Abstract
A study was conducted to clarify the influence of reinforcement detailing, slenderness and loading type on the capacity, damages and failure modes of confined boundary regions of reinforced concrete (RC) cantilever walls. It was found that the tensile strain prior to compressive strain affected the performance of thin wall boundaries and may lead to different failure modes compared to compression load only. It was also found that dense transverse reinforcement detailing in thin confined boundaries did not improve their performance. Some design and detailing practices were evaluated to determine their accuracy in preventing global buckling and bar buckling under extreme lateral loading. Numerical model that take into account reinforcing bar buckling was proposed to simulate the behaviour of specimens tested under monotonic condition. The model could simulate the observed response with good accuracy.
Highlights
Following the 2010 Chile and the 2012 New Zealand earthquakes, observed damages in reinforced concrete (RC) wall buildings raised concern about the seismic performance of rectangular RC walls
Structural wall damages of boundary regions included spalling and crushing of concrete, often spread over the entire wall width, longitudinal reinforcement in those regions fractured under tension or buckled under compression, and apparent out-of-plan wall buckling was observed in some damaged buildings [1,2,3]
It is important to predict the influence of ultimate failure mode on ultimate drift capacity of RC walls and build numerical model able to take into account these damage situations
Summary
Following the 2010 Chile and the 2012 New Zealand earthquakes, observed damages in RC wall buildings raised concern about the seismic performance of rectangular RC walls. In these earthquakes, severe damage happened to concrete walls in numerous walled buildings leading to partial or total collapse. It was reported that lack of adequate confinement and detailing in boundary regions was one of the main causes of those damages These observations raise questions about the mechanisms that lead to reinforcing bars buckling, concrete crushing, and global wall buckling, as well as the quantity and configuration of transverse reinforcement at wall boundaries required to ensure good performance. It is important to predict the influence of ultimate failure mode on ultimate drift capacity of RC walls and build numerical model able to take into account these damage situations
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