Anchorage performance of new tension-compression anchor Ⅳ: numerical simulation

TU Bingxiong; WEI Jian; JIA Jinqin; YU Jin; LI Zhiwe; CAI Qipeng

doi:10.11779/CJGE20231016

Volume 46 Issue 12

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Chinese Journal of Geotechnical Engineering > 2024 > 46(12): 2642-2651. > DOI: 10.11779/CJGE20231016

TU Bingxiong, WEI Jian, JIA Jinqin, YU Jin, LI Zhiwe, CAI Qipeng. Anchorage performance of new tension-compression anchor Ⅳ: numerical simulation[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(12): 2642-2651. DOI: 10.11779/CJGE20231016

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Anchorage performance of new tension-compression anchor Ⅳ: numerical simulation

1.
Fujian Engineering Technology Research Center for Tunnel and Underground Space, Huaqiao University, Xiamen 361021, China
2.
School of Infrastructure Engineering, Dalian University of Technology, Dalian 116024, China
3.
Fujian Academy of Building Research CO., LTD., Fuzhou 350108, China
4.
Fujian Provincial Key Laboratory of Green Building Technology, Fuzhou 350108, China

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Received Date: October 15, 2023
Available Online: June 12, 2024

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Abstract

Abstract

The new tension-compression anchor (TC anchor) has excellent anchorage performance and obvious advantages in anti-floating engineering, gradually gaining widespread application. However, its load transfer mechanism has been not yet clearly understood. In light of this, a study on the load transfer mechanism of the TC anchor is conducted based on the completed field tests through the numerical simulation method. The results indicate that the axial tension in the rebar of the TC-anchor remains constant in the compression anchorage segment but significantly decreases after transferring to the tension anchorage segment. During failure, the tension bearing coefficient of the TC anchor is slightly lower than the tension length coefficient. In the compression anchorage segment, the grouting materials experience compression, with the compressive stress decreasing towards the head. In the tension anchorage segment, the grouting materials experience tension, and the tensile stress increases first and then decreases, and the maximum tensile stress is significantly lower than that of the wholly grouted anchor. Optimizing the tension-compression length ratio can further reduce the axial tensile stress in the grouting materials of the tension anchorage segment. The shear stress at the grout-soil interface of the TC anchor is the highest at the load-bearing body and decreases towards both sides. Compared to the wholly grouted anchor and pressure-type anchor under the same tension, the TC anchor exhibits significantly reduced shear stress at the grout-soil interface, weakened stress concentration, and a more uniform distribution.
- tension-compression anchor,
- shear stress,
- tension bearing coefficient,
- tension length coefficient,
- collaborative failure

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