Parametric Analysis of Natural Draft Hyperbolic Cooling Tower under Seismic Load
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Date
2019-07
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Addis Ababa University
Abstract
Hyperbolic cooling towers are large, thin shell reinforced concrete structures which
contribute to environmental protection and to power generation efficiency and reliability.
They may be subjected to a variety of loading conditions such as self-weight, wind,
earthquake, temperature and construction loads, among others.
In this study, the dynamic behavior of hyperbolic cooling towers with various geometric
properties under earthquake effect is examined. Geometrical parameter ratios of the
cooling tower’s dimensions are considered in order to cover a wider spectrum of the
cooling tower’s geometry. Various cooling tower samples with different geometric
dimensions are analyzed and the effects of curvature, slenderness, thickness and throat
level on the dynamic behavior of hyperbolic cooling towers are investigated. The
influences of these parameters on the behavior of cooling tower are investigated by
comparing lateral displacement, hoop force, meridional forces and moments. Numerical
analysis are performed using a SAP2000 structural analysis software package.
Finally, the hyperbolic cooling tower lateral displacement, force and moment changes due
to the effect of geometric parameters are presented graphically and discussed in detail. The
findings can be used as a basis for further research and establishment of conceptual design
guidelines when considering seismic load on the dynamic behavior of cooling tower.
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Keywords
Hyperbolic cooling tower, Dynamic analysis, Earthquake