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A RELIABILITY STUDY ON A SYMMETRIC TWO-SPAN I - STEEL BEAM

Temple Nwofor

Abstract


In this paper, a reliability study is carried out on a symmetric two-span I-Section steel beam using the First Order Reliability approach. The ultimate limit state of bending moment, shear stress and local buckling of web were the design criteria considered in the reliability index estimation. A Matlab code was developed based on the performance functions developed for the various failure modes and a Matlab optimizer, fmincon, was invoked in the reliability estimation. It was shown that the reliability indices decreased with increase in span of the beam and also decreased with increase in the load ratio. Also, increasing the beam span beyond 800 cm may jeopardize the safety of the beam for both the bending and shear failure modes. It was also found that the reliability indices decreased with increase in design strength for the web buckling mode. It was also found that the bending moment failure mode appeared to be more critical, followed by the shear stress failure mode and then the web buckling failure mode.


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References


BS 5950, (1990). “Structural use of steelwork, part 1”. The majesty’s stationery office, London.

Abubakar, I. (1996). “Reliability analysis of structural design parameters of strip footing”. Journal of Applied Science and Research, Vol. 2, No. 7, pp.397-401.

Afolayan J.O. (2004). “Cost-effectiveness of vibration criteria for wooden floors”. Asian Journal of Civil engineering (Building and Housing), Vol. 5, No. 1-2, pp.57-67.

Afolayan J.O. (2005). Probability based design of glued thin-webbed timber beams. Asian Journal of Civil Engineering (Building and Housing) Vol.6, Nos. 1-2, Pp 75-84.

Benu, M.J. and Sule, S. (2012). “Probabilistic failure analysis of a solid timber column”. Nigerian Journal of Technology, Vol. 31, No. 3, pp.405-408.

Karthik, C.B., Amit, K.O., Manjuprasad, M., and Dinesh, S.V. (2017). “Reliability analysis of frames”. International Journal of Engineering Research in Mechanical and civil Engineering,

Vol.2, Issue 9, pp 23 – 27.

Magaji, S. and Abubakar, I. (2017). “ Reliability-based evaluation of bending moment magnifiers for the design og reinforced concrete short columns under biaxial bending”. SSRG International Journal of civil engineering (SSRG – IJCE), Vol. 4, Issue 4, pp. 56 - 63.

Melchers, R. (1999). “Structural reliability analysis and prediction”. Second Edition, Chisester, John Wiley and Sons.

Mosley, W.H. and Bungey, J.H. (1990). “Renforced concrete design”. Macmillian Hampshire.

Nowak S.A., Colins, R.K. (1976). “Reliability of structures”. Thomas Casson, University of Michigan.

Obot, I.D. and Archibong, A.E. (2016). “Collapsed buildings in Nigeria”. Global Journal of Engineering Research, Vol. 15, pp. 11-15.

Ranganathan R. (1990). “Structural reliability analysis and design”. Jaico Publishing House, Mumbai.

Sule, S. (2011). “Probabilistic approach to structural appraisal of a building during construction”. Nigerian Journal of Technology, Vol. 30, No. 2, pp.149-153.

Sule, S. (2013). “A new approach to structural appraisal of a building during construction”. Journal of Engineering Research, Vol. 18, No. 1, pp.14-20.

Sule, S. and Eme D.B. (2014). “Generalized stochastic models for building performance evaluation in Nigeria”. IOSR Journal of Engineering (IOSRJEN), Vol. 04, Issue 01, pp.01-04.


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