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Earthquakes and Structures Volume 28, Number 2, February 2025 , pages 107-121 DOI: https://doi.org/10.12989/eas.2025.28.2.107 |
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Cyclic performance of Y-braced steel frames equipped with a block slit damper |
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Chen Zhou, Hua Yang, Bing Tian, Hong Zheng, Liqiang Jiang, Yang Wu, Xiaodong Xu, Lizhong Jiang and Zhen Zhao
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| Abstract | ||
| This paper investigates the cyclic performance of Y-braced steel frames (YSFs) equipped with a block slit damper (YSF-BSD). On the basis of the validation of an existing test on a Y-braced steel frame, the finite element (FE) model of YSF-BSD was developed. Then, parametric analyses are conducted to analyse the effects of the material strength, height-to-width ratio, height-to-thickness ratio, number and section shrinkage ratio of steel strips on the seismic performance and stiffness distributions of YSF-BSDs. The results show that (1) the ductility of YSF-BSD increases by 59.57% compared with that of conventional YSF, but the lateral loading capacity decreases by approximately 3.26%; (2) according to the parametric analysis results, the number of steel strips is suggested to be 4~5, the height-width ratio is 3~3.6, the height-thickness ratio should be larger than 3.3, and the section shrinkage ratio of steel strips should be 0.4~0.5; (3) a theoretical method is developed to determine the lateral stiffness distributions of YSF and BSDs, and the maximum error is less than 19.49%, most of which are less than 10%, and the lateral stiffness ratio of BSD to YSF is suggested to be 10~15 considering the ductility and deformation capacity of YSF-BSD. | ||
| Key Words | ||
| block slit damper (BSD); cyclic performance; parametric analysis; stiffness distribution; Y-braced steel frame | ||
| Address | ||
| Chen Zhou, Liqiang Jiang and Lizhong Jiang: School of Civil Engineering, Central South University, Changsha 410075, China Hua Yang: 1) School of Civil Engineering, Central South University, Changsha 410075, China, 2) School of Civil Engineering, Chang'an University, Xi'an, 710061, China Bing Tian, Yang Wu and Zhen Zhao: 3rd Construction Co. Ltd. of China Construction 5th Engineering Bureau, Changsha 410004, China Hong Zheng: School of Civil Engineering, Chang'an University, Xi'an, 710061, China Xiaodong Xu: Power China Northwest Engineering Co. Ltd, Xi'an, 710075, China | ||