Reliability-based Assessment of the Structural Integrity of some Existing Reinforced Concrete Columns
Article Sidebar
Main Article Content
Abstract
Abnormal loading can initiate the progressive collapse of a reinforced concrete building. A progressive collapse may start as a local failure, followed by a sequence of reactions leading to a massive portion failure of an entire structure. Reinforced concrete columns are significant structural elements in ascertaining the integrity of framed buildings. This paper presents the report on the structural integrity of reinforced concrete columns of two selected university buildings labelled A and B investigated by using non-destructive testing techniques. First-Order Reliability Method (FORM) was deployed to process the data from the field in order to generate the implied safety indices for all accessed columns in the two buildings. The computed safety indices decrease as the simulated designed practical axial loads/moments increase for all the assumed steel ratios (0.4%, 1.59% and 6%) based on BS 8110:1997:1. When compared with the target safety level of 3.8 according to BS EN 1990:2002+A1:2005 for 50 years reference period of Class RC2 structural members in the ultimate limit state, almost all the columns passed the reliability test except the columns labelled 71 in building A; and C81A and C85 for building B. The highlighted critical columns show the direction for immediate repairs to forestall the initiation of eventual progressive failure of the buildings.
Article Details
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.
References
[2] BS 8110 (1997). Structural use of concrete; Part 1: Code of practice for design and construction. 2nd ed.,United Kingdom
[3] Fapohunda, C. A. (2019). Limit State Design of Reinforced Concrete Structural Elements, 1st ed., Pelikos, Nigeria.
[4] Mosley, W. H. & Bungey, J. H. (1990). Reinforced Concrete Design, 4th ed., Macmillan, London.
[5] Mahrous, A., Ehab, M & Salem, H. (2020). Progressive Collapse Assessment of Post-Tensioned Reinforced Concrete Flat Slab Structures Using AEM, Engineering Failure Analysis, 109, 104278.
[6] Kiakojouri, F., De Biagi, V., Chiaia, B. & Sheidaii, M. R. (2020). Progressive Collapse of Framed Building Structures: Current knowledge and Future Prospects, Engineering Structures, 206, 110061.
[7] Dogan, G. & Arsian, M. H. (2016). Failure Modes of RC Columns Under Loading, International Journal of Scientific and Engineering Research, 7(12), 1279 – 1300.
[8] Premium Times website. [Online]. (2022). Available: https://www.premiumtimesng.com/news/more-news/494724-ikoyi-building-collapse-how-21-storey-building-collapsed-survivor.html.
[9] Utpreksha, V., Vaibhav, B. & Dr. Virendra, K. P. (2020). Design Errors in Building Construction Projects, International Research Journal of Engineering and Technology, 7(7), 3848 – 3855.
[10] Baiburin, A. Kh. (2017). Errors, Defects and Safety Control at Construction Stage, International Conference on Industrial Engineering, 206.
[11] Musa, S. & Obaju, B. (2016). Effects of Design Errors on Construction Projects, International Journal of Scientific and Engineering Research, 7(2), 1099 – 1114.
[12] Uche, O. A. U. & Afolayan, J.O. (2008). Reliability– Based Rating for Reinforced Concrete Columns, Journal of Engineering and Technology, 3(1), 1- 20.
[13] BS 8110 (1985). Structural Use of Concrete; Part 1: Code of practice for design and construction. United Kingdom
[14] Akindahunsi A. A., & Afolayan J. O. (2009). Developed Reliability Based Interaction Curves for Design of Reinforced Concrete Columns, Journals of Theoretical and Applied mechanics, 47, 943 – 955.
[15] Olusola, J.A., Opeyemi, E. O., & Olaseinde, J. A. (2017). Reliability Assessment of BS 8110 (1997) Ultimate Limit State Design Requirements for Reinforced Concrete columns, Jordan Journal of Civil Engineering, 11(3), 512 – 524
[16] Bai, L., Jiang, F. & Fan, B. (2018). Reliability Analysis of Reinforced Concrete Columns after High Temperature under Comprehensive Considering Failure Path, Journal of Nanoscience and Nanotechnology Applications, 2(2), 1 – 8.
[17] Nguyen, H. A, T. (2022). Probabilistic Assessment of Bending Strength of Statically Indeterminate Reinforced Concrete Beams, International Journal of Engineering, Transactions A: Applications, 35(4), 837 - 844
[18] Dehghani, H., & Fadaee, M. J. (2013). Reliability-based Torsional Design of Reinforced Concrete Beams Strengthened with CFRP Laminate, International Journal of Engineering, Transactions A: Basics, 26(10), 1103-1110.
[19] Gilson Company, Inc. website. [Online]. (2019). Available: http://www.globalgilson.com/profoscope-rebar-locators-cover-meters.
[20] Eurocode – Basis of Structural Design, BS EN 1990:2002+A1, 2005.