Semi-analytical thermo-mechanical model for the shield tunnel segmental joint subjected to elevated temperatures

• Thermo-mechanical model of shield tunnel segmental joint in fire is proposed and verified. Heat flow invading through the discussed quantified. Bolt location axial load are both critical for safety. The most component determining mechanical response concrete linings a shield-tunnel structure. Existing models have been developed mainly analysis lining design, but event fire, conditions that may experience could well exceed normal design range. Consequently, validity existing becomes questionable. In this paper, an improved semi-analytical thermo-mechanical derived based on general plane to consider thermal effect induced by elevated temperatures. As benchmark development model, laboratory experiment was conducted joints under heat transfer special were deduced theorical numerical methods. A finite element (FE) calibrated against experimental tests, whilst FE employed generate required parametric data, from which fitting function created. temperature adjustment coefficient introduced improve calculation section field. influence force bending moment also incorporated according stress state section. validation demonstrated comparisons with results tests. Finally, influences heating curves, bolt location, rotation stiffness investigated using model.