Destructive and Non-Destructive Assessment of Collapsed Structures in Onitsha, Anambra State, Nigeria


  • J.N. Udebunu
  • S. M.O Obiorah


Building, Collapse, destructive, strength and testing.


This project work identifies the incessant building failure which has been reported, resulting in the loss of lives and properties in Anambra State Nigeria. A study of some selected collapsed buildings in Onitsha, Anambra state, Nigeria is carried out in this work. The methodology includes conduct of site investigations, and site inspections, destructive testing and non-destructive testing of collapsed structural element to establish their strength by the determination of the yield strength of the reinforcements and sieve analysis of the soil at the site, the use of Schmidt hammer instrument in determining the strength of the concrete. From the results of the test carried out in the case study 1, the column strength ranges from13N/mm2 to 22N/mm2, beam ranges from 13N/mm2 to 21N/mm2 and slab strength ranges from 15.67N/mm2 to 21N/mm2. In the case 2 collapsed building the column strength ranges from 14N/mm2 to 23N/mm2, the beam strength ranges from 15.53N/mm2 to 21N/mm2 and slab from10N/mm2 to 21N/mm2.the reinforcing bars has a strength hardness value of 21.19HRC for EC, 20.22HRC for IC and 19.63HRC for SC. These values are compared with BS4449 and Nst-65-Mn standards and 24N/mm2 concrete strength at maturity in accordance to BS8110. The findings show that improper mix of concrete, the use of substandard materials and poor supervision of work, contributed to the collapse of the building. 

Author Biography




[1]. Adeniya, (2002) Building Maintenance in Nigeria: The Journal of Professional Engineer, Nigeria society of Engineer pp 11-14.
[2]. Ogunsemi, D. R. (2002). Building Collapse: Causes, prevention and remedies, The Nigerian Institute of Building, Ondo. Pgs. 38 and 82.
[3]. (Levy and Salvadori, 2002), citation from the holy bible, Genesis 11:1-9
[4]. Chinwokwu, (2000). The role of professionals in averting building collapse, the Nigerian institute of building publication, may 3rd and 4th, pg 12-27.
[5]. Iyagba, R. O. A. (2005): The menace of sick buildings – a challenge to all for its prevention and treatment. An Inaugural lecture delivered at University of Lagos, Lagos.
[6]. Jack, (2011) as stated in vanguard Newspaper (March 27th 2008) Building Collapsed in Nnewi. Page 46
[7]. Salau, (1996). As recorded by (Abibo 2007), collapse of building in saque, Port Harcourt.
[8]. Ezeagu C.A.(2007) “Probabilistic Risk Analysis and Checks of Incessant Collapse of Structures in Nigeria”. A paper presented at the Nigerian Institution of Structural Engineers Annual conference at Airport Hotels Ikeja Lagos. Oct. pp 39-47.
[9]. Arayela, O. & Adam, J.J. (2001). Building Disasters and Failure in Nigeria: Causes and Remedies. Association of Engineer Educators (AENGES) Journal, 2(6).
[10]. Fadamiro, J.A. (2002) an assessment of Building regulations and standards and the implications for building collapse in Nigeria, in ed. Ogunsemi D.R. Building Collapse: Causes, Prevention and Remedies. Workshop Nigerian Institute of Building.
[11].Oloyede, S.A., Omoogun, C.B. and Akinjare, O.A. (2010) “ Tackling Causes of Frequent Building Collapse in Nigeria” Journal of Sustainable Development, Vol. 3, No. 3, pp. 127-132.
[12]. Akeju, T.A. (2004): “Lessons from recent structural failures”. The Journal of Nigerian Engineer. 2004. Vol. 19. No.2
[13] .Olateju, B. O. (1991): Effective Contract Management in the Construction Industry.
[14]. Aniekwu, N. and Orie, O.U. (2005): The Determination of Severity Indices of Variable’s that Cause Collapse of Engineering Facilities in Nigeria. A Case Study of Benin City. The Journal of Engineering Science and Application (JESA) Vol.4, No. 2. Pp. 63 -70.




How to Cite

Ezeagu, C. A., Udebunu, J., & Obiorah, S. M. (2015). Destructive and Non-Destructive Assessment of Collapsed Structures in Onitsha, Anambra State, Nigeria. American Scientific Research Journal for Engineering, Technology, and Sciences, 12(1), 170–186. Retrieved from