Safety of Early Age Loaded Reinforced Concrete Members

Authors

  • Jibrin Mohammed Kaura Department of Civil Engineering, Ahmadu Bello University, Zaria
  • Adamu Lawan Ibrahim Aliyu
  • Mohammed Sulaiman Mahmood

Keywords:

Construction load, reliability, slab

Abstract

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  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

Author Biography

Jibrin Mohammed Kaura, Department of Civil Engineering, Ahmadu Bello University, Zaria

Department of Civil Engineering, Lecturer I

References

Abubakar, I. “Reliability 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. “Probability Concepts in Engineering Planning and Design†Volume 1 – Basic principles. John Wiley and Sons, New York, 1975.

Ditlevsen O. “Uncertainty Modelling with Application to Multidimensional Civil Engineering Systemsâ€. McGraw-New York, 1981

Ditlevsen O. and Madsen H. O. “Structural Reliability Methods.†John Wiley & Sons, Chichester, 2005

Ditlevsen, O. Der Kiureghian, A. “ Aleatory or epistemic? Does it matter?†Journal of Structural safety, 31: 105-112, 2009

Dimitri, V. V. and Mark, G. S. “Safety factors assessment of existing structuresâ€. Journal of Structural Engineering. Vol 128 (2) pp 258-265, 2002

Eurocode 1990 “Eurocode-Basis of structural designâ€. British standards. CEN Brussels , 2002

Eurocode 2 “Eurocode 1992 1-1: Design of Reinforced Concrete structures, part 1-1, General Rules and Rules foe Buildings†CEN, Brussels, 2008

Gollwitzer S, Abdo T., and Rackwitz R. “First Order Reliability Method: FORM Softwareâ€. User Manual.Munich, 1988

Hakan, F. L. “ 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. “Case Histories of Building Collapse in Nigeria†Proceedings on National Technical Workshop on Building Collapse in Nigeria, pp 55-77, 2012

JCSS “Probabilistic 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. “Structural reliability analysis and predictionâ€. Chichester, John Wiley, 1999

MacGregor, J.G. “Safety 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. “Structural 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), “Early-age loading and long term deflection of reinforced concrete beams. Structural Journal. Vol 93 (7), 2002

Downloads

Published

2014-03-01

How to Cite

Kaura, J. M., Aliyu, A. L. I., & Mahmood, M. S. (2014). Safety of Early Age Loaded Reinforced Concrete Members. Asian Journal of Engineering and Technology, 2(1). Retrieved from https://ajouronline.com/index.php/AJET/article/view/972