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Steel and Composite Structures
  Volume 34, Number 1, January10 2020, pages 107-122

Development and testing of cored moment resisting stub column dampers
Po-Chien Hsiao, Kun-Sian Lin, Wei-Chieh Liao, Limeng Zhu and Chunwei Zhang

     Moment resisting stub columns (MRSCs) have increasingly adopted in special moment-resisting frame (SMF) systems in steel building structures, especially in Asian countries. The MRSCs typically provide a lower deformation capacity compared to shear-panel stub columns, a limited post-yield stiffness, and severe strength degradation as adopting slender webs. A new MRSC design with cored configuration, consisting of a core-segment and two side-segments using different steel grades, has been proposed in the study to improve the demerits mentioned above. Several full-scale components of the cored MRSC were experimentally investigated focusing on the hysteretic performance of plastic hinges at the ends. The effects of the depths of the core-segment and the adopted reduced column section details on the hysteretic behavior of the components were examined. The measured hysteretic responses verified that the cored MRSC enabled to provide early yielding, great ductility and energy dissipation, enhanced post-yield stiffness and limited strength degradation due to local buckling of flanges. A parametric study upon the dimensions of the cored MRSC was then conducted using numerical discrete model validated by the measured responses. Finally, a set of model equations were established based on the results of the parametric analysis to accurately estimate strength backbone curves of the cored MRSCs under increasing-amplitude cyclic loadings.
Key Words
    stub columns; moment resisting frames; post-yield stiffness; reduced column sections
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 and Wei-Chieh Liao: Department of Civil Engineering, National Chung Hsing University, 145 Xingda Rd., South Dist., Taichung City 402, Taiwan
Limeng Zhu and Chunwei Zhang: School of Civil Engineering, Qingdao University of Technology, 11 Fushun Rd., Shibei Dist., Qingdao, 266033, P.R. China

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