Alessandro Serafini (Waseda University, Japan), authors, publisher and date (possibly 2009) not given in the pdf file), see http://www.scribd.com/doc/207835140/Buckling-Free-Pipe-External-Pressure#scribd
“Chapter 2 Buckling of free pipe under external pressure”
ABSTRACT: In separated-type water tunnel structure, when the point supported steel liner is subjected to the uniform external pressure, the contact between tunnel lining and liner is difficult to happen because the developed compressive hoop thrust in pipe only shortens the circumference of liner and then enlarges the gap between liner and host. Therefore, the buckling of the uniformly point supported liner can be considered a rotary symmetric buckling likely the buckling of free pipe under external pressure. In this chapter, the buckling of free pipe is investigated.
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