Shan Renliang, Xiao Shengchao, Li Yongzhen, Zhao Xinpeng, Han Tianyu, Zhang Shupeng
China University of Mining and Technology (Beijing), Beijing, 100080, China.
Sci Rep. 2024 Mar 28;14(1):7425. doi: 10.1038/s41598-024-58085-9.
To examine the disparity in deformation behavior and mechanical qualities between anchor cables with C-shaped tubes and regular anchor cables under shear conditions. The double-sided shear tests of free-section anchor cables and anchor cables with C-shaped tubes were conducted utilizing the indoor large-scale double-shear test equipment with varying pretension loads. The indoor double-shear tests indicate that the inclusion of the C-shaped tube alters the stress distribution of the anchor cables inside the anchor cables with C-shaped tubes and mitigates the impact of stress concentration. Moreover, it facilitates the transition of the anchor cable's failure mode from a mix of tensile and shear breaking to mainly tensile breakage. In addition, ABAQUS finite element analysis software was used to establish a double shear test model of the anchor cable with C-shaped tube to accurately simulate the interaction and stress distribution among the anchor cable, C-shaped tube, and concrete block in the double shear test. The findings of the simulation results reveal that the numerical model can adequately depict the evolution of the stress distribution in the prestressed anchored structure and the damage of the concrete block with increasing shear displacement. The relational equation for the yield state of the anchor cable with C-shaped tube under combined tensile and shear loads is found by integrating the experimental and simulation data, the static beam theory, and the concept of minimal potential energy.
为研究带C形管锚索与普通锚索在剪切条件下变形行为和力学性能的差异。利用室内大型双剪试验装置，对自由段锚索和带C形管锚索进行了不同预紧力载荷下的双面剪切试验。室内双剪试验表明，C形管的加入改变了带C形管锚索内部锚索的应力分布，减轻了应力集中的影响。此外，它促进了锚索破坏模式从拉伸和剪切破坏混合向主要拉伸破坏的转变。另外，利用ABAQUS有限元分析软件建立了带C形管锚索的双剪试验模型，以准确模拟双剪试验中锚索、C形管和混凝土块之间的相互作用及应力分布。模拟结果表明，该数值模型能够充分描述预应力锚固结构中应力分布的演变以及随着剪切位移增加混凝土块的损伤情况。通过整合试验和模拟数据、静梁理论以及最小势能概念，得到了带C形管锚索在拉剪复合载荷作用下的屈服状态关系方程。
