2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference


Title
Effect of Shear Span-to-Depth Ratio on the Seismic Performance of Reinforced Concrete Masonry Structural Walls with Boundary Elements

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Author(s)
Mr. Nader Aly, Concordia University (Presenter)
Dr. Khaled Galal, Concordia University
Abstract

Reinforced Concrete Masonry (RCM) is a competitive alternative construction material for buildings. It features relatively rapid construction with reasonably built-in sound proofing and fire insulation characteristics. The most common Seismic Force Resisting System (SFRS) in masonry buildings is RCM structural walls. In the 2015 edition of the National Building Code of Canada (NBCC-2015) a ductile category of RM shear walls was added. The Canadian masonry design standard (i.e. CSA S304-14) assigned special design and detailing requirements to the ductile walls to ensure its stable ductile response and to qualify for a higher ductility-related response modification factor (Rd). In RCM shear walls, the ductile response can be achieved by integrating confined masonry boundary elements to the ends of the rectangular walls. Majority of the tested RCM shear walls with boundary elements represented walls in low- to mid-rise buildings. Thus, the intent of this study is to investigate the structural performance of high-rise ductile RCM structural walls with boundary elements under reversed cyclic loading simulating seismic actions. This is achieved by testing two half-scale fully grouted RCM shear walls with boundary elements (i.e. end-confined) under quasi-static reversed cyclic loading and constant axial load. The walls are designed and constructed with similar geometry and material properties and tested under the same level of axial stress. The main parameter investigated in this study is the shear span-to-depth ratio. The tested specimens represented shear walls in 5-story and 10-story RCM buildings. The objective is to quantify the cyclic response of the new RCM shear walls ductile category and to provide experimental evidence of its stable ductile response for higher aspect ratios.