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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 48
INNOVATION IN CIVIL AND STRUCTURAL ENGINEERING
Edited by: B.H.V. Topping and M.B. Leeming
Paper IV.9

Creep Induced Moment Redistribution in Reinforced Concrete Structures

F.A. Ali* and P.J.B. Morrell#

*School of the Built Environment, University of Ulster, Jordanstown, United Kingdom
#School of Engineering, University of Sussex, Brighton, United Kingdom

Full Bibliographic Reference for this paper
F.A. Ali, P.J.B. Morrell, "Creep Induced Moment Redistribution in Reinforced Concrete Structures", in B.H.V. Topping, M.B. Leeming, (Editors), "Innovation in Civil and Structural Engineering", Civil-Comp Press, Edinburgh, UK, pp 183-191, 1997. doi:10.4203/ccp.48.4.9
Abstract
This paper presents a simplified method of determining the flexural stiffness of reinforced concrete elements under sustained loads. The equations obtained have then been utilised with the stiffness method to develop a procedure which enables the analysis of statically indeterminate reinforced concrete structures under sustained loads at any time in the loading history. The full solution of such structures requires two iteration types in the analytical procedures. One iteration type to calculate the creep stresses and evaluate the creep induced cracking, and the other iteration calculates the bending moments and the forces in the whole structure. The proposed method eliminates the first iteration type and uses the second type only in which the stiffness matrix of the structure is modified and updated until a reasonable accuracy is achieved. The paper includes an application by presenting an analysis of a reinforced concrete frame under two cases of loading and foundation settlement over 10 years.

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