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Vol. 43 (2002) No. 3 December n. 140

Non-Linear Earthquake Analysis for RC Natural Draught Cooling Towers

< Table of Contents for Vol. 43 (2002) No. 3 December n. 140
  • Journal Name: Journal of the International Association for Shell and Spatial Structures (J. IASS)
  • ISSN: (Electronic Version) 1996-9015
  • ISSN: (Print Version) 1028-365X
  • Issue: Vol. 43 (2002) No. 3 December n. 140
  • Pages: 143-158
  • Title: Non-Linear Earthquake Analysis for RC Natural Draught Cooling Towers
  • Author(s): C. Lang and U. Wittek
  • Keywords: Non-linear Dynamics, Finite Ring Elements, Earthquake Analysis, RC Cooling Tower Shells.
In this paper, the structural behaviour of a modern natural draught cooling tower under horizontal seismic ground accelerations is simulated using a special FE-method with ring elements. The results obtained from diferent analysis methods – equivalent static acceleration method, response spectrum method and linear and non-linear dynamic analyses in the time domain by modal analysis and direct integration – are compared with each other and statements concerning their validity of application are discussed. Further, non-linear dynamic effects arising from uplift, cracking of the shell and cracking of the supporting truss columns are accounted for and the results are compared to the linear solution. Special attention is paid to the effects and the consequences of the non-linear structural behaviour on the stress resultants and on the corresponding required reinforcement amounts for the shell and to the consequences on the axial forces in the supporting trusses. For this end, special numerical tools (elements and solution algorithms) had to be developed. Particularly, the formulation of shell ring elements which are very efficient for this special task had to be enhanced to non-linear problems. The ne-cessary derivations and enhancements of elements and algorithms will be briefly presented and summarised in this contribution.

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