Development of Advanced Experimental Technology on Reproducing Floor Response of High-rise Buildings subjected to Ground Motions
Pei-Ching Chen1, Chin-Ta Lai2, Keh-Chyuan Tsai3
1 National Taiwan University of Science and Technology, Taiwan
No.43, Keelung Rd., Sec.4, Da’an Dist., Taipei 10607, Taiwan
2 National Center for Research on Earthquake Engineering, Taiwan
No. 200, Sec. 3, HsinHai Rd., Da’an Dist., Taipei 10667, Taiwan
ctlai@ncree.narl.org.tw
3 National Taiwan University, Taiwan
No. 1, Sec. 4, Roosevelt Rd., Da’an Dist., Taipei 10617, Taiwan
kctsai@ntu.edu.tw
Abstract. The responses of high-rise buildings are mostly dominated by the first few vibration modes; therefore, the corresponding floor responses at high levels have long predominant periods. Damages of nonstructural components located in high-rise buildings generally cause functional loss due to the long-period acceleration after earthquakes. Typically, shaking table testing is regarded as one of the effective experimental tools to investigate the dynamic responses of structures and nonstructural components for earthquake engineering researches. However, it may be difficult to reproduce high-floor responses by using typical seismic shaking tables due to the actuator stroke limitation. In this study, a proof-of-concept passive transfer system incorporating various modern control schemes is proposed in order to reproduce high-floor responses without changing the hardware and software layout of an existing shaking table. A set of friction pendulums is adopted as the transfer system since its vibration frequency barely depends on the curvature. Three control algorithms are designed and validated through an outer-loop control approach, including proportional-integral-derivative control, inverse feedforward control, and linear-quadratic-integral control with Kalman filter. Accelerometers and displacement transducers are installed on the top of the transfer system to measure the signals for the control computation. The roof responses of a 34-story building in Kaohsiung city subjected to various historical earthquakes are used as reference accelerations in the validating tests. Experimental results demonstrate these aforementioned methods reproduce the high-floor responses successfully.
Keywords: Long-period response reproduction, High-rise buildings, Transfer system, Outer-loop control.
