Study on the High-Temperature Mechanical Behavior and Parameters of Joints: a Case of a Prefabricated Frame Tunnel

Joints are the weak parts of the prefabricated frame tunnels, and their mechanical behavior under high temperature conditions is not clear. In this research, a thermal-mechanical coupling numerical model of the tunnel joint is established with reference to an actual assembled frame tunnel. The flexu...

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Bibliographic Details
Published in:KSCE journal of civil engineering 2024, 28(9), , pp.4158-4174
Main Authors: Huang, Zhen, Ye, Zhangqian, Hu, Zhaojian, Zhang, Jiawei, Cao, Chen
Format: Article
Language:English
Subjects:
Axial forces
Bearing capacity
Bend strength
Bolted joints
Civil Engineering
Concrete
Concrete properties
Deformation
Diameters
Engineering
Fire resistance
Geotechnical Engineering & Applied Earth Sciences
Heat resistance
Heat resistant steels
High temperature
Industrial Pollution Prevention
Mathematical models
Mechanical properties
Numerical models
Parameters
Prefabrication
Reinforcing steels
Room temperature
Shear
Steel
Steel plates
Temperature
Thickness
Tunnel Engineering
Tunnels
토목공학
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Summary:Joints are the weak parts of the prefabricated frame tunnels, and their mechanical behavior under high temperature conditions is not clear. In this research, a thermal-mechanical coupling numerical model of the tunnel joint is established with reference to an actual assembled frame tunnel. The flexural and shear performance of the joint at room temperature and high temperature are investigated. The effects of axial force, steel plate thickness, steel box thickness, bolt diameter, concrete strength and steel bar diameter on the mechanical properties of the joint are analysed, and the importance of these parameters is evaluated by grey relational analysis. The results show that the flexural and shear bearing capacities of this type of joint decrease significantly at high temperature. The longitudinal rebar diameter and concrete strength play a leading role in the bending capacity of the joint. The concrete strength and steel plate thickness play a dominant role in the shear capacity of the joint. The combination of steel plates and bolts limits the dislocation displacement of the joint, especially when the steel plate thickness is 30 mm, and the shear capacity of the joint significantly improves. The study results can support the fire resistance design of prefabricated tunnels.
ISSN:1226-7988
1976-3808
DOI:10.1007/s12205-024-0131-7