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Q 28. How much safety is built into design of my tower?

Ans : Different suppliers of towers adopt different design philosophies. In LRFD method of design the material is subjected to 100% yield stress. The multiplying safety factors for load and resistance are to be decided by the designer. In working stress method, the permissible stress is provided by code itself. It is possible in LRFD method to adopt a lower multiplying factor and arrive at a light weight tower. Working stress method (IS 800) on other hand does not leave that option open and normally results in heavier and safer tower. We at POLY-QUAL always opt for IS 875/IS 800 codes i.e. more structural safety, capacity and integrity.