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self supporting steel pipe carrying bridges

 
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durai_sundaram
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Joined: 07 Apr 2020
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PostPosted: Fri Oct 23, 2020 10:23 am    Post subject: self supporting steel pipe carrying bridges Reply with quote

                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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akhilesh
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Joined: 23 Oct 2020
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PostPosted: Tue Nov 10, 2020 9:47 pm    Post subject: Reply with quote

Eurocode specifies a b/t of 50/70/90 times √235/fy for class 1/2/3 CHS sections- this seems like a more conservative starting point.
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abhio
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Joined: 08 Mar 2010
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PostPosted: Wed Nov 18, 2020 12:06 pm    Post subject: Reply with quote

Dear Er,

The pipe will be carried on saddles in a truss structure, so that the span of the pipe will be of the order of 3m or so.
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