LAUSR

The interstorey isolation technology, as a conventional method for vibration control, is widely used to mitigate the seismic response of high-rise building structures. Traditional passive interstorey isolation systems, based on the principles of tuned mass dampers, offer effective control under optimal tuning conditions. However, they exhibit significant sensitivity to frequency deviations, and the use of inappropriate or fixed damping can significantly reduce the robustness of the vibration-damping performance. In this work, a novel passive interstorey isolation system is proposed, incorporating a carbon fiber powder-based shear thickening fluid (CFP-STF) to improve the system’s frequency robustness through nonlinear, frequency-dependent damping. This marks the first application of STF’s self-adaptive rheological behavior in interstorey isolation, without relying on external power or complex active control schemes. The nonlinear damping characteristics of the CFP-STF-based isolator are discussed. A 9-degree-of-freedom vibration control benchmark model with uncontrolled, constant damping, and CFP-STF adaptive damping is established. The performance indices, including absolute displacement and isolation storey stroke, are examined to compare the vibration control effects under excitation by harmonic loads with varying frequency ratios and ground motions with different spectral characteristics. The results demonstrate that the CFP-STF-based adaptive inter-storey isolation system is more robust and efficient than the constant-damping control strategy, as CFP-STF allows real-time adaptive tuning of both frequency and damping parameters without additional power consumption. In particular, the CFP-STF system reduces absolute displacement by 83% under harmonic excitation (frequency ratio = 1.5) and achieves an 87% lower stroke than the constant-damping strategy in seismic tests. These findings highlight the potential benefits of integrating adaptive STF materials into passive isolation systems for improving the seismic performance of high-rise structures.