Browsing by Author "Sadiku, S."

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Computer-aided analysis of reinforced concrete waffle bridge deck using the method of grillages
(International Civil Engineering Conference (2018) (ICEC2018)., 2018) Adamu, H. N.; Sadiku, S.; Bala Alhaji
This paper aims to analyse a reinforced concrete waffle bridge deck using method of grillages where the topping and ribs are analysed as a monolithic unit in contrast to the conventional methods where the slab and beams are analyzed differently. In addition, the grillage approach accounts for the torsion that is usually lost in the conventional approach. The slab loading is in line with the HA loading of the BS 5400 part 2 for lightly loaded (accommodation) bridges. One of the strength of this approach is that it is amenable to computer application which has been demonstrated by using a code written in Matrix Laboratory (MATLAB) software and therefore easy for field use by practitioners. For the purpose of rendering this approach amenable to computer application, a program was used to determine the displacements, bending moments and torsional moments in the bridge deck. It is observed that the values of bending moments obtained from grillage analysis are lower than the moments from conventional beam-slab analysis carried out manually. Bending moments and other responses generated by conventional beam-slab approaches are usually exaggerated thereby reducing the anticipated benefits of waffle slab.
PROBABILITY-BASED CALIBRATION OF LOAD DURATION MODIFICATION FACTORS FOR THE NIGERIAN GROWN TIMBER
(NIGERIA JOURNAL OF ENGINEERING AND APPLIED SCIENCES (NJEAS), 2023) Aguwa. J. I.; Sadiku, S.; Afolayan, J. O.; Abdullahi, A.; Abubakar, Mahmud; Kolo, D. N.
All along, load duration modification factors used in Nigeria for design of timber structures were based on BS 5268 of 2002 and this is not a good engineering practice since the strength of timber depends so much on the soil as well as on the environment. There is the need to localize the modification factors based on our environment since Nigerian grown timber is generally used for all timber structures designed and built in Nigeria. Probability-based calibration of load duration modification factors for the Nigerian grown timber was successfully carried out. The results showed significant difference between the calibrated factors and those from BS 5268 of 2002. The calibrated modification factors are; 1.25 for long-term, 1.35 for medium-term, 1.70 for short term, and 2.0 for very short-term duration. This paper recommends the use of these calibrated load duration factors based on Nigerian grown environment.
Probability-Based Calibration of Load Duration Modification Factors for the Nigerian Grown Timber
(2023-01-02) Aguwa, J. I.; Sadiku, S.; Afolayan, J. O.; Aliyu, A.; Abubakar, M.; Kolo, D. N.
All along, load duration modification factors used in Nigeria for design of timber structures were based on BS 5268 of 2002 and this is not a good engineering practice since the strength of timber depends so much on the soil as well as on the environment. There is the need to localize the modification factors based on our environment since Nigerian grown timber is generally used for all timber structures designed and built in Nigeria. Probability-based calibration of load duration modification factors for the Nigerian grown timber was successfully carried out. The results showed significant difference between the calibrated factors and those from BS 5268 of 2002. The calibrated modification factors are; 1.25 for long-term, 1.35 for medium-term, 1.70 for short term, and 2.0 for very short-term duration. This paper recommends the use of these calibrated load duration factors based on Nigerian grown environment.
Reliability-Based Code Calibration in Civil Engineering: A Critical Review
(USEP: Journal of Science and Engineering Production, 2021) Abubakar, Mahmud; Aguwa, J. I.; Abdullahi, M.; Sadiku, S.
The use of new materials and the complexities in modern civil engineering infrastructures call for a systematic attempt to find accurate design solutions. It is clear that deterministic values are not reliable and that their use in the design of civil engineering structures can lead to instant failures. Thus, the use of the probability theory to determine the most reliable value of a parameter for the design of civil engineering structures is very relevant. This work is intended to review the literature on the application of probability theory in the calibration of civil engineering design codes. Consequently, to better evaluate designs and design details, it is important to understand the techniques as highlighted herein.
Top Cited Articles on Structural Engineering Reliability by the Nigerian Authors
(USEP: Journal of Research Information in Civil Engineering, 2020) Abubakar, Mahmud; Aguwa, J. I.; Abdullahi, M.; Sadiku, S.; Oritola, S. F.
This study analyses the characteristics of top-cited articles on structural reliability with at least one author affiliated to Nigeria. A search in the Google Scholar database for articles published between 2010 and 2020 was carried out. From the top-cited articles, variables related to the journal, article, and authors, such as journal ranking from SCImago Journals & Country Rank (SJR), H-index, author affiliations, international research collaboration, and source of funding were collected and descriptively analysed. A sample of 25 original reports was identified from the search. The average citations per year ranged between 0.10 and 6.1. The articles were published in 20 different journals (36% found in only four journals) with five of them based in Nigeria. It was observed, that international collaboration on reliability-based researches was present in 4% of the articles, and funding was reported in just 1 article. Articles having Nigerians as first authors were reported in 100% of the articles. Articles with authors affiliated to ABU, Zaria were more frequent in the sample. A list of top-cited articles is thus, presented to provide an overview of the top-cited articles. This study could aid in supporting further analyses regarding publication, citation behaviours, research funding and international collaboration of structural reliability based researches in Nigeria.