Seismic performance assessment of a G+4 school building in Gujarat, Ahmadabad
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ORIGINAL PAPER
Seismic performance assessment of a G+4 school building in Gujarat, Ahmadabad Surender Dhoopati1 · Rajaram Chenna1 Received: 25 May 2020 / Accepted: 10 September 2020 © Springer Nature Switzerland AG 2020
Abstract Recent earthquakes have demonstrated that masonry infill walls cause major damage to the structure. Schools and hospital buildings are not built to achieve adequate lateral strength and stiffness as per seismic codes. The 2001 Bhuj earthquake is one of the examples where 1900 school buildings collapsed and 971 children died due to improper design. The present paper discusses the seismic damage of a G+4 school building through fragility curves. For the purpose of analysis, a severely damaged school building during the 2001 Bhuj earthquake was taken. The building is modeled in Applied Element Method. A non-linear static pushover analysis is performed in displacement control to understand the capacity of building. Finally, the seismic damage is estimated through fragility curves. The building has experienced 15% probability of moderate damage, and less than 1% probability of collapse at peak ground acceleration of 0.11 g. Keywords School building · Pushover analysis · Fragility curve · Seismic damage
Introduction Earthquakes are one among the most dangerous and destructive natural catastrophes. Several recent earthquakes have been responsible for the fatalities of human being and even collapse of numerous buildings. Especially, Reinforced Concrete (RC) buildings performed poor response due to low seismic forces acting on buildings (Barbosa et al. 2017). The masonry infill wall increases additional lateral strength and stiffness to the building. On the other hand, different failure modes can occur for irregular buildings. Nowadays, most of the masonry structures are constructing with large openings. The structure may undergo shear failure due to lateral forces acting on it (Furtado et al. 2016, 2017). In general, the probabilistic failure of a structure can be represented through fragility curves. It is a plot between spectral acceleration or spectral displacement and probability of exceedance of damage. Several studies have been done on Reinforced Concrete (RC) and Steel framed buildings to understand the seismic damage. * Rajaram Chenna [email protected] 1
Department of Civil Engineering, Rajeev Gandhi Memorial College of Engineering and Technology, Nandyal, Andhra Pradesh, India
The seismic performance for code compliant and noncompliant RC Special Moment Resisting Frames (SMRF) is same in slight and moderate damage states (Ahmad et al. 2018, 2019b). The seismic damage varies with lowto medium-rise buildings. A displacement-based fragility curves are derived for low- to medium-storey buildings in Turkey and concluded that the fragility curves change significantly with number of stories of building (Akkar et al. 2005; Kirçil and Polat 2006). The seismic fragility curves have been significantly changed at different damage levels due to uncertainties in material and geometry proper
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