Abstract
The seismic performance of ordinary reinforced concrete shear walls, that are commonly used in high-rise residential buildings in Korea (h < 60 m), but are prohibited for tall buildings (h ≥ 60 m), is evaluated in this research project within the framework of collapse probability. Three bidimensional analytical models comprised of both coupled and uncoupled shear walls exceeding 60 m in height were designed using nonlinear dynamic analysis in accordance with Korean performance-based seismic design guidelines. Seismic design based on nonlinear dynamic analysis was performed using different shear force amplification factors in order to determine an appropriate factor. Then, an incremental dynamic analysis was performed to evaluate collapse fragility in accordance with the (Federal Emergency Management Agency) FEMA P695 procedure. Four engineering demand parameters including inter-story drift, plastic hinge rotation angle, concrete compressive strain and shear force were introduced to investigate the collapse probability of the designed analytical models. For all analytical models, flexural failure was the primary failure mode but shear force amplification factors played an important role in order to meet the requirement on collapse probability. High-rise ordinary reinforced concrete shear walls designed using seven pairs of ground motion components and a shear force amplification factor ≥ 1.2 were adequate to satisfy the criteria on collapse probability and the collapse margin ratio prescribed in FEMA P695.
Highlights
Performance-based seismic design has been applied to high-rise buildings increasingly inSouth Korea as well as the USA, owing to progress in nonlinear structural analysis techniques and relevant design guidelines
In Korean Building Code (KBC) 2016, the performance-based seismic design is introduced for the first time and defined as a design method to achieve performance objectives using nonlinear analysis considering inelastic deformation capacity and the over-strength of structures more precisely, and it can be applied to structures in which the design coefficients for elastic design are uncertain or structures required to meet various performance objectives [1]
This is because ordinary reinforced concrete (RC) shear walls are not permitted in the elastic design for buildings that belong to seismic design category D and are taller than 60 m
Summary
Performance-based seismic design has been applied to high-rise buildings increasingly in. In South Korea, performance-based seismic design is mostly applied to high-rise apartment buildings in which ordinary reinforced concrete (RC) shear walls are used to resist seismic forces. This is because ordinary RC shear walls are not permitted in the elastic design for buildings that belong to seismic design category D and are taller than 60 m. The seismic fragility assessment of high-rise ordinary RC shear walls over 60 m designed through performance-based seismic design is conducted to verify whether those structures have adequate collapse margin ratios. Three analytical models composed of ordinary RC shear walls typical in South Korea but with different heights are designed in accordance with the AIK guidelines using nonlinear response history analysis using seven pairs of horizontal ground motion components. Criteria on the conditional collapse probability and the collapse margin ratio (CMR) are evaluated in accordance with FEMA P695
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