Faculty of Engineering

Permanent URI for this communityhttps://repository.nileuniversity.edu.ng/handle/123456789/14

Browse

End date: 2019Subject: search.filters.subject.Collapsed building

Search Results

Now showing 1 - 3 of 3
  • No Thumbnail Available
    Item
    Evaluation of the Mechanical Properties of Reinforcing Steel Bars from Collapsed Building Sites
    (ASM, 2013-08-27) Jamiu Kolawole Odusote; Adekunle Akanni Adeleke
    Mechanical properties of reinforcing steel bars obtained from three different collapsed building sites in Lagos, Nigeria were examined. An optical emission spectrometer was used for chemical composition analysis while the tensile test was carried out using a Universal Testing Machine. The yield strength of the steel bars was found to be higher than BS4449 (GRADE 460B), Nst.65-Mn, and ASTM A706 standards, while their percentage elongations were lower than most of the standards. The steel bars used at the Sango collapse site have higher UTS compared with the standards, while those used at Ilesanmi and Ewuntun collapse sites have UTS values that are in close range with the standards. The reinforcing bar obtained from Ilesanmi collapsed site has higher percentage elongation than ASTM A706 standard but lower than Nst.65-Mn and BS4449 (GRADE 460B) standards. The bars obtained from Sango and Ewuntun collapse sites displayed lower percentage elongation compared with that from Ilesanmi site. All the investigated reinforcing bars possessed reasonably high strength with low ductility. Thus, these bars are susceptible to brittle fracture, which might have contributed to the collapse of the building structures.
  • No Thumbnail Available
    Item
    Microstructural assessment of AISI 1021 steel under rapid cyclic heat treatment process
    (Elsevier, 2019-10-13) Adekunle Akanni Adeleke; Peter Pelumi Ikubanni; T. A. Orhadahwe; J.O. Aweda; Jamiu Kolawole Odusote; O.O. Agboola
    This research was aimed at using image analysis to describe the effects of rapid cyclic heating on mild steel. AISI 1021 steel sample used in this study was subjected to quenching heat treatment followed by 1, 2, 3, and 4-cycles of rapid heat treatment. The as-treated steel samples were characterized by Brinell hardness tests, Charpy V-notch impact tests, optical microscopy, and image analysis using Image J software. The results revealed that the grain size decreased from 1.07 μm in the control sample to 0.79 μm in the third cycle sample and increased to 0.86 μm in the fourth cycle sample. However, the results revealed that two-cycles of rapid heat treatment was enough to produce ultra-fine grains and impact ductility in mild carbon steel. Keywords: Mechanical properties, Collapsed building, Steel rods, Chemical compositions, Percentage elongation
  • No Thumbnail Available
    Item
    Dataset on the evaluation of chemical and mechanical properties of steel rods from local steel plants and collapsed building sites
    (Elsevier, 2018-11-02) Adekunle Akanni Adeleke; J.K. Odusote; Peter Pelumi Ikubanni; O.A. Lasode; O.O. Agboola; A. Ammasi; K.R. Ajao
    The quality of steel rods used in structural applications has been subjected to continuous scrutiny by researchers in Nigeria. In this data article, the experimental data on the chemical and mechanical properties of steel rods from collapsed building sites and local steel plants have been reported. The chemical composition consisting of carbon, manganese, silicon, sulphur, phosphorus among other elements were recorded using an optical emission spectrometer. Some of the main elements were used to evaluate the carbon equivalent value and the results are reported in this article. The yield strength, ultimate tensile strength and percentage elongation were also presented as obtained from the universal testing machine. The hardness values of the steel rod samples were also presented