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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 86
PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON CIVIL, STRUCTURAL AND ENVIRONMENTAL ENGINEERING COMPUTING
Edited by: B.H.V. Topping
Paper 219

Numerical Simulation of Fluid-Structure Interaction for Wind-Induced Dynamic Response of a PVC Coated Fabric Sheet on a Renewable Advertisement Billboard

Z.H. Liu12, Q.L. Zhang1 and Y. Zhou2

1Department of Building Engineering, Tongji University, P.R. China
2School of Civil Engineering, Shandong University, P.R. China

Full Bibliographic Reference for this paper
Z.H. Liu, Q.L. Zhang, Y. Zhou, "Numerical Simulation of Fluid-Structure Interaction for Wind-Induced Dynamic Response of a PVC Coated Fabric Sheet on a Renewable Advertisement Billboard", in B.H.V. Topping, (Editor), "Proceedings of the Eleventh International Conference on Civil, Structural and Environmental Engineering Computing", Civil-Comp Press, Stirlingshire, UK, Paper 219, 2007. doi:10.4203/ccp.86.219
Keywords: renewable advertisement billboard, fluid-structure interaction, wind-induced dynamic response, ADINA, pvc coated fabric sheet, wind-induced dynamic coefficient, wind pressure distribution.

Summary
In general, a billboard is more than ten meters above the ground [1,2], it is difficult and dangerous to remove or replace the printing on the billboard. In this paper, a renewable advertisement billboard (RAB) being composed of the steel frame, the rollers, the fixers and the PVC coated fabric sheets (membrane) is presented. On the top and bottom of RAB there are two steel rollers whose axes are fixed at the webs of the columns. Two membrane sheets can be motioned around the rollers so the printing on them can be replaced very easily.

The main objective of this study is to explore an effective and reliable approach for evaluation of wind effects on the renewable advertisement billboard considering fluid-structure interaction (FSI) using ADINA. The steel structures for advertisement billboards are remarkably flexible, low in damping, and light in weight, which exhibits an increased susceptibility to the action of wind. When structures are immersed in the wind flow, the structure moves or deforms appreciably under the wind-induced forces. These deflections, changing as they do, the boundary conditions of the flow, will affect the wind flow forces which in turn will influence the deflections, which is a FSI phenomenon wherein aerodynamic forces and structural motions interact significantly.

The fluid is modeled using the viscous and incompressible Navier-Sokes equations with (k-epsilon) turbulence model. The flow domain is discretized by an eight node hexahedron FCBI-C [3] fluid element. The structure model's material is an isotropic-elastic membrane whose elastic modulus and Poisson's ratio are 8*108N/m2 and 0.3 respectively. The thickness of the membrane is 1mm. In the finite element model, the structure domain is discretized by a 3D-Solid plane stress element [4] whose initial stress is 3*106N/m2.

The results revealed the velocity in the flow domain. The typical features of the structure such as displacements and velocity were also observed. Furthermore, the node displacement wind-induced dynamic coefficients were investigated. Finally, the wind pressure distribution coefficient [5] was studied. In this paper, the wind-induced dynamic coefficients were advised to be 1.7 on both windward and leeward of the advertisement billboards.

References
1
Technical specification for membrane structures (CECS158:2004). Beijing: China Planning Press, 2004.
2
Load Code for Building Structures (GB50009-2001). Beijing: Construction Industry Press of China, 2002.
3
ADINA Theory and Modeling Guide Volume III: ADINA-F,Report ARD 04-09, 2004.
4
ADINA Theory and Modeling Guide Volume I: ADINA-A,Report ARD 04-09, 2004.
5
Xinli Chen, Shizhao Shen, Yang Xiang, "Wind-inducing Response Analysis and The Coefficient for Wind-Resistant Design of The Saddle-Shaped Membrane Structures", Journal of Tianjin Institute of Urban Construction, 7(3):159-163, 2001.

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