The Effect os Steel Yielding on CFRP Plated Steel Member by Partial Interaction Theory

Take note on the error "os" which I already complained. Will take sometimes before it will be corrected.

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Abstract 
The reliability in strengthening concrete or steel structures using Carbon Fibre Reinforced Polymer (CFRP) depends on the success of the stress transfer between the two materials. This paper presented a simple numerical approach to simulate the stress transfer by applying partial interaction theory. The numerical approach uses a local bond-slip (τ-δ) model obtained from a previous experimental work. Pull tests were conducted on a dog-bone shaped steel specimens to initiate yielding of the steel. Results from the tests and published data compared with the numerical values show good correlations. These provide useful insights in the existence of full and partial interaction regions along the bonded length of the CFRP.

Keywords: Cfrp; frp; strengthening; steel; bond-slip

Abstrak 
Kebolehpercayaan dalam pengukuhan struktur konkrit atau keluli menggunakan Polimer Bertetulang Gentian Karbon (CFRP) bergantung kepada kejayaan pemindahan tegasan antara kedua-dua bahan tersebut. Kertas kerja ini membentangkan satu pendekatan berangka yang mudah untuk mensimulasikan pemindahan tegasan dengan menggunakan teori interaksi separa. Pendekatan berangka menggunakan model tempatan ikatan-gelincir (τ-δ) yang diperolehi dari kerja eksperimen sebelumnya. Ujian tarikan telah dijalankan ke atas spesimen keluli berbentuk tulang-anjing untuk memulakan alahan keluli. Korelasi yang baik dapat diperhatikan dari perbandingan antara keputusan ujian ini dan keputusan ujian lepas jika dibandingkan dengan kaedah berangka. Ini memberikan pandangan yang berguna dalam kewujudan kawasan interaksi penuh dan separa sepanjang panjang ikatan CFRP.

Kata kunci:Cfrp; frp; gentian karbon terkukuh polimer; keluli

© 2013 Penerbit UTM Press. All rights reserved.

The above article is the abstract of a paper,

Ibrisam Akbar, Deric John Oehlers, M.S. Mohamed Ali (2013). The Effect os Steel Yielding on CFRP Plated Steel Member by Partial Interaction Theory. Jurnal Teknologi. 61(3): 31-39.

Partial and Full Interaction Behaviour of CFRP Plated Steel Member Due to The Yielding of Steel

The reliability of the strengthening of Fibre Reinforced Polymer (FRP) to steel or concrete structures depends on the success of the stress transfer between the FRP plate and steel or concrete element. In order to simulate the stress transfer, a simple numerical approach was developed, employing the partial interaction theory. In this paper, the numerical method applying the partial interaction theory is used to evaluate the debonding of FRP plated steel member due to the yielding of steel. An accurate local bond-slip (-δ) model was adopted in the numerical procedure. A set of pull test specimen was tested to prove the existence of partial and full interaction regions along the bonded length. Comparison with the experimental and published results shows good correlations. 

The above article is the abstract of a paper,

Ibrisam Akbar, Deric John Oehlers, M.S. Mohamed Ali (2012). Partial Interaction Behaviour of FRP Plated Steel Member Due to The Yielding of Steel. 8th Asia Pacific Structural Engineering and Construction Conference and 1st International Conference for Civil Engineering Research. Surabaya, Indonesia. 2-4 October 2012.

A Review of RC Beams Strengthened for Flexure, Shear and Torsion Loading

This paper is intended to review existing literature related to RC beams strengthened for flexure, shear and torsion in order to better understand the behaviour. Review of literature shows that strengthening of RC beams using Carbon Fibre Reinforced Polymers (CFRP) are the most widely and suitable strengthening technique. Moreover, behaviour of RC beams subjected to under torsion, flexure and shear individually as well as in combination of flexure-shear has been widely studied till date. Strengthening of RC beams exhibiting these behaviours is also discussed in detail which shows that number of CFRP strips improve flexural strength whereas inclined CFRP wraps are best suitable to improve shear and torsion behaviour. However combine effects of all behaviours i.e. torsion, flexural and shear have not been together studied so far. Moreover, there is no suitable strengthening technique for RC beams that exhibit these behaviours. Therefore, it can be concluded that there is an opening for researchers to explore this domain.

The above article is the abstract of a paper,

M. Imran, N. Shafiq, I. Akbar, T. Ayub (2012) “ A Review of RC Beams Strengthened for Flexure, Shear and Torsion Loading” International Conference on Civil, Offshore & Environmental Engineering. Kuala Lumpur.

Partial and Full Interaction Behaviour of FRP Plated Steel Member.

Despite its complexity, partial interaction theory is the most accurate in analysing composite structures. The theory was then adapted into the FRP plated concrete structures and subsequently into the FRP plated steel structures. Previous research indicates that partial interaction and full interaction regions exist in the FRP plated steel member under axial load. In this paper, a numerical method applying the partial interaction theory is used to evaluate the plate end debonding of FRP plated steel member. A set of pull test specimen was tested to prove the existence of a full interaction region along the bonded length. Comparison with the previous research also shows that the result from the numerical method agrees well with the visual inspection from the experimental results.

The above article is the abstract of a paper,

Ibrisam Akbar, Deric John Oehlers, M.S. Mohamed Ali (2010). “Partial and Full Interaction Behaviour of FRP Plated Steel Member.” International Conference on Sustainable Building and Infrastucture. Kuala Lumpur.

The Flexural Behaviour of Tubular Steel Member Strengthened With CFRP

Carbon Fibre Reinforced Polymer (FRP) has increasingly become an attractive option for retrofitting steel structures. This paper presents the result of recent study of retrofitting three tubular steel tubes. The tubular steel tubes were cut at the center to represent the loss of steel volume due to corrosion. It was then wrapped with two and four layers of CFRP respectively. The specimens were then tested in a four point loading system and compared to the control specimen. The results show an improved load carrying capacity of the strengthened tubular steel tubes with insignificant reduction of ductility.

The above article is the abstract of a paper,

Ephrem Aragaw and Ibrisam Akbar (2012). The Flexural Behaviour of Tubular Steel Member Strengthened with FRP. 8th Asia Pacific Structural Engineering and Construction Conference and 1st International Conference for Civil Engineering Research. Surabaya, Indonesia. 2-4 October 2012.

The Effect of Saltwater to the Strength of Fibre Reinforced Polymer (FRP) Plated Steel Member

The uses of Fibre Reinforced Polymer (FRP) for strengthening and repair of structures is becoming more established due to  high strength and lightweight properties. However, the bond behaviour of FRP materials to steel structures in offshore environment is quite different from that of onshore due to the existence of corrosion activities. Results on preliminary test  showed the strength of deteriorated steel members increased when FRP is used in offshore environment. The subject of this paper is to investigate the effect of the corrosion activity in the offshore environment to the strength of FRP-to-steel. The experimental program consists of the development of the test specimens, the simulation of saltwater in controlled environment and the pull test conducted in the laboratory. The results indicate that the mode of failure of the FRP is brittle and the ultimate load is reduced.

The above article is the abstract of a paper,

 

1.                Raffizee Ibrahim and Ibrisam Akbar (2012) “The Effect of Saltwater Curing For Fibre Reinforced Polymer (FRP) Plated Steel Member” International Conference on Civil,  Offshore  & Environmental Engineering (ICCOEE 2012). Kuala Lumpur Convention Centre, Kuala Lumpur.