Abstract: Embedded corrugated steel components exhibit insufficient bearing capacity and stiffness. Therefore, inverted reinforced corrugated steel components are constructed. The flexural performance and interactions between components are examined using four-point bending tests under different reinforcement rib widths and in the presence and absence of concrete fill. Further, a theoretical model is proposed based on the partial interaction theory. Finally, a flexural performance solution program is prepared using the test-shot method and forward iterative difference method, implemented in Python. The findings are as follows. (1) Compared with traditional corrugated steel components with the same waveform, the flexural load capacity and rigidity of the inverted reinforced corrugated steel components increase by 1.0－2.5 and 1.3－6.2 times, respectively. The combined stress characteristics increase the flexural capacity and stiffness more than the steel consumption. (2) Filling the cavity with concrete further enhances the bearing capacity and stiffness. The supporting and restraining effects of the corrugated steel components enable the full performance of concrete. Stud connectors between corrugated steel components and concrete do not substantially enhance the bearing capacity. (3) Based on the partial interaction theory, the equilibrium and deformation coordination equations and the relationship between the interface tangential stress and internal force are derived. The solution program for the bending performance is developed using the test-shot and forward iterative difference methods. A comparison between computational and experimental results confirms that the solution program can reproduce the member stiffness degradation process with good robustness and convergence.

Key words: tunnel engineering, inverted reinforced corrugated steel component, flexural performance, partial interaction theory, solution program