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Journal ArticleDOI

Buckling analysis of cooling tower shells subjected to non-axisymmetric wind pressures

TL;DR: In this paper, a rigorous bifurcation analysis of a cooling tower shell subjected to actual non-axisymmetric wind pressure distribution using quadrilateral or triangular elements is presented.
About: This article is published in Computers & Structures.The article was published on 1991-01-01. It has received 4 citations till now. The article focuses on the topics: Wind engineering & Buckling.
Citations
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Journal ArticleDOI
TL;DR: In this paper, a meta-heuristic search method based on the analogy between the performance process of natural music and searching for solutions to optimization problems was developed for optimum design of steel frames.
Abstract: In this article, harmony search algorithm was developed for optimum design of steel frames. Harmony search is a meta-heuristic search method that has been developed recently. It bases on the analogy between the performance process of natural music and searching for solutions to optimization problems. The objective of the design algorithm is to obtain minimum weight frames by selecting suitable sections from a standard set of steel sections such as American Institute of Steel Construction (AISC) wide-flange (W) shapes. Strength constraints of AISC load and resistance factor design specification and displacement constraints were imposed on frames. The effectiveness and robustness of harmony search algorithm, in comparison with genetic algorithm and ant colony optimization-based methods, were verified using three steel frames. The comparisons showed that the harmony search algorithm yielded lighter designs.

230 citations

Journal ArticleDOI
TL;DR: A brief overview of the status of finite element methods in wind engineering can be found in this article, where technologies necessary for the development of general fluid-structure interaction capabilities in wind energy are identified.

10 citations

Journal ArticleDOI
TL;DR: In this paper, the stability analysis of a cooling tower shell subjected to nonaxisymmetric wind pressure has been carried out using finite ring elements and the concept of a local enhancement of wind pressure coefficients at the top was introduced.
Abstract: The stability analysis of natural draught cooling tower shell subjected to nonaxisymmetric wind pressure has been carried out using finite ring elements. In this investigation, concept of a local enhancement of wind pressure coefficients at the top—in addition to the usual variation of wind pressures with height—has been newly introduced. Justification for the use of such modified wind pressure coefficients has been presented. By considering the modified distribution of wind pressure coefficients, a parametric study has also been carried out to assess the influence of top ring stiffener, gradual thickening at shell bottom edge, and vertical cracking due to thermal gradient on the buckling behavior of natural draught cooling tower shells. Guidelines are furnished for choosing dimensions of the top ring stiffener to avoid top edge buckling.

4 citations

01 Jan 2013
TL;DR: A traves de un analisis estructural and vibracional se han hallado las causas que han originado las lesiones in el sistema examinado as mentioned in this paper, en el presente articulo se resume el estudio realizado sobre la torre de refrigeracion of una central termoelectrica a raiz de fisuras halladas tras una inspeccion de mantenimiento.
Abstract: Resumen — En el presente articulo se resume el estudio realizado sobre la torre de refrigeracion de una central termoelectrica a raiz de fisuras halladas tras una inspeccion de mantenimiento. A traves de un analisis estructural y vibracional se han hallado las causas que han originado las lesiones en el sistema examinado. El estudio se ha llevado a cabo mediante un modelo de elementos finitos, alimentado con datos medidos de forma experimental, que permite calcular los modos propios de vibracion y estimar la influencia de parametros externos como el impacto del viento. Mediante el trabajo realizado se han disenado metodologias de reparacion destinadas al correcto funcionamiento de la torre de refrigeracion. Palabras clave— Analisis estructural y vibracional, impacto del viento, modelo de elementos finitos, modos propios de vibracion.
References
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Book
01 Jan 1971
TL;DR: In this paper, the authors describe how people search numerous times for their favorite books like this the finite element method in engineering science, but end up in malicious downloads, and instead they cope with some infectious bugs inside their computer.
Abstract: Thank you very much for downloading the finite element method in engineering science. Maybe you have knowledge that, people have search numerous times for their favorite books like this the finite element method in engineering science, but end up in malicious downloads. Rather than enjoying a good book with a cup of tea in the afternoon, instead they cope with some infectious bugs inside their computer.

3,688 citations

Journal ArticleDOI
TL;DR: In this paper, a method for the structural analysis of shells of revolution, composed of materials with orthotropic properties, is discussed based on the direct stiffness method and a truncated cone element is introduced to take advantage of symmetry.
Abstract: A method for the structural analysis of shells of revolution, composed of materials with orthotropic properties, is discussed. The development is based on the direct stiffness method. A truncated cone element is introduced to take advantage of symmetry. Derivations of the stiffness and stress matrices for the truncated cone element are given. Several examples are solved on the digital computing machine using a program that is based on the truncated cone element. The results are compared to other theoretical results, and the correlation is excellent. Extension of the technique to handle linear unsymmetric deformation and nonlinear symmetric deformation is discussed.

140 citations

Journal ArticleDOI
TL;DR: In this paper, it was shown that a typical cooling tower made of reinforced concrete would not buckle under wind load, at least not in the classical sense of the word, because failure would rather be initiated by rapid propagation of cracks in tensile zones followed by temporary stiffening and finally by yielding of the reinforcement.

66 citations

Journal ArticleDOI
TL;DR: An extension of the finite-element displacement method to the analysis of linear bifurcation buckling of general shells of revolution under static axisymmetric loading is presented in this article, where the shell is discretized into either a series of conical frusta or of frusta with meridional curvature.
Abstract: An extension of the finite-element displacement method to the analysis of linear bifurcation buckling of general shells of revolution under static axisymmetric loading is presented. A systematic procedure for the formulation of the problem is based upon the criterion that the condition for neutral stability of a system is the vanishing of the second variation of the total potential energy from the stable equilibrium state to the perturbed bifurcation state; this results in an eigenvalue problem. For solution, the shell is discretized into either a series of conical frusta or of frusta with meridional curvature. The prebuckling equilibrium solution is axisymmetric, but the perturbation-displacement field within each element is represented by Fourier circumferential components of the generalized displacements which are defined at the nodal circles. The present formulation is applied to a number of shells of revolution with arid without meridional curvature, and comparisons are made with other theoretical and available experimental results.

34 citations

Journal ArticleDOI
01 Sep 1968

33 citations