Wind Design of a Permeable Banner/Signage
Wind Design of a Permeable Banner/Signage
(OP)
Hello,
I am new writing on this forum but I have read many of the problems/questiosn posted by others.
I have been asked to design a 100' long X 45' tall banner that will be attached to a structure on the top and two sides. A wire will run along the bottom to hold the banner in place. I have been told the material that is going to be used is 70% permeable. I would like to know if anyone can point me in the direction of some refernece material can assist me in finding the wind loads, finding the tension in the fabric and the reactions that are imparted on the structure. I would like to consider the stiffness of the cable and the banner material. All help is welcomed even if it describes how to analyze the problem.
I am new writing on this forum but I have read many of the problems/questiosn posted by others.
I have been asked to design a 100' long X 45' tall banner that will be attached to a structure on the top and two sides. A wire will run along the bottom to hold the banner in place. I have been told the material that is going to be used is 70% permeable. I would like to know if anyone can point me in the direction of some refernece material can assist me in finding the wind loads, finding the tension in the fabric and the reactions that are imparted on the structure. I would like to consider the stiffness of the cable and the banner material. All help is welcomed even if it describes how to analyze the problem.






RE: Wind Design of a Permeable Banner/Signage
RE: Wind Design of a Permeable Banner/Signage
Then in point 5.6 went on factors due to the slenderness of the buildings. It was 1 till slenderness 5, 1.25 till slenderness 10, and 1.5 for slendernesses up to 60. May interpolate, said.
Hence by this interpretation of such standard, taking 37.5% of the total area at the total wind forces (pressure plus suction) for an ordinary building at such height should be conservative.
Might be even overly so. Anyway wind wortex shedding -that for a hung banner (standard) would make its supporting cable fling up and down- is unpredictable as wind itself and even such evaluation might turn sometimes unconservative for any kind of wind, pulsed or not, that puts the cable plus banner thing in near resonance.
On the other hand, the waves on the banners of big size may have small wavelengths respect their dimension, this diminishing 1st mode enhancement of the vibration. For most cases, the estimate above should be conservative.
Respect construction ... I think that discrete support of the banner along the cable must be made at small distances, if not continuous. Otherwise it may turn be taking big stresses and ripping off.
RE: Wind Design of a Permeable Banner/Signage
RE: Wind Design of a Permeable Banner/Signage
RE: Wind Design of a Permeable Banner/Signage
When they replace the fabric will the new fabric still be permeable? Probably not.
RE: Wind Design of a Permeable Banner/Signage