Seismic Isolation Performance of SMA Reinforced Hybrid Isolation Concrete Liquid Storage Structures

Abstract

The Plate-Shell Integrated Concrete Liquid-Storage Structure (PSICLSS) is an emerging form of water treatment infrastructure. To elucidate its dynamic response mechanism and evaluate the seismic mitigation performance of an SMA-reinforced hybrid isolation system, this study employed finite element analysis (FEA) and shaking table testing to investigate the structural dynamic response characteristics and liquid sloshing behavior under seismic excitation. Shaking table tests were conducted under both unidirectional and bidirectional seismic excitations to further characterize the dynamic responses of the PSICLSS. The results demonstrate that the beams of the PSICLSS are susceptible to tensile failure under seismic loading, whereas the bottom supporting columns and lower slab are vulnerable to shear failure. The structural acceleration response exhibits an increasing amplification effect with increasing plate elevation, and the hydrodynamic pressure of the internal liquid is consistently greater than that of the external liquid. The proposed SMA-reinforced hybrid isolation layer demonstrates effective seismic mitigation performance by reducing the acceleration response of the PSICLSS and lowering the peak hydrodynamic pressure; however, it also results in increased liquid sloshing height. When vertical seismic excitation is considered, the hydrodynamic pressure increases significantly, while the residual displacement of the isolation layer decreases correspondingly.