Experimental Study on Flexural Behavior of Strengthened Corrugated Steel Plate

Experimental study was conducted to verify the flexural strength of corrugated steel plate (CSP) for various types of reinforcement which include without stiffening ribs, with different thicknesses of additional steel ribs, and with steel ribs filled with concrete. The test results showed that the flexural strength of the strengthening structure of the additional steel plate using the same CSP as the main steel plate was more than 2 times that of the single CSP, and flexural strength of the concrete-filled corrugated plates showed at least 3.3 times higher flexural strength compared to the strength of single CSP. According to the force performance of the CSP strengthening structures, the nominal bearing capacity calculation formula was proposed. Specimens showed higher flexural strength than the nominal flexural capacity, indicating that the proposed formula of nominal flexural strength can effectively evaluate the strength of strengthening structures. A finite element model was established in ABAQUS software to verify the feasibility of nonlinear finite element method analysis on CSP strengthening structures and the parameter analysis was carried out. The simulation results showed that the reinforcement ratio had a great influence on the bearing capacity of the strengthening structure, and the bolt spacing was second. the compressive strength of concrete was not a significant improvement effect of the bearing capacity of concrete-encased corrugated stiffener structure, and the strength of concrete can be negligible. The optimization suggestions were proposed for the strengthening structure concerning other factors such as bolt spacing and strengthening ratio.