Research on the wind-induced aero-elastic response of closed-type saddle-shaped tensioned membrane models

Abstract

Abstract:The aero-elastic instability mechanism of a tensioned membrane structure is studied in this paper. The response and wind velocities above two closed-type saddle-shaped tensioned membrane structures, with the same shape but different pretension levels, were measured in uniform flow and analyzed. The results indicate that, for most wind directions, several vibration modes are excited and the amplitude and damping ratio of the roof slowly increase with the on-coming flow velocity. However, for particular wind directions, only one vibration mode is excited, and the amplitude and damping ratio of the vibration mode increase slowly with the on-coming flow velocity. The aero-elastic instability is caused by vortex-induced resonance. On exceeding a certain wind speed, the amplitude of the roof vibration increases sharply and the damping ratio of the vibration mode decreases quickly to near zero; the frequency of the vortex above the roof is locked in by the vibration within a certain wind velocity range; the amplitudes of the roof in these wind directions reach 2-4 times the amplitudes for other wind directions. The reduced critical wind speeds for the aero-elastic instability of saddle-shaped membrane structures at the first two modes are around 0.8-1.0.

Analysis of Wind-Induced Vibration of a Spoke-Wise Cable–Membrane Structure

“…The Panofsky wind speed spectrum should be used for the simulation of horizontal and vertical winds. Then, the time history of wind load with 120 nodes can be generated by Equations (11) and (12).…”

“…In these two areas, the structure is more sensitive to the wind load. Based on the coefficient of wind pressure distribution, which is determined through the wind tunnel test, the time history of wind load can be calculated by Equation (12). Therefore, to a certain extent, these results reflect the influence of the environment where the buildings are located on the wind-induced vibration suffered by the structure.…”

“…They introduced and utilized the affecting tension and pressure functions for the wind flow with a constant velocity. Wu et al (2015) investigated the aero-elastic instability mechanism of two membrane structures in a uniform wind flow with the identical shape but with different pretension levels [12]. Wood et al [13] investigated in a wind tunnel experiments fluid-structure interaction of a thin-walled membranous hemispherical flexible structure and implemented measurements of the membrane oscillation.…”

Theoretical and Numerical Studies on Damped Nonlinear Vibration of Orthotropic Saddle Membrane Structures Excited by Hailstone Impact Load

“…e possibility of defining equivalent static pressure fields able to reproduce the envelope of dynamic displacements of the cables net was explored. Wu et al [27] studied the aeroelastic instability mechanism of a tensioned membrane structure.…”

LES of Unsteady Aerodynamic Forces on a Long-Span Curved Roof

“…Such structures are generally vulnerable to the dynamic wind actions because of low damping and frequency [1][2][3][4]. The wind-structure interaction induces unsteady aerodynamic forces, or motion-induced wind forces, which may affect the wind-induced response significantly [5,6].…”