Safety of Early Age Loaded Reinforced Concrete Members
Keywords:Construction load, reliability, slab
This paper examines the effect of construction loads on the safety of reinforced concrete members. A simply supported reinforced concrete slab was considered for the investigation. The probabilistic analysis of time dependent characteristic concrete strength takes into account the slab capacity from casting to maturation. The variation of load was accommodated though a load ratio (dead to live). Adequate review was made on structural reliability analysis using first order reliability method. The focus of the paper was on evaluating the effect of early age loads on the reliability of reinforced concrete members, in which the uncertainties associated with the basic design variables were fully accommodated. First Order Reliability Method was employed though a developed computer program in FORTRAN 77 to accomplish the reliability analysis. It was clearly established that concrete structural members under construction loads has limiting capacity Â prior to twenty eighth days after casting, and may lead to dramatic lost of stability of the whole system, if shoring and formwork are removed
Abubakar, I. â€œReliability analysis of structural design parameters of strip footingsâ€. Journal of Applied Sciences and Research. 2(7) pp 497-401, 2006
Afolayan J. O. "Reliability-Based Analysis and Design", Departmental Seminar, Department of Civil Engineering, Ahmadu Bello University Zaria, 1992
Ang, H. S. and Tang, W.H. â€œProbability Concepts in Engineering Planning and Designâ€ Volume 1 â€“ Basic principles. John Wiley and Sons, New York, 1975.
Ditlevsen O. â€œUncertainty Modelling with Application to Multidimensional Civil Engineering Systemsâ€. McGraw-New York, 1981
Ditlevsen O. and Madsen H. O. â€œStructural Reliability Methods.â€ John Wiley & Sons, Chichester, 2005
Ditlevsen, O. Der Kiureghian, A. â€œ Aleatory or epistemic? Does it matter?â€ Journal of Structural safety, 31: 105-112, 2009
Dimitri, V. V. and Mark, G. S. â€œSafety factors assessment of existing structuresâ€. Journal of Structural Engineering. Vol 128 (2) pp 258-265, 2002
Eurocode 1990 â€œEurocode-Basis of structural designâ€. British standards. CEN Brussels , 2002
Eurocode 2 â€œEurocode 1992 1-1: Design of Reinforced Concrete structures, part 1-1, General Rules and Rules foe Buildingsâ€ CEN, Brussels, 2008
Gollwitzer S, Abdo T., and Rackwitz R. â€œFirst Order Reliability Method: FORM Softwareâ€. User Manual.Munich, 1988
Hakan, F. L. â€œ Uncertainty and Risk Analysis in Fire Safety Engineeringâ€. Lund University Institute of Technology. Department of Fire Safety Engineering. Report LUTVDG (TVBB-1016), 1998
Ike A. C. â€œCase Histories of Building Collapse in Nigeriaâ€ Proceedings on National Technical Workshop on Building Collapse in Nigeria, pp 55-77, 2012
JCSS â€œProbabilistic Model Code: Part 1- Basis on designâ€. Joint Committee on Structural Safety. 12th draft, internet version: http://www.jcss.ethz.ch, 2000
Melchers, R. E. â€œStructural reliability analysis and predictionâ€. Chichester, John Wiley, 1999
MacGregor, J.G. â€œSafety and limit state design for reinforced concreteâ€, Can. J., Civ,. Engg. Vol 3 (40) pp 484-513, 1976
Rao, K. D. Kushwaha, H. S. Verma, A. K. and Srividya, A. Quantification of Epistemic and aleatoru uncertainties in Level-1 probabilisric safety assessment tudies. Reliability Engineering and System Safety vovol 92 pp 947-956, 2007.
Rosowsky D. V., Steward M. G. and Epaarachchi D. C. â€œStructural Reliability of Multistorey Buildings Duing Constructionâ€, Jnl of Struct. Engrg, Vol. 128, Issue 2, pp. 205-213, 2002
Rosowsky D. V., Steward M. G. and Khor, E. H. (2002), â€œEarly-age loading and long term deflection of reinforced concrete beams. Structural Journal. Vol 93 (7), 2002
How to Cite
- Papers must be submitted on the understanding that they have not been published elsewhere (except in the form of an abstract or as part of a published lecture, review, or thesis) and are not currently under consideration by another journal published by any other publisher.
- It is also the authors responsibility to ensure that the articles emanating from a particular source are submitted with the necessary approval.
- The authors warrant that the paper is original and that he/she is the author of the paper, except for material that is clearly identified as to its original source, with permission notices from the copyright owners where required.
- The authors ensure that all the references carefully and they are accurate in the text as well as in the list of references (and vice versa).
- Authors retain copyright and grant the journal right of first publication with the work simultaneously licensed under a Attribution-NonCommercial 4.0 International that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this journal.
- Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal's published version of the work (e.g., post it to an institutional repository or publish it in a book), with an acknowledgement of its initial publication in this journal.
- Authors are permitted and encouraged to post their work online (e.g., in institutional repositories or on their website) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (See The Effect of Open Access).
- The journal/publisher is not responsible for subsequent uses of the work. It is the author's responsibility to bring an infringement action if so desired by the author.