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- W251607811 abstract "The multimode eigenvalues of a bridge under strong winds with aeroelastic effects can be estimated through a complex eigenvalue analysis (e.g., Chen et al., 2000). These eigenvalues are commonly plotted versus mean wind velocity by a family of frequency and damping loci. Depending on the structural and aerodynamic characteristics of the bridge, two of these closely spaced eigenvalues may approach each other at a certain wind velocity range. It is interesting that when two frequency loci approach, the curves repel each other avoiding an intersection, whereas the eigenvectors associated with these two eigenvalues are interchanged as if the curves intersected (Chen et al., 2000; and Chen and Kareem, 2001). This is called as curve veering phenomenon that has also been observed in other structural dynamic problems (Chen and Ginsberg, 1992; and Morand and Ohayon 1995). A spring supported bridge section model with heaving and torsional degrees of freedom is commonly used in the wind tunnel investigation of flutter behavior of long span bridges. In most cases, the coupled flutter is initiated from the torsional branch. However, a heaving branch coupled flutter may also be observed in some cases when the torsional aerodynamic damping is relatively large (Matsumoto et al., 1999). The underlying physics and conditions of occurrence of this kind of flutter have not been clearly understood. This paper addresses the physics of curve veering of eigenvalue loci using spring-supported 2-DOF bridge section models and a long span suspension bridge. A closed form solution of 2-DOF flutter is provided based on a perturbation analysis. A criterion under which the eigenvalue loci veer is presented. The underlying physics of a heaving mode branch coupled flutter and multimode coupled flutter is discussed from the curve veering viewpoint. 2. CLOSED FORM SOLUTION OF 2-DOF COUPLED FLUTTER" @default.
- W251607811 created "2016-06-24" @default.
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- W251607811 date "2001-10-31" @default.
- W251607811 modified "2023-09-27" @default.
- W251607811 title "On the Veering of Eigenvalue Loci and the Physics of Coupled Flutter of Bridges" @default.
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