Experimental study on shear mechanical properties of cement mortar specimen with through-step joints under direct shear
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Hunan Provincial Key Laboratory of Hydropower Development Key Technology, Power China Zhongnan Engineering Corporation Limited, Changsha 410014, China
Geotechnical Engineering Department, Nanjing Hydraulic Research Institute, Nanjing, 210029, China
Civil and Environmental Engineering Department, Carnegie Mellon University, Pittsburgh 15289, United States
Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China
School of Civil Engineering and Architecture, East China Jiaotong University, Nanchang 330013, China
Submission date: 2021-10-06
Final revision date: 2022-04-01
Acceptance date: 2022-07-12
Publication date: 2022-12-30
Archives of Civil Engineering 2022;68(4):45-61
In this study, direct shear tests were carried out on cement mortar specimens with singleladder, single-rectangular, and double-rectangular step joints. Consequently, the shear strength, and crack shape of specimens with these through-step joints were analyzed, for understanding the influence of the through-step joint’s shape on the direct shear mechanical properties. The results of the investigation are as follows: (1) Under the same normal stress, any increases in the height ℎ of the step joint causes an initial-increase-decrease in the shear strengths of specimens with single-ladder and double-rectangular step joints, causing a type-Wvariation pattern for the specimens with single-rectangular step joint. More essentially, when normal stress and ℎ are constant, the shear strength of specimens with a single-ladder step joint is the greatest, followed by specimens with a double-rectangular step joint, and then specimens with a single-rectangular step joint is the least. (2) Furthermore, given a smallℎ and low normal stress, specimen with a single-ladder step joint mainly experiences shear failure, whereas specimens with single-rectangular and double-rectangular step joints mainly generate extrusion milling in the step joints.
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