Effect of Wind Speed on Frangible Towers
A tall tower
tends to act as an energy storage device under the action of wind thereby
letting the fluctuating wind forces cause the tower to move. This further makes
the motions gradually build up for exchanging kinetic energy and stored elastic
energy by swaying to and fro causing the pendulum effect. It generates potential fatigue
damage and possibly collapses. The limit on these motions is set by the
ability of the tower to dissipate energy faster than the rate at which the wind
feeds energy in, through its damping ratio.
As a matter of fact
- The higher the damping ratio, the better it
will be thereby making the wind load acts only on the center of each region.
- A support structure must also be very stable considering
- Break-away or failure mechanisms are
independent of the strength required and must not be prone to premature fatigue
- Safety masts must be able to withstand wind
load in normal conditions at maximum wind speeds of up to 40 m/s thereby
- Verify the stability of an approach lighting
system for a range of different mast heights.
- No permanent deformation of the structure
should be allowed after the wind load.
- Any design using frangible mechanisms has to
ensure that no change in shape or slippage occurs from cyclic loading.
- Stipulate the allowed deflection of approach
lights as ±2° in the vertical axis and ±5° in the horizontal axis as per ICAO
and the FAA
All these desired essentials have been taken
as an opportunity by SGS Frangible Towers to start the design process with a
high level of total damping and thus we fulfill
these expectations with the help of frangibility induced innovative solutions that
• Materials and configurations for frangible structures
are suitable for the intended use
• To meet frangibility requirements, the materials
selected have a low modulus of toughness and are strong and lightweight
• Manufacturing of the lightest structure practicable
with assigning the mass to the joint; the link element, hinge at the center and
angle of the tower
• Minimum weight to ensure the least amount of energy
expended to accelerate the mass to the speed of the impacting aircraft.
• Structures are fabricated from materials that are not
adversely affected by outdoor environmental conditions.
• All materials withstand or be protected against
• corrosion (due to ice, sand, rain, snow, grit, etc.)
• weathering (salt spray, relative humidity, wind,)
• solar radiation
• other encountered in the airfield environment
· Conclusion – SGS Frangible Towers
and knowledge always lead to better and best results so we started the design
process with a deep insight into the environment and field which not only helps
us in taking accurate assumptions but also in perfect installation and
performance of our frangible structures especially towers. Ultimately, we offer
desired stability; safety, strength, and frangibility to the towers for better
airport operations and requirements and efficiently rises as a leading and
innovative frangible structure designer and manufacturer globally and in India.