抄録
Shaking table testing has been regarded as one of the most direct experimental methods to evaluate the seismic response of structural systems subjected to earthquake ground motions. However, some structures such as long-span bridges and piping systems, by nature, are subjected to spatially varying earthquake ground motion, which cannot be reproduced by using traditional shaking tables. Therefore, a multiple shaking table test system is essential to meet the requirements of these specific research purposes by allocating different configurations of each individual table. In this paper, a multiple shaking table test system which has been constructing at National Center for Research on Earthquake Engineering is first introduced. In order to improve the acceleration tracking, an outer-loop controller needs to be employed in the servo-hydraulic system control loop. A control framework is proposed by using advanced hardware and software, allowing rapid outer-loop controller implementation and validation. Finally, a preliminary study for improving the acceleration performance of one of the shaking tables is carried out. Experimental results indicate that feedforward displacement compensation can effectively increase the frequency bandwidth of the table acceleration. Furthermore, the results also demonstrate the efficacy and feasibility of the proposed control framework for the multiple shaking table test system.
