Experimental investigation of FPS inter-storey isolation control for assembled steel structure with high aspect ratio

Abstract

A comprehensive experimental investigation of high-rise structure employing the friction pendulum system (FPS) in accordance with inter-storey isolation control strategy are presented in this paper. A test assembled steel structure is constructed in accordance with the third generation Benchmark model. Three types of FPS systems with varied slideway radius are designed and manufactured. Through shaking table tests, seismic performance of the FPS inter-storey isolation (FPS-I) strategy for structure with a high aspect ratio was examined. The test cases involve eight isolation layer locations, six ground motions, and four types of peak ground accelerations (PGA). The test results demonstrate that using FPS-I scheme to control vibration of assembled steel structure with an aspect ratio greater than four is feasible and effective. Furthermore, when the FPS is installed on the 6th to 8th floors of the structure, the top floor’s acceleration attenuation rate is approaching 67%, leaving the controlled structure’s response is only one third of the uncontrolled structure. The dynamic characteristics of the controlled structure are impacted by the isolation layer's location, which is indicated in the changing of the ratio of the modal participation mass coefficients. By regulating the contribution factor of each mode, the FPS-I scheme effectively lessens the structural high-order mode’s contribution to structural response.