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Analysis of Load Transfer of Fully Bonded Anchor Bolts under High Ground Temperature
(1 School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031; 2 Yantai Architectural Design and Research Co., Ltd.,Yantai 264000; 3 Shanghai Municipal Engineering Design and Research Institute (Group) Co., Ltd., Shanghai 200092)
Abstract In order to explore the influences of high ground temperature on the anchoring of fully bonded anchor bolts, this paper introduces a thermal variable equation related to material parameters of the anchoring system based on the previously derived stress distribution function of fully bonded anchor bolts, and establishes a temperature parameters inclusive mechanical model of fully bonded anchor bolts at elastic stage. Through calculation examples,this paper summarizes the change laws of mechanical properties with three different temperatures (50°C, 100°C and 150°C). In addition, it verifies the influences of temperature on the bond performance of fully bonded anchor bolts by the indoor pull-out test. The results show that: (1) as the temperature increases, the axial force at the same anchoring point of the anchor bolt increases, the maximum attenuation section of the axial force moves inwards, the peak shear stress decreases, and the peak point of the shear stress moves inwards; (2) as the temperature increases,the effective anchoring length of the anchor bolt in model 1 increases from 1.8 m to 2.8 m, the peak shear stress decreases by 21% and 34% respectively compared to that at 50 ℃, and the peak point of the shear stress moves inwards from 0.44 m to 0.79 m; (3) as the temperature increases, the peak shear stress of the fully bonded anchor bolt decreases, the load transfer length of the anchor bolt increases, and the transfer efficiency is reduced.
Abstract：
In order to explore the influences of high ground temperature on the anchoring of fully bonded anchor bolts, this paper introduces a thermal variable equation related to material parameters of the anchoring system based on the previously derived stress distribution function of fully bonded anchor bolts, and establishes a temperature parameters inclusive mechanical model of fully bonded anchor bolts at elastic stage. Through calculation examples,this paper summarizes the change laws of mechanical properties with three different temperatures (50°C, 100°C and 150°C). In addition, it verifies the influences of temperature on the bond performance of fully bonded anchor bolts by the indoor pull-out test. The results show that: (1) as the temperature increases, the axial force at the same anchoring point of the anchor bolt increases, the maximum attenuation section of the axial force moves inwards, the peak shear stress decreases, and the peak point of the shear stress moves inwards; (2) as the temperature increases,the effective anchoring length of the anchor bolt in model 1 increases from 1.8 m to 2.8 m, the peak shear stress decreases by 21% and 34% respectively compared to that at 50 ℃, and the peak point of the shear stress moves inwards from 0.44 m to 0.79 m; (3) as the temperature increases, the peak shear stress of the fully bonded anchor bolt decreases, the load transfer length of the anchor bolt increases, and the transfer efficiency is reduced.
LI Fuhai1 LI Rui1 WU Haonan1 GAO Hao1 WANG Bo1 ZHANG Guibin2 CHEN Siyin3
.Analysis of Load Transfer of Fully Bonded Anchor Bolts under High Ground Temperature[J] MODERN TUNNELLING TECHNOLOGY, 2021,V58(4): 157-162
2021, Vol. 58 