Nonlinear aeroelastic behavior of a base-isolated beam under steady wind flow. (March 2020)

• Record Type: Journal Article
• Authors: Di Nino, Simona; Luongo, Angelo
• Is Part Of: International journal of non-linear mechanics. Volume 119(2020)
• Publication Date: 2020-03
• Subjects: Aeroelastic nonlinear behavior -- Hopf bifurcation -- Base isolated shear-beam -- Nonlinear damping -- Perturbation analysis; Nonlinear mechanics -- Periodicals; Mécanique non linéaire -- Périodiques; Nonlinear mechanics; Periodicals; 531
• DOI: 10.1016/j.ijnonlinmec.2019.103340
• Languages: English
• ISSNs: 0020-7462

Abstract

Abstract: A homogeneous continuous visco-elastic shear-beam, describing the dynamics of base-isolated tall buildings exposed to a uniformly distributed steady wind flow, is studied. The shear beam is constrained at the bottom end by a nonlinear visco-elastic device and free at the top end. The aeroelastic effects, responsible for self-excitation, are evaluated via the quasi-static theory. The occurrence of Hopf bifurcation is detected. Critical and post-critical behavior is analyzed by applying a perturbation scheme. The critical wind velocity and the associated complex galloping mode are found. The steady value of the oscillation amplitude on the stable limit-cycle and its stability are evaluated as function of the mean wind velocity. The mechanical performances of the structure are investigated in according to the effectiveness of the visco-elastic isolation system. A passive controller is proposed to increase the galloping wind velocity and to reduce the amplitude of the limit-cycle.