Abstract
Base isolation incorporation has moved towards a popular technology in the seismic vulnerable regions. The system mitigates lateral action of tremor hazard providing flexibility of structures. Implementing base isolation on buildings in the soil and seismic condition of medium risk seismicity is currently an important issue. A thorough investigation is of burning need for buildings to be incorporated with base isolator and to carry out dynamic analysis. The study provides incorporation of rubber-steel bearings and focuses on the structural changes. Designs of base isolation bearings are performed along with structural viability check. Lead rubber bearing (LRB) and high damping rubber bearing (HDRB) have been inserted on the corresponding structural bases. In finite-element approach, link element simulates the bearing. Bi-linear hysteretic behaviour is presented for LRB and equivalent linear model simulated HDRB. Linear static, free vibration and dynamic frequency-domain analyses are performed for both isolated and non-isolated buildings under bidirectional site-specific earthquake. The study reveals that for multi-storey buildings, isolation can drastically reduce seismic responses. Furthermore, flexibility of buildings predicts some structural savings for reduced responses. Good agreement has been achieved through rapid solution in frequency-domain approach. In medium risk earthquake-prone area, rubber-steel bearing isolators can be beneficially inserted.
Highlights
Increasing global demand of multi-storey structures is looking forward to the efficient design solution to tackle the vulnerable seismic hazard
The structural system follows subsequent assumptions: 1) The superstructure and the base of the building have been configured using 6 degrees of freedom at the centre of mass of apiece floor; 2) The superstructure behaves elastic and inelastic during earthquake excitation; 3) Floors are considered as rigid in own plane and mass is lumped at every respective floor; 4) Total structural configuration is excited by bidirectional components of earthquake ground motion (x- and y-directions); 5) Base isolators convey the vertical load undergoing no vertical deformation; 6) Bi-linear model simulates Lead rubber bearing (LRB), and equivalent linear model is selected for high damping rubber bearing (HDRB); 7) The rubber-steel bearings are fixed at bottom to the foundation and at top with the base mass
Forcedeformation behaviours of the isolators in this study are modelled as numbered (1) for LRB and (2) for HDRB: 1) Nonlinear hysteretic loop directly specified by the bi-linear model; and
Summary
Increasing global demand of multi-storey structures is looking forward to the efficient design solution to tackle the vulnerable seismic hazard. Jangid (2007) and Providakis (2008) explored the responses of aseismic multi-storey buildings isolated by LRB at near fault motion. Incorporation of this innovative seismic isolation system was well evaluated and reviewed for multi-storey buildings (Agarwal et al 2007; Komodromos 2008; Lu, Lin 2008; Seçer, Bozdağ 2011; Spyrakos et al 2009). Islam et al (2013b) studied the optimisation in structural altitude for isolation system and efficient design (Islam et al 2013c) in multi-storey buildings using HDRB and LRB in building base. Flexibility of structure has been experienced through seismic base isolation
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