Abstract
The sequential ground motion effects on the dynamic responses of reinforced concrete containment (RCC) buildings with typical isolators are studied in this paper. Although the base isolation technique is developed to guarantee the security and integrity of RCC buildings under single earthquakes, seismic behavior of base-isolated RCC buildings under sequential ground motions is deficient. Hence, an ensemble of as-recorded sequential ground motions is employed to study the effect of including aftershocks on the seismic evaluation of base-isolated RCC buildings. The results indicate that base isolation can significantly attenuate the earthquake shaking of the RCC building under not only single earthquakes but also seismic sequences. It is also found that the adverse aftershock effect on the RCC can be reduced due to the base isolation applied to the RCC. More importantly, the study indicates that disregarding aftershocks can induce significant underestimation of the isolator displacement for base-isolated RCC buildings.
Highlights
Historical earthquakes show that mainshock-aftershock sequence-type ground motions are formed when frequent aftershocks occur after a strong mainshock [1]
It shows that for the fixed-base reinforced concrete containment (RCC) the effective mass participations in X and Y direction are in the order of 77.1% for the first mode and second mode and 20.1% for the 19th mode and 20th mode while they are in the order 100% for the first and second modes for the base-isolated RCC
It means that the dynamic behavior for both types of RCC is mainly controlled by the fundamental mode
Summary
Historical earthquakes show that mainshock-aftershock sequence-type ground motions are formed when frequent aftershocks occur after a strong mainshock [1]. As the last defense against nuclear leakage, the reinforced concrete containment (RCC) building subject to sequential ground motions is researched by [26]. It reveals that sequential ground motions can have adverse effects on the dynamic responses of the RCC including acceleration, displacements, and accumulated damage. This paper is to study the effect of sequential ground motions on the seismic behavior of the RCC building with lead rubber bearing (LRB) isolators. To achieve this aim, finite element models for fixed-base and base-isolated RCC buildings are established employing the software ABAQUS 6.10 [39]. The damaging aftershock sequence is investigated and given in this manuscript
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