Experimental Research on Mechanical Properties of Tension-Compression Composite Bolts

Chen Mingyou; Zeng Juncheng; Cheng Dong; Chen Zhiwei; Wu Shaofeng; Cai Jianguo

doi:10.13206/j.gjgS25110201

Volume 41 Issue 1

Jan. 2026

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Chen Mingyou, Zeng Juncheng, Cheng Dong, Chen Zhiwei, Wu Shaofeng, Cai Jianguo. Experimental Research on Mechanical Properties of Tension-Compression Composite Bolts[J]. STEEL CONSTRUCTION(Chinese & English), 2026, 41(1): 31-38. doi: 10.13206/j.gjgS25110201

Citation:

Chen Mingyou, Zeng Juncheng, Cheng Dong, Chen Zhiwei, Wu Shaofeng, Cai Jianguo. Experimental Research on Mechanical Properties of Tension-Compression Composite Bolts[J]. STEEL CONSTRUCTION(Chinese & English), 2026, 41(1): 31-38. doi: 10.13206/j.gjgS25110201

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Experimental Research on Mechanical Properties of Tension-Compression Composite Bolts

doi: 10.13206/j.gjgS25110201

1. Ningde Ninggu Expressway Co., Ltd., Ningde 352100, China;
2. Fujian Provincial Highway Technology Innovation Research Institute Co., Ltd., Fuzhou 350001, China;
3. College of Civil Engineering, Southeast University, Nanjing 211189, China

Received Date: 2025-11-02
Available Online: 2026-02-26
Publish Date: 2026-01-22

Abstract

Abstract

Bolt reinforcement technology has been widely used in supporting structures for slope engineering. However， traditional bolts are difficult to balance high strength and high ductility under complex conditions， such as those encountered in high and steep slopes. This study employed Twinning-Induced Plasticity （TWIP） steel as the material for the compression-bearing anchorage section， introduced a tension-compression composite bolt system， and developed a new type of anchorage structure with both high bearing capacity and large deformation capacity. Through pull-out tests， the mechanical properties of three types of bolts were compared and analyzed： TWIP steel tension-type bolts， traditional HRB400 tension-type bolts， and TWIP/HRB400 tension-compression composite bolts. The results showed that all tension-compression composite bolts experienced fracture of the TWIP steel rod， with an ultimate load ranging from 260.89 to 265.82 kN， which was twice that of HRB400 tension-type bolts. In terms of deformation capacity， the displacement at the ultimate load was approximately 207 mm， 3.25 times that of HRB400 tension-type bolts and 51 times that of TWIP steel tension-type bolts. The strain rate in the parallel section of the TWIP steel reached 53.7%， demonstrating significant high-ductility characteristics. The shear stress distribution in tension-compression composite bolts was more reasonable. The shear stress at the bearing plate did not reach the ultimate bond strength， and no slippage occurred. In the initial loading stage， the load was primarily borne by the compression-bearing anchorage section. After the displacement reached 80 mm， it transferred to the tension-bearing anchorage section， with the two sections working together in good synergy. These research findings provide theoretical support for the application of tension-compression composite bolts in complex geotechnical engineering.
- tension-compression composite bolt,
- TWIP steel,
- mechanical property,
- pull-out test,
- ultimate bearing capacity

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References(26)

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