TY - JOUR
T1 - An experimental and numerical study of brace-type long double C-section steel slit dampers
AU - Zhou, Xuhong
AU - Tan, Yongchao
AU - Ke, Ke
AU - Yam, Michael C.H.
AU - Zhang, Huanyang
AU - Xu, Jinyong
N1 - Funding Information:
This research is financially supported by the National Natural Science Foundation of China (Grant No. 51890902 and 52178111 ) and Chinese National Engineering Research Centre for Steel Construction, The Hong Kong Polytechnic University (Project No. BBVW). The authors would also like to thank the 111 project (Grant No. B13041) for providing funding support.
Publisher Copyright:
© 2022 Elsevier Ltd
PY - 2023/4/1
Y1 - 2023/4/1
N2 - In this research study, a novel double C-section steel slit damper (DCSSD) was proposed. Six cyclic loading tests of DCSSD specimens were carried out to study the effects of strip aspect ratio, thickness of flange, damper length and steel grades on the hysteretic behaviour and resistance of the DCSSD. Test results showed that the proposed DCSSD exhibited good structural performance in terms of initial stiffness, resistance, ductility and energy dissipation capability. The equivalent damping ratio of all DCSSD specimens exceeded 0.45 while that of the DCSSD using Q160 was over 0.50. Moreover, the cumulative displacement of the DCSSD using Q160 could approach 1500 mm. Subsequently, numerical models of test specimens were built to further investigate load transfer mechanism of the DCSSD. Good agreement was observed between the numerical simulations and the test results. The distribution of the moment and shear over the strips were extracted from the FE database, and the effectiveness of the long DCSSD was confirmed by the even moment and shear distribution profile. Finally, the accuracy of the available design equations of slit steel damper (SSD) documented in the literatures for predicting the initial stiffness and resistance of DCSSD was evaluated. In general, the design models produced inconsistent predictions of the initial stiffness of the test specimens. The existing design equations for predicting the ultimate strength of the DCSSDs were relatively conservative.
AB - In this research study, a novel double C-section steel slit damper (DCSSD) was proposed. Six cyclic loading tests of DCSSD specimens were carried out to study the effects of strip aspect ratio, thickness of flange, damper length and steel grades on the hysteretic behaviour and resistance of the DCSSD. Test results showed that the proposed DCSSD exhibited good structural performance in terms of initial stiffness, resistance, ductility and energy dissipation capability. The equivalent damping ratio of all DCSSD specimens exceeded 0.45 while that of the DCSSD using Q160 was over 0.50. Moreover, the cumulative displacement of the DCSSD using Q160 could approach 1500 mm. Subsequently, numerical models of test specimens were built to further investigate load transfer mechanism of the DCSSD. Good agreement was observed between the numerical simulations and the test results. The distribution of the moment and shear over the strips were extracted from the FE database, and the effectiveness of the long DCSSD was confirmed by the even moment and shear distribution profile. Finally, the accuracy of the available design equations of slit steel damper (SSD) documented in the literatures for predicting the initial stiffness and resistance of DCSSD was evaluated. In general, the design models produced inconsistent predictions of the initial stiffness of the test specimens. The existing design equations for predicting the ultimate strength of the DCSSDs were relatively conservative.
KW - Experiment
KW - Finite element analysis
KW - Hysteretic behaviour
KW - Slit dampers
UR - http://www.scopus.com/inward/record.url?scp=85142733089&partnerID=8YFLogxK
U2 - 10.1016/j.jobe.2022.105555
DO - 10.1016/j.jobe.2022.105555
M3 - Journal article
AN - SCOPUS:85142733089
SN - 2352-7102
VL - 64
JO - Journal of Building Engineering
JF - Journal of Building Engineering
M1 - 105555
ER -