Abstract
This paper presents a seismic performance evaluation framework for reinforced concrete (RC) buildings, comprising of shear-walls and gravity frames. The evaluation is undertaken within a performance-based earthquake engineering framework by considering regional seismicity and site-specific ground motion selection. Different engineering demand parameters (EDPs), i.e. maximum inter-story drift ratio and energy-based damage index, are considered as performance indicators. Various prediction models of EDPs are developed by considering four ground motion intensity measures (IMs), i.e. spectral acceleration at the fundamental period, Arias intensity, cumulative absolute velocity, and significant duration of ground motion. For this study, a 15-story RC building, located in Vancouver, British Colombia, Canada, is considered as a case study. Using 50 mainshock and 50 mainshock-aftershock earthquake records (two horizontal components per record and bi-directional loading), nonlinear dynamic analyses are performed. Subsequently, the calculated maximum inter-story drift ratios and damage indices are correlated with suitable IMs using cloud analysis, and the most efficient IM-EDP prediction models are selected by comparing standard deviations of the regression errors. The maximum inter-story drift ratio of the shear-walls is less than 1% for the mainshock and mainshock-aftershock records. The energy-based damage index shows sensitivity to delineate impact of earthquake types and aftershocks. The cumulative absolute velocity is showed to be the most efficient IM for the energy-based damage index.
Highlights
MotivationSeismic performance of reinforced concrete (RC) shear wall systems designed with Canadian design codes has been investigated by various researchers (e.g., Tremblay et al, 2001; Adebar et al, 2010; Boivin and Paultre, 2010, 2012; Luu et al, 2014)
It is important to assess the seismic performance of the gravity frame system of the tall RC building by taking into account uncertainties associated with regional seismic hazards, ground motions, and seismic vulnerability
Seismic performance of an RC shear wall system designed with Canadian design codes has shown acceptable performance in terms of drift limits
Summary
Seismic performance of reinforced concrete (RC) shear wall systems designed with Canadian design codes has been investigated by various researchers (e.g., Tremblay et al, 2001; Adebar et al, 2010; Boivin and Paultre, 2010, 2012; Luu et al, 2014). Gravity frames located in the plastic hinge zone of the shear wall can experience excessive deformation and, if not detailed properly, can sustain severe damage (Adebar et al, 2010). This type of damage, for example, was reported in the 27 February 2010 Maule Chile earthquake (Naeim et al, 2011) and the 22 February 2011 Christchurch earthquake (Stirrat et al, 2014). For RC shear wall buildings, the drift-based damage indicator may show satisfactory seismic resistance performance while underestimating overall damage in the plastic region due to cyclic loading. Other damage indices that were proposed in the literature (e.g., Park and Ang, 1985; DiPasquale and Cakmak, 1989; Reinhorn and Valles, 1995) can be adopted
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