Aerodynamic behaviour of one-way type hanging roofs

Kimoto, Eiji; Kawamura, Sumio

doi:10.1016/0167-6105(83)90159-9

Cited by 20 publications

(2 citation statements)

References 1 publication

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“…They owe their appeal to lightness, cost-effectiveness, and aesthetics. However, different types of tensile roof systems (e.g., cantilevered roofs [5][6][7], grandstand roofs [6][7][8], hanging tensile roofs [9,10], and cable domes of the Geiger type [11]) are exposed to wind loads and therefore can exhibit large aerodynamic response.…”

Section: Introductionmentioning

confidence: 99%

Pressure modes for hyperbolic paraboloid roofs

Rizzo¹,

Demartino

2020

Curved and Layered Structures

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This paper presents a study on Singular Value Decomposition (SVD) of pressure coefficients hyperbolic parabolic roofs. The main goal of this study is to obtain pressure coefficient maps taking into account spatial non-uniform distribution and time-depending fluctuations of the pressure field. To this aim, pressure fields are described through pressure modes estimated by using the SVD technique. Wind tunnel experimental results on eight different geometries of buildings with hyperbolic paraboloid roofs are used to derive these pressure modes. The truncated SVD approach was applied to select a sufficient number of pressure modes necessary to reconstruct the measured signal given an acceptable difference. The truncated pressure modes are fitted through a polynomial surface to obtain a parametric form expressed as a function of the hyperbolic paraboloid roof geometry. The superpositions of pressure (envelopes) for all eight geometry were provided and used to modify mean pressure coefficients, to define design load combinations. Both symmetrical and asymmetrical pressure coefficient modes are used to estimate the wind action and to calculate the vertical displacements of a cable net by FEM analyses. Results clearly indicate that these load combinations allow for capturing large downward and upward displacements not properly predicted using mean experimental pressure coefficients.

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Section: Introductionmentioning

confidence: 99%

Pressure modes for hyperbolic paraboloid roofs

Rizzo¹,

Demartino

2020

Curved and Layered Structures

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“…Kawamura and Kimoto (1979) used modified thin airfoil theory to deduce the aerodynamic stability criteria for one-way tensioned membranes and defined the first two critical velocities as the wind velocity where the total damping was equal to zero and the wind velocity where one mode disappears and another mode appears. They also tested the response of a full-scale one-way tensioned membrane under the action of the wind (Kimoto and Kawamura, 1983) and found that above a certain wind velocity the vibration amplitude of the roof increased rapidly; that wind velocity was called the critical velocity. A similar phenomenon was found by Matsumoto (1990) in his study of tensioned cable roofs in smooth flow; a self-excited oscillation in the first anti-symmetric mode was found at the critical velocity and it was shown to be caused by vortices forming above the roof and shedding downwind at a certain velocity.…”

Section: Introductionmentioning

confidence: 99%

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

Chen²,

Sun

2015

J. Zhejiang Univ. Sci. A

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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.

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Recent advances in the field of long span tension structures

Knudson

1991

Engineering Structures

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Aerodynamic behaviour of one-way type hanging roofs

Cited by 20 publications

References 1 publication

Pressure modes for hyperbolic paraboloid roofs

Pressure modes for hyperbolic paraboloid roofs

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

Recent advances in the field of long span tension structures

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