Study of a semi-active stiffness damper under various earthquake inputs

Publisher:
John Wiley & Sons Ltd.
Publication Type:
Journal Article
Citation:
Earthquake Engineering and Structural Dynamic, 2002, 31 (10), pp. 1757 - 1776
Issue Date:
2002-01
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Semi-active sti-ness damper (SASD) is one of many semi-active control systems with the capability to mitigate the dynamic response using only a small amount of external power. The system consists of a hydraulic damper connected to the bracing frame in a selected story unit. In this paper, study of a SASD in two building models of ?ve-stories under four benchmark earthquake records is reported. The purpose of this study is to evaluate the e-ectiveness of the control system against structure type and varying earthquake inputs. Various control laws are chosen to work with SASD, such as: resetting control, switching control, linear quadratic regulator (LQR) and modi?ed LQR, and the results are compared with no control and passive control cases. Numerical results show that the use of a SASD is effective in reducing seismic responses. Control efftiveness is dependent on the type of structure and earthquake excitation. Passive control is less e-ective than other control cases as expected. Resetting control, switching control and LQR generally perform similarly in response reduction. While modified LQR is more efficient and robust compared with other control algorithms.
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