Journal Thin-Walled Structures - Requested Papers

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Shear lag analysis by the adaptive finite element method: 1. Analysis of simple plated structures

Author: C.K Lee, G.J Wu | Size: 1 MB | Format: PDF | Quality: Original preprint | Publisher: Thin-Walled Structures, Volume 38, Issue 4 | Year: December 2000 | pages: 285-309 | ISSN: 0263-8231

Due to the presence of sharp stress gradients, traditional finite element analysis using uniform meshes for the solution of shear lag problems for thin-walled structures is inefficient and will result in inaccurate values of effective breadth ratio. By using the adaptive finite element analysis, it is possible to obtain results with predetermined accuracy with a minimum amount of computational cost. An adaptive finite element analysis procedure is used to deal with the problem of shear lag effects of plated structures with arbitrary dimensions and geometry. This study consists of two parts. In Part 1 of the study, shear lag effects in simple plated structures, such as straight rectangular, single-cell box girders are studied. In Part 2 of the study, the adaptive refinement procedure will be extended to the shear lag analysis of complex plated structures such as core walls with openings, multi-cell box girders and box girders with curve flanges.

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Shear laganalysis by the adaptivefiniteelementmethod: 2. Analysis of complex plated structures

Author: C.K Lee, G.J Wu | Size: 1.4 MB | Format: PDF | Quality: Original preprint | Publisher: Thin-Walled Structures, Volume 38, Issue 4 | Year: December 2000 | pages: 311-336 | ISSN: 0263-8231

The adaptivefiniteelementanalysis procedure proposed in Part 1 of this study is employed to solve shear lag problems for complex plated structures with more general and complex geometries, including core walls with openings, multi-cell box girders and box girders with curved flanges. By using the adaptivefiniteelementmethod, parametric studies were carried out to investigate the influence of some key geometrical parameters on the shear lag effect for these types of structure. In addition, it is found that the adaptivefiniteelementmethod is a convenient tool for the shear laganalysis of structures with complicated geometry and multiple loading conditions, and could be used in day-to-day analyses.

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Membrane forces acting on thin-walled box girders considering shear lag effect

Author: Q.Z. Luo, J. Tang, Q.S. Li, G.D. Liu, J.R. Wu | Size: 0.3 MB | Format: PDF | Quality: Original preprint | Publisher: Thin-Walled Structures, Volume 42, Issue 5 | Year: May 2004 | pages: 741-757 | ISSN: 0263-8231

A new method for the determination of membrane forces acting on box girder bridges considering shear lag effect is proposed in this paper. A box girder is divided into four thin plate elements: top plate, bottom plate, cantilever and web. Using the equilibrium conditions of the plates, the membrane force equation for each plate element is established. The analytical formulas for calculating the membrane normal, transverse and shear forces of each plate element considering shear lag effect are derived. The proposed method is easy to implement in the design of thin-walled box girders considering shear lag effect.

Through examples using the high order finite strip element method and the experiment, the results obtained by the proposed method are examined and the accuracy of the proposed method is verified. The discussions on the shear lag effect on the membrane forces acting on cantilever box girders are given considering the variations of span to width ratio, width to height ratio and various loading conditions.

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