Vol. 18, No. 2, pp. 552-560 (2022)
Seismic Performance Evaluation of Steel Frames with
Dampers AddED on Existing Structures
Jin-Peng Tan 1, Dan-Guang Pan 1, 2, * and Xiang-Qiu Fu 1
1 Department of Civil Engineering, University of Science and Technology Beijing, Beijing 100083, China
2 Beijing Key Laboratory of Urban Underground Space Engineering, School of Civil and Resource Engineering,
University of Science and Technology Beijing, Beijing 100083, China
*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 9 June 2021; Revised: 11 September 2021; Accepted: 14 September 2021
DOI:10.18057/IJASC.2022.18.2.4
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ABSTRACT
The steel frames with dampers added on the top of existing structures would lead to highly non-proportional damped systems whose conventional seismic response analysis is substantially time-consuming. This paper aims to propose a real-mode-based complex mode superposition method (RMCMSM) with high computational efficiency and high accuracy. The method transforms the linear combination of complex modes into real modes with complex coefficients. It significantly reduces the time to solve complex eigenvalues and the number of complex operations, and improve computational efficiency. An ideal 2-DOFs system is used to investigate the effects of additional dampers in adding stories on modal damping ratios, coupling index and the seismic response. A real-world 5-storey structure was further analyzed to demonstrate the accuracy and efficiency of the proposed method. The numerical results show that, when the equivalent damping ratio of the additional damper increases, the stronger the non-proportionality of the system, the significantly lower the seismic response of the top layer. When designing the steel structure for the new storeys, the additional mass should be minimized and the natural frequency ratio of the overall structure should remain on the interval between 0.6 and 1.2 so that the damping effect of the additional dampers can be fully utilized. Consequently, the overall seismic performance can be enhanced.
KEYWORDS
Vertically mixed structure, Seismic response, Additional damper, Non-proportional damping, Complex mode superposition method
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