کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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514763 | 866808 | 2008 | 11 صفحه PDF | دانلود رایگان |
An analysis method for moving loads computes the internal force history in a structural member at the integration points of force-based finite elements as opposed to the end forces of a refined displacement-based finite element mesh. The force-based formulation satisfies strong equilibrium of internal section forces with the element end forces and the moving load. This is in contrast with displacement-based finite element formulations that violate equilibrium between the section forces and the equivalent end forces computed for the moving load. A new approach to numerical quadrature in force-based elements allows the specification of integration point locations where the section demand is critical while ensuring a sufficient level of integration accuracy over the element domain. Influence lines computed by numerical integration in force-based elements converge to the exact solution and accurate results are obtained for practical applications in structural engineering through the new low-order integration approach. The proposed methodology for moving load analysis has been incorporated in automated software to load rate a large number of bridges efficiently.
Journal: Finite Elements in Analysis and Design - Volume 44, Issue 4, February 2008, Pages 214–224