Ultimate Drift Capacity for Slender RC Walls

Abstract eng:
A revised edition of Standards for Structural Calculation of RC Structures was published by the Architectural Institute of Japan in 2010. It relaxed requirements on boundary columns and allows the design of rectangular section walls. However, boundary end region should be well confined so that structural walls with a rectangular section have similar seismic performance to those with boundary columns. In the meantime, the 2010 Chile Off-Maule Earthquake and the 2011 Christchurch Earthquake revealed weakness of slender RC walls which suffered flexural failures due to crushing of concrete or buckling and fracture of longitudinal reinforcement at boundary regions. Damage in two earthquakes urged the international engineering society to evaluate the ultimate drift capacity and failure modes of RC walls with higher accuracy. In order to simulate compression controlled flexural failure, a fiber based model was constructed and calibrated using series of experimental studies conducted on reinforced concrete walls last several years in Japan. Then a parametric study was carried out with the fiber based model to simulate the hysteresis curves of walls to see effects of three variables on the load and drift level of characteristic points of a backbone curve. Three variables were concrete compressive strength (30MPa – 60MPa), confining reinforcement ratio in boundary regions (1.1% - 3.2%) and axial load ratio (0% - 50%). The parametric study showed that three variables have different degree of influences on the features of backbone curves and the axial load ratio is the most influential factor on the ultimate drift capacity.

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