Study on calculation method of new corrugated steel reinforcement structure of highway tunnel

Corrugated steel, a new structure, shows great advantages in many fields, however, it is rarely used in the reinforcement of highway tunnels. Besides, corresponding design method and mechanical properties are still not clear yet. In this study, a full-scale test is carried out to explore the calculation method of corrugated steel as a new reinforcement structure. Combining with numerical simulation and theoretical calculation, the load-deflection law of corrugated steel is revealed, which has a two-stage stiffness characteristic (anti-backlash stage and elastic stage). Equivalent stiffness coefficient is proposed to establish a simplified calculation method of the equivalent stiffness of corrugated steel. And RDP (Ratio of Depth to Pitch) is the main factor affecting the equivalent stiffness coefficient.