Numerical Analysis of Bending Mechanical Properties of Flange Joint of Corrugated Steel Lining
(1. Department of Geotechnical Engineering, College of Civil Engineering, Tongji University, Shanghai 200092; 2. Key Laboratory of Geotechnical and Underground Engineering of the Ministry of Education, Tongji University, Shanghai 200092)
Abstract：
In order to further investigate the bending mechanical properties of the flange joint of corrugated steel lining and the influencing factors, the four-point bending calculation model for flange joint of corrugated steel lining has been created and its accuracy has been verified. An orthogonal test is designed, where the corrugated steel model,flange plate thickness and bolt model are the variables. The failure modes are identified by using the deformation contour plot. The variance analysis and range analysis of the origin stiffness and ultimate bending moment of M-θ curve are conducted. Then the mechanism of interaction of the components in the case of structural failure is revealed with the help of the stress-bending moment curves of flange plate and bolt. At last, the bending moment coefficient α is proposed, to quantitatively differentiate the types of flange joints. As the study results indicate: the stiffness of the structure origin is affected by the corrugated steel model the most. Under positive bending moment load, the ultimate bending moment is dominated by the flange plate, and the failure mode is out-of-plane buckling of flange plate; bolts do not affect it much, but the stress is already at its limit. Under negative bending moment load,the ultimate bending moment is affected by both the bolt and flange plate, and the failure mode can be controlled by the flange plate, bolt or both; the relative bending moment coefficient α proposed can be used to quantitatively and accurately identify the failure mode. Under pure bending load, the maximum Mises stress of flange plate and bolt experiences four-stage growth. Under negative moment load, the maximum Mises stress of flange plate does not change significantly with the bolt model.
2024, Vol. 61 