Finite Beam Element Considering Shear-Lag Effect in Box Girder
Publication: Journal of Engineering Mechanics
Volume 136, Issue 9
Abstract
A finite-element method considering the interaction of the bending and shear-lag deformation of a box girder was established. Meanwhile a shear-lag-induced stiffness matrix was defined. The stiffness matrices considering the effect of the shear lag were deduced. At each node of the beam element, two shear-lag degrees of freedom were used as boundary conditions for the box girders. The proposed formulations were then applied to analyze the effects of the shear lag on the deflection, the internal forces, and the shear-lag coefficients in the simply supported cantilever and continuous box beams under uniformly distributed and concentrated loads. The numerical results obtained using the proposed procedure were in good agreement with those using the finite-shell-element method, the finite-stringer method, the analytical method based on the variational principle, and the model tests. The proposed method is reliable and more effective for the analysis of the shear lag in the actual box-girder structures.
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© 2010 ASCE.
History
Received: Jul 11, 2008
Accepted: Feb 26, 2010
Published online: Feb 27, 2010
Published in print: Sep 2010
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