Free Vibration of Light Roofs Backed by Cavities

Novák, Miloš; Kassem, Magdy

doi:10.1061/(asce)0733-9399(1990)116:3(549)

Cited by 10 publications

(3 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Daw and Davenport (1989) tested a forced fl exible semicylindrical shell model in a wind tunnel and concluded that the aerodynamic coeffi cients are dependent upon the shape of a structure and are related to amplitude. The free vibration of large-span, self-supported, lightweight roofs backed by cavities with wall openings was experimentally investigated by Novak and Kassem (1990). He researched the infl uence of the wall openings on frequency and the total damping of the structure and compared it with a theory they proposed.…”

Section: Introductionmentioning

confidence: 98%

Experimental study on interaction between membrane structures and wind environment

Yang

Wei

2010

Earthq. Eng. Eng. Vib.

View full text Add to dashboard Cite

The interaction between membrane structures and their environment can be either static or dynamic. Static interaction refers to interaction with static air, while dynamic interaction refers to wind and its effects. They can be evaluated by two parameters, added mass and radiation /aerodynamic damping, which are experimentally investigated in this study. The study includes the effects of both the static and dynamic interaction on structural dynamic characteristics, and the relationship between the interaction parameters and the covered area of a membrane structure for the static interaction and the relationship between the interaction parameters and wind direction and speed for the dynamic interaction. Experimental data show that the dynamic interaction is strongly correlated with the structural modes, i.e., the interaction of the symmetric modes is much larger than the anti-symmetric modes; and the infl uence of the dynamic interaction is signifi cant in wind-induced response analysis and cannot be ignored. In addition, it is concluded that the structural natural frequency is remarkably decreased by this interaction, and the frequency band is signifi cantly broadened.

show abstract

Section: Introductionmentioning

confidence: 98%

Experimental study on interaction between membrane structures and wind environment

Yang

Wei

2010

Earthq. Eng. Eng. Vib.

View full text Add to dashboard Cite

show abstract

“…These types of roofs are well-performing in high seismic hazard areas because their mass is very low and fundamental periods very high. On the other hand, due to their lightness, they are sensitive to wind and snow actions [12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Pressure modes for hyperbolic paraboloid roofs

Rizzo¹,

Demartino

2020

Curved and Layered Structures

View full text Add to dashboard Cite

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.

show abstract

“…Novak and Kassem [58] experimentally studied the free vibration of light-weight, selfsupported large-span roofs supported by cavities with wall openings. The study investigated the wall openings influence on the frequency and the total structural damping and then compared it with a theory that they proposed.…”

Section: Fluid-membrane Structure Interactionmentioning

confidence: 99%

Numerical Simulation of Selected Two-Dimensional and Three-Dimensional Fluid-Structure Interaction Problems Using OpenFOAM Technology

Al-Manthari¹

View full text Add to dashboard Cite

Fluid-structure interaction (FSI) problems are increasing in various engineering fields. In this thesis, different cases of FSI in two-and three-dimensions (2D and 3D) are simulated using OpenFOAM and foam-extend. These packages have been used to create a coupling between fluid and solid.The vortex-induced vibration (VIV) phenomenon of flow past a circular cylinder is studied using PIMPLE algorithm for pressure-velocity coupling. This VIV study is restricted to incompressible flow simulation at a Reynolds number (Re) of 100. The changes of drag and lift coefficient values depend on the study case and the spring-massdamper system for the flow past a free oscillatory cylinder. The free vibrating cylinder examined in one-degree-of-freedom (1DOF) and two-degrees-of-freedom (2DOF) systems with linear damping and spring properties. Both will affect the behaviour of the cylinder within the flow with some noticeable differences. The response time of the cylinder and the drag coefficient are the most affected by the spring and damper.

show abstract

Free Vibration of Light Roofs Backed by Cavities

Cited by 10 publications

References 3 publications

Experimental study on interaction between membrane structures and wind environment

Experimental study on interaction between membrane structures and wind environment

Pressure modes for hyperbolic paraboloid roofs

Numerical Simulation of Selected Two-Dimensional and Three-Dimensional Fluid-Structure Interaction Problems Using OpenFOAM Technology

Contact Info

Product

Resources

About