Abstract
Despite the construction of several curved prestressed concrete girder bridges with corrugated steel webs (CSWs) around the world; their shear behavior has seldom been investigated. Accordingly, this paper substitutes the lack of available information on the global elastic shear buckling of a plane curved corrugated steel web (PCCSW) in a curved girder. This is based on the equilibrium equations and geometric equations in the elastic theory of classical shells, combined with the constitutive relation of orthotropic shells. Currently, the global elastic shear buckling process of the PCCSW in a curved girder is studied, for the first time in literature, with an equivalent orthotropic open circular cylindrical shell (OOCCS) model. The governing differential equation of global elastic shear buckling of the PCCSW, as well as its buckling strength, is derived by considering the orthotropic characteristics of a corrugated steel web, the rational trigonometric displacement modes, Galerkin’s method and variational principles. Additionally, the accuracy of the proposed theoretical formula is verified by comparison with finite element (FE) results. Moreover, the expressions of the inner or outer folded angle and radius of curvature are given by the cosine theorem of the trigonometric function and inverse trigonometric function. Subsequently, parametric analysis of the shear buckling behavior of the PCCSW is carried out by considering the cases where the radius of curvature is constant or variable. This parametric analysis highlights the effects of web dimensions, height-to-thickness ratio, aspect ratios of longitudinal and inclined panels, corrugation height, curvature radius and folded angles on the elastic shear buckling strength. As a result, this study provides a theoretical reference for the design and application of composite curved girders with CSWs.
Highlights
The prestressed concrete girder bridge with corrugated steel webs (CSWs) is a novel type of composite structure
Through a reasonable dis-placement mode, the critical shear stress of the plane curved corrugated steel web (PCCSW) of a composite curved girder was obtained by using the Galerkin method and the variational extremum principle
The correctness of the proposed theoretical buckling formula was verified by the parametric analysis of a series of finite element models
Summary
The prestressed concrete girder bridge with corrugated steel webs (CSWs) is a novel type of composite structure. Compared with traditional concrete webs, CSWs can the structural strength-to-weight solve the problem of web cracking and improve, to some extent, the span capacity This novel structure, increases the structural strength-to-weight ratio. Compared with traditional concrete webs, CSWs has many other advantages, such as low manufacturing cost, high prestressing efficiency and can solve the problem of web cracking and improve, to some extent, the span capacity.
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