Efficient Modal-Based Method for Analyzing Nonlinear Aerostatic Stability of Long-Span Bridges
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Efficient Modal-Based Method for Analyzing Nonlinear Aerostatic Stability of Long-Span BridgesDate
2021Citation
Cid Montoya, M., Hernández, S., Kareem, A., Nieto, F. (2021). Efficient modal-based method for analyzing nonlinear aerostatic stability of long-span bridges. Engineering Structures, 244, 112556. https://doi.org/10.1016/j.engstruct.2021.112556
Abstract
[Abstract] An efficient method for analyzing the nonlinear aerostatic stability of long-span bridges using a modal formulation is proposed. First, a simplified linear version defined as modal-based approach is introduced, which evaluates the bridge displacements using the modal properties of the bridge and speeds up the assessment of the critical velocity by applying a root-finding algorithm. Then, this scheme is further developed to identify the instability limit point in nonlinear structures by combining nonlinear FEM analyses with the linear version of the modal-based approach and a root-finding algorithm in an outer loop. The effects of considering the three components of the wind loads, the stays sag effect, structural nonlinearities, aerodynamic nonlinearities, and the initial wind angle of attack, are analyzed and discussed. The computational advantages of the proposed method and its accuracy are demonstrated through three application examples, including a simplified linear 1 DoF system, and linear and nonlinear FEM models of a full cable-stayed bridge. The collapse mechanism of the cable-stayed bridge is driven by the stiffness degradation of the stays caused by the deck vertical upward displacements. It has been found that the influence of the nonlinear aerodynamic features is very low when the structural nonlinearities control the bridge collapse.
Keywords
Aerostatic stability
Critical wind velocity
Dynamic analysis
Cable-stayed bridges
Nonlinear analysis
Cable sagging
Root-finding algorithms
FEM
Critical wind velocity
Dynamic analysis
Cable-stayed bridges
Nonlinear analysis
Cable sagging
Root-finding algorithms
FEM
Description
Financiado para publicación en acceso aberto: Universidade da Coruña/CISUG
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Atribución 4.0 Internacional (CC BY 4.0)