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Experimental study on the shear behavior of the interface between cushion materials and the concrete raft

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Abstract

Cushion is a layer of granular materials between the raft and the ground. The shear behavior of the interface between the cushion and the raft may influence the seismic performance of the superstructure. In order to quantify such influences, horizontal shear tests on the interfaces between different cushion materials and concrete raft under monotonic and cyclic loading were carried out. The vertical pressure Pv, material type and cushion thickness hc were taken as variables. Conclusions include: 1) under monotonic loading, Pv is the most significant factor; the shear resistance Phmax increases as Pv increases, but the normalized factor of resistance μn has an opposite tendency; 2) for the materials used in this study, μn varies from 0.40 to 0.70, the interface friction angle δs varies from 20° to 35°, while umax varies from 3 mm to 15 mm; 3) under cyclic loading, the interface behavior can be abstracted as a “three-segment” back-bone curve, the main parameters include μn, the displacement u1 and stiffness K1 of the elastic stage, the displacement u2 and stiffness K2 of the plastic stage; 4) by observation and statistical analysis, the significance of different factors, together with values of K1, K2 and μn have been obtained.

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Acknowledgement

The authors would like to acknowledge the support received from the State Key Laboratory of Subtropical Building Science at South China University of Technology (Project No. 2011ZA05). The first author would like to acknowledge FRQNT (Fonds de Recherche du Québec-Nature et Technologies) for its support by Québec-China postdoctoral merit scholarship program for foreign students.

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Authors and Affiliations

  1. State Key Laboratory of Subtropical Building Science, South China University of Technology, Guangzhou, 510641, China

    Yaokun Li, Xiaolei Han & Jing Ji

  2. Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, Quebec, H3G 2W1, Canada

    Yaokun Li & Khaled Galal

  3. Department of Building, Civil and Environmental Engineering, Concordia University, 1515 St. Catherine West, EV-6.167, Montreal, Quebec, H3G 2W1, Canada

    Khaled Galal

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  1. Yaokun Li
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  2. Xiaolei Han
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  3. Khaled Galal
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  4. Jing Ji
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Correspondence to Khaled Galal.

Additional information

Supported by: the State Key Laboratory of Subtropical Building Science at South China University of Technology under Grant No. 2011ZA05, and Québec-China postdoctoral merit scholarship program for foreign students

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Li, Y., Han, X., Galal, K. et al. Experimental study on the shear behavior of the interface between cushion materials and the concrete raft. Earthq. Eng. Eng. Vib. 17, 165–178 (2018). https://doi.org/10.1007/s11803-018-0432-2

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  • DOI: https://doi.org/10.1007/s11803-018-0432-2

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