| Abstrakt: |
Purpose: Rubber-based isolation systems produce enormous isolator displacement, requiring large seismic gap and causing excessive residual displacement, which can damage the isolator and it has lack of energy dissipation capability. These can be overcome by incorporating shape memory alloy (SMA) with rubber bearing (SMARB). However, studies were conducted ignoring the effect of soil structure interaction (SSI), which significantly alters seismic responses of isolated buildings due to soil flexibility effect. Methods: This study aims to assess the optimal seismic performance of a multistoreyed building isolated with SMARB device subjected to recorded earthquakes using particle swarm optimization algorithm to minimize top storey acceleration of building considering the effect of different types of soil, which is modelled using direct method and the soil is considered linear, elastic, massless and homogeneous. The numerical modelling of SMA is done using Graesser-Cozzarelli model and the responses are evaluated by solving dynamic equation of motion of the combined system, which comprises the superstructure, isolator and soil. Results: The effect of SSI reduces top storey acceleration and isolator displacement of the isolated building. The top storey acceleration is reduced by 3.1%, 27.8% and 35.8% and isolator displacement is reduced by 15.2%, 24.9% and 32.0% for hard, medium and soft soil, respectively. Negligible residual displacement is obtained for SMARB system considering SSI effects. Conclusion: Among the various isolation devices (rubber bearing, lead rubber bearing and SMARB), SMARB performs significantly better and ignoring the effects of soil typology leads to a severe underestimation of the performance of the isolated building. [ABSTRACT FROM AUTHOR] |
Full text from SpringerLink