Interference effects from adjacent structures on wind-induced forces in large billboards | |
| Author | Kobchai Poemsantitham |
| Call Number | AIT Thesis no.ST-05-05 |
| Subject(s) | Billboards--Aerodynamics Wind-pressure |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Engineering and Technology |
| Publisher | Asian Institute of Technology |
| Series Statement | Thesis ; no. ST-05-05 |
| Abstract | Wind-induced force is one of the serious problems for large billboards and may cause the structural failure. The collapse of billboard may result in losses of lives and assets. Therefore, an understanding of wind loads on billboards is necessary for structural design to ensure that the performance of structures will be adequate during their anticipated life from the standpoint of both safety and serviceability. In spite of the fact that many studies relating to wind load on billboards have been made, their findings were concerned only one-panel billboard and without nearby structure. Actually, two-panel billboards have become popular in commercial advertising. Moreover, most of them are placed close to elevated expressway. Consequently, the effect of gap between panels and interference effect from nearby structure must be properly evaluated. Wind tunnel experiments using several rigid models were conducted to determine the wind loads on billboards due to these effects. The representative type of boundary layer between open-terrain and suburban terrain was simulated by using the combination of spires and roughness elements. The High-frequency force balance technique was used for measuring base forces and moments. For the simulation of billboard, several rigid models were made with length scale factor 1:200 corresponding to that of the simulated wind. Four typical billboard models were tested for a range of wind directions to investigate their effects on aerodynamic coefficients, vertical and horizontal eccentricities of wind loads. The measurements indicated that the higher angles between panels, the higher wind load was obtained. Meanwhile, the interference effects from expressway decreased by increasing the distance separation for all configurations and there are no significant effects on wind load. Furthermore, present results showed reasonably good agreement with earlier works. A generalized set of guidelines was proposed according to present results. |
| Year | 2005 |
| Corresponding Series Added Entry | Asian Institute of Technology. Thesis ; no. ST-05-05 |
| Type | Thesis |
| School | School of Engineering and Technology |
| Department | Department of Civil and Infrastucture Engineering (DCIE) |
| Academic Program/FoS | Structural Engineering (STE) /Former Name = Structural Engineering and Construction (ST) |
| Chairperson(s) | Pennung Warnitchai; |
| Examination Committee(s) | Pichai Nimityongskul;Nakhorn Poovarodom; |
| Scholarship Donor(s) | The Royal Thai Government Fellowships; |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 2005 |