Updating the Semi-rigidity of Joints and Boundary Conditions of Structures Using a Hybrid Finite Element

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Journal of Vibration and Shock ›› 2009, Vol. 28 ›› Issue (9) : 39-47.

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Updating the Semi-rigidity of Joints and Boundary Conditions of Structures Using a Hybrid Finite Element

Yang Liu Zhongdong Duan

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Abstract

In this paper, updating the finite element model of semi-rigid jointed structures is studied. Firstly, a hybrid finite element is proposed, composed of a beam element with two connections at both ends, in order to consider the semi-rigidity of joints of both rotation and shear effect. This hybrid finite element is suitable for model updating, and the stiffness matrix and mass matrix of the proposed element are described. Secondly, a parameterized scheme to update the boundary support parameters is presented. Finally, the proposed hybrid finite element and parameterized method are experimentally studied by updating the finite element of a 14-bay frame with test modal parameters. The results show that the proposed methods are suitable for model updating of semi-rigid jointed structures.

Key words

Structural model updating / Semi-rigid joints / Hybrid finite element / Optimization technique.

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Yang Liu Zhongdong Duan. Updating the Semi-rigidity of Joints and Boundary Conditions of Structures Using a Hybrid Finite Element[J]. Journal of Vibration and Shock, 2009, 28(9): 39-47