Influence of predicted creep coefficients on the creep buckling of shallow spherical concrete domes

Authors: E.H. Hamed, M.A. Bradford, R.I. Gilbert, R.E. Erkmen
Paper category: conference
Book title: Concrete Durability and Service Life Planning – ConcreteLife’09
Editor(s): K. Kovler
Print ISBN: 978-2-35158-074-5
e-ISBN: 978-2-35158-085-1
Publisher: RILEM Publications SARL
Publication year: 2009
Pages: 375 – 382
Total Pages: 8
Language: English

Abstract: The influence of uncertainties regarding the evaluation of the creep coefficient on the service life and the nonlinear long-term buckling behaviour of shallow concrete domes is investigated. Concrete domes find widespread use in many engineering fields, while a thorough understanding of their nonlinear time-dependent behaviour, and the development of comprehensive analytical models for their analysis, has hitherto not been fully established. A nonlinear theoretical model, which accounts for the effects of creep and shrinkage, and which considers the ageing of the concrete material and the variation of the internal stresses and geometry in time, is used for this study. The model is based on equilibrium requirements and on integral-type constitutive relations. A step-by-step procedure is used for the solution of the integral governing equations in time. A parametric study, which examines the influence of different parameters that control the magnitude and time variation of the creep coefficient on the creep buckling behaviour of domes, is provided. These parameters are much affected by environmental effects of moisture, humidity, and temperature. The results show that longterm effects are critical for the design, service life, and structural safety of shallow concrete domes, and that regular uncertainties in the evaluation of the creep coefficient have a significant effect on the structural response, and on shortening the design life.

Online publication: 2012-05-16
Publication Type: full_text
Public price (Euros): 0.00