Experimental Study on the Mechanical Properties of Rock–Concrete Composite Specimens under Cyclic Loading

Experimental Study on the Mechanical Properties of Rock–Concrete Composite Specimens under Cyclic Loading Hongjun Li China Anergy Group Third Engineering Bureau Co., Ltd., Chengdu 610036, China Baoyun Zhao School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, China http://orcid.org/0000-0001-6778-2228 Zhengjun Hou Chengdu Sunvison Intelligent Technology Co., Ltd., Chengdu 610065, China Hongyao Min School of Civil Engineering and Architecture, Chongqing University of Science and Technology, Chongqing 401331, China

The foundations of bridges and other tall buildings are often subjected to cyclic loads. Therefore, it is essential to investigate the mechanical properties of rock–concrete composite foundations under cyclic loads. In this paper, uniaxial cyclic loading and unloading tests were conducted on rock–concrete composite specimens using the TFD-2000 microcomputer servo-controlled rock triaxial testing machine. The stress–strain curves, elastic modulus variation, and energy dissipation were analyzed. The results showed that the stress–strain curves of composite specimens under uniaxial cyclic loading and unloading conditions formed hysteresis loops. The hysteresis loop exhibited a sparse–dense–sparse pattern under the upper stress of 27.44 MPa, which was 90% of the uniaxial strength. The elastic modulus, as well as the dissipated energy, decreased rapidly in the first few cycles and then gradually decreased at a constant rate, with the upper stress increasing to 27.44 MPa. Both the elastic modulus and the dissipated energy exhibited an accelerated stage before specimen failure. The primary failure mode of the composite specimen was split failure from concrete to sandstone. A damage variable was derived to better reflect the laws governing the damage evolution of the composite under cyclic loads.
03 21 2024 854 buildings14030854 National Natural Science Foundation of China http://dx.doi.org/10.13039/501100001809 41302223 Scientific and Technological Research Program of Chongqing Municipal Education Commission http://dx.doi.org/10.13039/ KJZD-K202101505 Tibet Autonomous Region Science and Technology Program http://dx.doi.org/10.13039/ XZ202301ZY0037G https://creativecommons.org/licenses/by/4.0/ 10.3390/buildings14030854 https://www.mdpi.com/2075-5309/14/3/854 https://www.mdpi.com/2075-5309/14/3/854/pdf Xue Experimental study on effects of cyclic loading paths on cracking behavior and fracture characteristics of granite Eng. Fract. Mech. 2024 10.1016/j.engfracmech.2023.109761 295 109761 Liu A review of experimental and theoretical research on the deformation and failure behavior of rocks subjected to cyclic loading J. Rock Mech. Geotech. 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