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Posted: Fri Oct 23, 2020 10:23 am Post subject: self supporting steel pipe carrying bridges
I am in the process designing a self supporting steel pipe bridge which carries water at atmospheric pressure. The span of the bridge is 20 metres & diameter is 2.6 m. As we know ,The pipe will be subjected to longitudinal tensile stresses at bottom & compressive stress at top. The local buckling has to be prevented. What is the limiting b/t ratio for such pipes? IS 800 for semi compact sections gives b/t of 146 which gives a thickness of 17 mm I tried with IS 6533 - section 2 - 1989 steel chimney code. This code specifies the minimum thickness based on diameter D/500 only . Also, it gives a table of allowable stresses to prevent bucking. Can we use this table for design of pipes as both the chimneys & pipes are subjected to predominant bending moments. M.durai
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