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Ho Chi Minh City, Vietnam

Vu T.-V.,iMinh City University of Architecture | Kim Y.-M.,Daewoo E&C Co. | Lee H.-E.,Korea University
KSCE Journal of Civil Engineering | Year: 2015

A convenient and effective finite element-based method for coupled flutter analysis of long-span bridges is presented. The exact formulation of the aerodynamic self-excited forces with eighteen flutter derivatives utilized by complex notation is proposed. The predictions of the flutter wind speed and the critical frequency are compared with those either given by existing methods or the wind tunnel test showing the effectiveness and accuracy of the present approach. Numerical flutter analysis for an asymmetric bridge is the application for engineering practice, and its obtained results highlight the important role of the first lateral bending and torsional mode in generating the coupled flutter. Multi-mode analyses that are based on only the symmetrical modes can predict accurately the bridge flutter onset. The consistent self-excited aerodynamic force formulations produce the flutter velocity that is closer to the experimental one of full-bridge model in the wind tunnel. © 2015 Korean Society of Civil Engineers and Springer-Verlag Berlin Heidelberg Source


Nguyen-Van H.,University of Southern Queensland | Nguyen-Van H.,iMinh City University of Architecture | Mai-Duy N.,University of Southern Queensland | Karunasena W.,University of Southern Queensland | Tran-Cong T.,University of Southern Queensland
Computers and Structures | Year: 2011

This paper presents buckling and free vibration analysis of composite plate/shell structures of various shapes, modulus ratios, span-to-thickness ratios, boundary conditions and lay-up sequences via a novel smoothed quadrilateral flat element. The element is developed by incorporating a strain smoothing technique into a flat shell approach. As a result, the evaluation of membrane, bending and geometric stiffness matrices are based on integration along the boundary of smoothing elements, which leads to accurate numerical solutions even with badly-shaped elements. Numerical examples and comparison with other existing solutions show that the present element is efficient, accurate and free of locking. © 2010 Elsevier B.V. Source


Nguyen N.D.,Dragages Singapore Pte Ltd. | Nguyen-Van H.,iMinh City University of Architecture | Han S.-Y.,Korea University | Choi J.-H.,Korea University | Kang Y.-J.,Korea University
International Journal of Steel Structures | Year: 2013

This paper deals with the elastic lateral-torsional buckling (LTB) strength of tapered I-girders with corrugated webs under two types of loading conditions: uniform moment and moment gradient with various end restraint conditions. A finite element (FE) program using beam elements is developed to study LTB behaviors. The results from this program are compared with those from the commercial software ABAQUS using shell elements. From the comparisons, it is found that the developed FE program's results agree well with the results from ABAQUS. For design purpose, the closed-form equations for the critical buckling moment of the tapered I-girder with corrugated webs under uniform moment and moment gradient with four types of end restraint conditions: simply supported, warping fixed, lateral bending fixed, and completely fixed are proposed based on the results from the developed FE program. From the numerical investigations, the new design equations give reasonably accurate results. These equations increase efficiency in bridges and buildings design. © 2013 Korean Society of Steel Construction and Springer-Verlag Berlin Heidelberg. Source

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