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Finite Element Analysis of Hyperbolic Cooling Towers
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.
Postrevolutionary Iran
The 1979 revolution fundamentally altered Iran’s political landscape as a generation of inexperienced clerics who did not hail from the ranks of the upper class—and were not tainted by association with the old regime—came to power. The actions and intentions of these truculent new leaders and their lay allies caused major international concern. Meanwhile, Iran’s domestic and foreign policy and its nuclear program have loomed large in daily news coverage. Despite global consternation, however, our knowledge about Iran’s political elite remains skeletal. Nearly four decades after the clergy became the state elite par excellence, there has been no empirical study of the recruitment, c...
Postrevolutionary Iran
The 1979 revolution fundamentally altered Iran’s political landscape as a generation of inexperienced clerics who did not hail from the ranks of the upper class—and were not tainted by association with the old regime—came to power. The actions and intentions of these truculent new leaders and their lay allies caused major international concern. Meanwhile, Iran’s domestic and foreign policy and its nuclear program have loomed large in daily news coverage. Despite global consternation, however, our knowledge about Iran’s political elite remains skeletal. Nearly four decades after the clergy became the state elite par excellence, there has been no empirical study of the recruitment, c...
