Strength and ductility characteristics of reinforcing steel bars milled from scrap metals

Kankam, Charles K.; Adom-Asamoah, Mark

doi:10.1016/s0261-3069(02)00028-6

Cited by 33 publications

(12 citation statements)

References 1 publication

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“…To cut a long story short, the steel reinforcing bar required for structural concrete is partially or partway produced by the country's inland rolling mills while the balance is sourced through import. The importation is carried out mostly thru private entrepreneurs and the attribute of such imported product is always neither guaranteed nor sure fire, as they are essentially brought in from diverse sources without any comprehensive as well as methodical standardization process regarding their structural properties (Kankam and Adom-Asamoah, 2002;Kankam and Odum-Ewuakye 2001;Logan 2000;Neville and Brooks 1994). Consequently, differences are bound to arise in the strengths, and feasibly, geometry of steel assumed in design as well as those used for actual construction, unless tests are carried out on every batch of imported steel delivered on construction site.…”

Section: Historical Overview Of Steel Production In Nigeriamentioning

confidence: 99%

Costing and Statistical Investigation of Steel Bars Produced from Scrap in Lagos State, Nigeria

C¹,

O²,

A³

2020

cea

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This paper reveals field survey of ten year price distribution and the degree of uncertainty or dispersion in the size geometry of local and imported bars. The study separates cost price and strength the main parameters needed when selecting ideal steel rebars, which is very fundamental to the development of reliable standard of practice for building and civil engineering industry. Lagos highland especially Ogba reinforcement bars sample has the highest mean, standard deviation and coefficient of variation (COV) of Y25 (24.8), Y16 (σ0.095) and (0.81%) respectively. Likewise, the study of the price from various Lagos zone (island and highland) would enable the engineers, project managers or clients construction professionals to assess whether the price different or matches the strength difference. Finally, the research investigation is a basis for the development of acceptable standards or codes of practices for design that takes into account the geometry and strength of materials for construction of RC building and civil infrastructure in Nigeria.

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Section: Historical Overview Of Steel Production In Nigeriamentioning

confidence: 99%

Costing and Statistical Investigation of Steel Bars Produced from Scrap in Lagos State, Nigeria

C¹,

O²,

A³

2020

cea

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“…SOSETRA is located near Dakar and produces about 4000 ton/year of reinforcing steel bars. This quantity is small compared to the steel industry in Ghana which recycles about 80% steel scrap, estimated to be 80,000 ton/year, for the production of structural and reinforcing steel [1]. This is both due to the difficulty in scrap steel supply in Senegal and to the impossibility in processing cast iron because of inadequate manufacturing method.…”

Section: Introductionmentioning

confidence: 95%

Evaluation and improvement of the quality of Senegalese reinforcing steel bars produced from scrap metals

et al. 2009

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a b s t r a c tSenegalese reinforcing steel bars manufactured from scrap steel exhibit poor welding and bending abilities. The purpose of this study is to evaluate and to correlate the geometrical, mechanical and metallurgical characteristics of these steel bars in order to identify possible causes for their breaking during bending. The relevance of the technical specification defined by the manufacturer and its ability to lead to products of good quality will be discussed. A diagram is proposed to control the expected quality of reinforcing bars from a simple Vickers hardness measurement before the final forming stage.

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“…In the event of the wind load being negligible, a notional horizontal load of 1.5% unfactored dead load is permitted by the BS 8110 code of practice. A mean unconfined concrete compressive strength of 20 N/mm 2 and mean yield strength of steel of 375 N/mm 2 measured for concrete cubes and steel reinforcement respectively in laboratory tests (Kankam and Adom-Asamoah, 2002). These tests were undertaken in commercial laboratories over a period of 20 years and deemed representative of RC materials used in Accra, the capital of Ghana.…”

Section: Selection Of Generic Rc Framesmentioning

confidence: 99%

Generation of analytical fragility curves for Ghanaian non-ductile reinforced concrete frame buildings

Adom-Asamoah

2012

Int. J. Phys. Sci.

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This study is on seismic safety evaluation of non-ductile reinforced concrete (RC) frame buildings in Ghana. Generic 3-, 4-and 6-storey non-ductile RC buildings were characterised for assessment. The generic buildings were designed according to British Standard (BS) 8110. The fragility curve parameters were generated using inelastic time history analyses for seismic demand and inelastic pushover analyses for structural capacity of the buildings. As a result of lack of real time histories in Ghana, 3 suites of 100 synthetic time history records each were generated in order to generate lower and upper bounds for inelastic dynamic response. Parameters of collapse fragility curves with 50% probability of exceedance were established for the generic non-ductile Ghanaian frame buildings using short duration near-fault like records. All the curves represent the probability of exceeding the collapse limit state as a function of the peak ground acceleration (PGA) and spectral acceleration at the fundamental mode period of the generic buildings. Using the data from the nonlinear dynamic analysis of the generic buildings under all 300 synthetic time histories, a pair of three sets of fragility curves was developed. Results obtained showed that the generic non-ductile 3 to 6 storey RC frame buildings subjected to near-fault like ground motions may record high probabilities of collapse, if they are situated in 0.25 to 0.35 g PGA seismic zones.

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Strength and ductility characteristics of reinforcing steel bars milled from scrap metals

Cited by 33 publications

References 1 publication

Costing and Statistical Investigation of Steel Bars Produced from Scrap in Lagos State, Nigeria

Costing and Statistical Investigation of Steel Bars Produced from Scrap in Lagos State, Nigeria

Evaluation and improvement of the quality of Senegalese reinforcing steel bars produced from scrap metals

Generation of analytical fragility curves for Ghanaian non-ductile reinforced concrete frame buildings

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