| Cored moment resisting stub column (CMSC) was previously developed by the features of adopting a core segment which remains mostly elastic and reduced column section (RCS) details around the ends to from a stable hysteretic behavior with large post-yield stiffness and considerable ductility. Several full-scale CMSC components with various length proportions of the RCSs with respect to overall lengths have been experimentally investigated through both far-field and near-fault cyclic loadings followed by fatigue tests. Test results verified that the proposed CMSC provided very ductile hysteretic responses with no strength degradation even beyond the occurrence of the local buckling at the side-segments. The effect of RCS lengths on the seismic performance of the CMSC was verified to relate with the levels of the deformation concentration at the member ends, the local buckling behavior and overall ductility. Estimation equations were established to notionally calculate the first-yield and ultimate strengths of the CMSC and validated by the measured responses. A numerical model of the CMSC was developed to accurately capture the hysteretic performance of the specimens, and was adopted to clarify the effect of the surrounding frame and to perform a parametric study to develop the estimation of the elastic stiffness. | ||
| Key Words | ||
| buildings; energy dissipation; high-strength steel; moment/moment resistance; near-fault ground motion; steel/steel structure | ||
| Address | ||
| Po-Chien Hsiao: Department of Civil and Construction Engineering, National Taiwan University of Science and Technology, 43 Keelung Rd., Sec.4, Taipei City 106, Taiwan Kun-Sian Lin: Department of Civil Engineering, National Chung Hsing University, 145 Xingda Rd., South Dist., Taichung City 402, Taiwan | ||