Shear Behavior of Squat Heavyweight Concrete Shear Walls with Construction Joints

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Title: Shear Behavior of Squat Heavyweight Concrete Shear Walls with Construction Joints

Author(s): Ju-Hyun Mun, Keun-Hyeok Yang, and Jin-Kyu Song

Publication: Structural Journal

Volume: 114

Issue: 04

Appears on pages(s): 1019-1029

Keywords: construction joint; heavyweight concrete; shear reinforcement; slip; squat shear wall

Date: 7/1/2017

Abstract:
This study examined the effectiveness of shear reinforcing bar configurations in enhancing the shear strength and restricting the slip displacement of squat heavyweight concrete (HWC) shear walls with smooth construction joints at the wall-base interface. Six shear wall specimens with barbell-shaped cross sections and aspect ratios of 1.0 were tested under constant axial loading and cyclic lateral loading. The behavior of all the tested walls was governed by shear, exhibiting severe inclined cracking at the web and sliding damage at the wall-base interface. For squat shear walls with aspect ratios of 1.0, vertical shear reinforcement is comparable to horizontal shear reinforcement in its ability to prevent a rapid decrease in loads after the peak strength, thereby restricting the propagation of inclined shear cracks and enhancing the shear strength of walls, whereas the former is more effective than the latter in preventing slip displacement at the wall-base interface. The slip displacement measured in a monolithic specimen was half that measured in a companion specimen with a smooth construction joint at the wall-base interface. Empirical equations proposed in ACI 318-14 and by Wood and the strut-and-tie model proposed by Hwang et al. were found to predict the shear strength of HWC shear walls more conservatively than that of normalweight concrete shear walls.