Finite Element Analysis Of Hyperbolic Cooling Towers (lecture Notes In Engineering)
by Seyyed Mohammed Niku /
1986 / English / PDF
3.7 MB Download
The analysis of thin shells of revolution in general has always
occupied an important place in the theory of structures, and
recently the problem of hyperbolic cooling towers has attracted
many investigators due to the wide use of such shells in industry.
Until the early 1960's these towers were of moderate size, probably
not exceeding 76m (250ft) height. In this range, the structural
safety and stability were not of primary concern because, the
minimum wall thickness and reinforcement were sufficient to provide
the required safety. It was not necessary to use very rigorous
methods to analyse the problem. The analysis involved the following
assumptions, i) flexural stresses were ignored (membrane tneory),
ii) The geometry of the shell was assumed to be perfect and to be
idealised as a set of straight sided conical frusta, and iii) The
boundary conditions at the base were taken to be fixed or
continuously hinged with full tangential restraint.
The analysis of thin shells of revolution in general has always
occupied an important place in the theory of structures, and
recently the problem of hyperbolic cooling towers has attracted
many investigators due to the wide use of such shells in industry.
Until the early 1960's these towers were of moderate size, probably
not exceeding 76m (250ft) height. In this range, the structural
safety and stability were not of primary concern because, the
minimum wall thickness and reinforcement were sufficient to provide
the required safety. It was not necessary to use very rigorous
methods to analyse the problem. The analysis involved the following
assumptions, i) flexural stresses were ignored (membrane tneory),
ii) The geometry of the shell was assumed to be perfect and to be
idealised as a set of straight sided conical frusta, and iii) The
boundary conditions at the base were taken to be fixed or
continuously hinged with full tangential restraint.