Research on Microstructure and Mechanical Properties of Cold-Rolled Threaded Prestressed Rebars for Prefabricated Piers of Xiangan Bridge

LIN Lihua; FU Yanqing; CHANG Hailin; ZHANG Jing; LI Jie

doi:10.13204/j.gyjzG23031306

Volume 53 Issue 8

Aug. 2023

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Article Navigation > INDUSTRIAL CONSTRUCTION > 2023 > 53(8): 199-205

LIN Lihua, FU Yanqing, CHANG Hailin, ZHANG Jing, LI Jie. Research on Microstructure and Mechanical Properties of Cold-Rolled Threaded Prestressed Rebars for Prefabricated Piers of Xiangan Bridge[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(8): 199-205. doi: 10.13204/j.gyjzG23031306

Citation:

LIN Lihua, FU Yanqing, CHANG Hailin, ZHANG Jing, LI Jie. Research on Microstructure and Mechanical Properties of Cold-Rolled Threaded Prestressed Rebars for Prefabricated Piers of Xiangan Bridge[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(8): 199-205. doi: 10.13204/j.gyjzG23031306

Citation:

LIN Lihua, FU Yanqing, CHANG Hailin, ZHANG Jing, LI Jie. Research on Microstructure and Mechanical Properties of Cold-Rolled Threaded Prestressed Rebars for Prefabricated Piers of Xiangan Bridge[J]. INDUSTRIAL CONSTRUCTION, 2023, 53(8): 199-205. doi: 10.13204/j.gyjzG23031306

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Research on Microstructure and Mechanical Properties of Cold-Rolled Threaded Prestressed Rebars for Prefabricated Piers of Xiangan Bridge

doi: 10.13204/j.gyjzG23031306

LIN Lihua¹,
FU Yanqing^{2,3,4
,
,},
CHANG Hailin^2,3,
ZHANG Jing^2,3,
LI Jie^2,3

1. Xiamen Road and Bridge Construction Group Co., Ltd., Xiamen 361000, China;
2. Central Research Institute of Building and Construction Co., Ltd., MCC Group, Beijing 100088, China;
3. Inspection and Certification Co., Ltd., MCC, Beijing 100088, China;
4. School of Civil Engineering, Southwest Jiaotong University, Chengdu 610031, China

Received Date: 2023-03-13
Available Online: 2023-10-17

Abstract

Abstract

Based on the connection design of the prestressed system for the prefabricated piers of Xiangan Bridge in Xiamen City, the mechanical properties of cold-rolled threaded prestressed rebars in the prestressed connection system were studied. The cross-sectional organization analysis, uniaxial tensile test, and fatigue performance test of 75 mm diameter cold-rolled threaded prestressed rebars were carried out. The results showed that there was some inhomogeneity in the cross-sectional organization of 75 mm diameter cold-rolled threaded prestressed rebars, and the heat treatment process still could be improved; the uniaxial stress-strain curve of cold-rolled threaded prestressed rebars had no yield platform; considering the efficiency and accuracy of calculation, it was suggested that the multi-fold model should be adopted to calculate the cold-rolled threaded prestressed rebars in the structural calculation model at the design stage. Under normal use conditions or frequently encountered loads, the design requirements for the upper limit of rebars should be lower than the yield point σ_0.2; improving the heat treatment parameters could effectively improve the fatigue performance of cold-rolled threaded prestressed rebars.
- prefabricated piers,
- prestressed rebar,
- large diameter,
- cold rolling,
- microstructure,
- mechanical properties

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References(15)

References

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