CFRP-wrapped hollow steel tubes under axial impact loading

Batuwitage, Chamila Rajeev Jayanath; Fawzia, Sabrina; Thambiratnam, David; Tafsirojjaman, T.; Al-Mahaidi, Riadh; Elchalakani, Mohamed

doi:10.1201/9781351210843-50

Cited by 13 publications

(8 citation statements)

References 1 publication

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“…For this method, heavy machinery and the use of scaffolding are required as well as service interruptions over long periods [4]. On the other hand, strengthening and rehabilitation methods by using carbon fiber reinforced polymer (CFRP) composites can overcome these drawbacks and have many other advantages over steel plates such as superior strength-weight ratio and high tensile strength [5], corrosion resistive [6], cost-effective as it requires less labor and preparation , easy applicability within limited access, higher flexibility and can form any required shape [7,8]. Past research has shown the effectiveness of the CFRP strengthening technique to increase the load carrying capacity [9], impact resistance capacity [10] and tip displacement reduction capacity of steel structures [11].…”

Section: Introductionmentioning

confidence: 99%

Behaviour of CFRP strengthened CHS members under monotonic and cyclic loading

Tafsirojjaman

Fawzia

Thambiratnam

et al. 2019

Composite Structures

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Tubular hollow members, though used in many civil and mechanical applications, are highly vulnerable structural elements when subjected to cyclic loading. They have been used extensively in both onshore and offshore civil infrastructure where cyclic loading can result from earthquake, waves, currents and wind. Thus, tubular hollow steel members may be required to undergo strengthening to withstand both static and cyclic loads. In the present study externally-bonded carbon fibre reinforced polymer (CFRP) has been used to strengthen the circular hollow section (CHS) steel specimens. A series of experiments on bare and CFRP strengthened CHS steel specimens subjected to monotonic and cyclic loading at the tip has been conducted to investigate the effect of CFRP strengthening technique on the structural behaviour of strengthened members under monotonic and cyclic loading. The results showed that the CFRP strengthening is effective to enhance the cyclic performance of CHS steel members by improving the moment capacity, moment degradation behaviour, secant stiffness, Please cite this articla as, "Tafsirojjaman T, Fawzia S, Thambiratnam D, Zhao XL. Behaviour of CFRP strengthened CHS members under monotonic and cyclic loading. Compos Struct 2019;220:592-601." energy dissipation capacity and ductility compared to bare steel CHS members. In addition, the moment capacity of CHSs has been improved under monotonic loading due to the CFRP strengthening as well. Moreover, the impact of adhesive types on the structural response of the strengthened specimens was also investigated. This information will be helpful in the strengthening of CHSs for their intended applications.

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Section: Introductionmentioning

confidence: 99%

Behaviour of CFRP strengthened CHS members under monotonic and cyclic loading

Tafsirojjaman

Fawzia

Thambiratnam

et al. 2019

Composite Structures

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“…The fatigue behaviour of the steel plates [28,29] and steel members [30] have been improved by strengthening with FRP. Moreover, the FRP strengthening technique also showed its effectiveness in enhancing the impact performance of steel members [31,32].…”

Section: Introductionmentioning

confidence: 97%

Structural behaviour of CFRP strengthened beam-column connections under monotonic and cyclic loading

2021

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Welded beam-column connections may be vulnerable to failure under cyclic loading conditions. These connections might require strengthening to resist static and cyclic loads as they may exhibit inadequate capacity due to the design errors or material properties degradation because of severe environmental effects or an increase in service loads. With this in mind, a series of full-scale experiments have been conducted to investigate the behaviour of the bare and strengthened welded beam-column connections under both monotonic and largedisplacement cyclic loading. Carbon fibre reinforced polymer (CFRP) is used as the strengthening material in the present study along with epoxy adhesive as the bonding material.The experimental study conclusively showed the benefits of CFRP composites to improve the performance of welded connections under both monotonic and cyclic loadings. Under monotonic loading, the ultimate moment capacity, stiffness, dissipation of energy and ductility of the welded connections improved by strengthening with CFRP. Additionally, under cyclic loading, the CFRP strengthened welded connections showed improvement in moment hysteresis behaviour, higher stiffness and energy dissipation capacity compared to their bare counterparts. Moreover, the experimentally obtained moment capacities match reasonably well with the theoretically predicted moment capacities.

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“…Steel frames have shown less tip displacement when strengthened with CFRP [22,23]. Moreover, CFRP also has shown its effectiveness in enhancing the impact resistance capacity of steel members [24,25].…”

Section: Introductionmentioning

confidence: 99%

Performance of FRP strengthened full-scale simply-supported circular hollow steel members under monotonic and large-displacement cyclic loading

Tafsirojjaman

Fawzia

Thambiratnam

et al. 2021

Engineering Structures

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Steel structures are becoming more common in engineering construction as steel possesses excellent ductility, but steel members are often vulnerable to buckling, especially under seismic or cyclic loading. Hollow structural sections (HSS) often buckle locally under loading due to their thin steel walls and the need for rehabilitation and strengthening is increasing. In the present study, circular hollow section (CHS) steel members have been strengthened with both carbon fibre reinforced polymer (CFRP) and glass fibre reinforced polymer (GFRP). Their structural performance, along with that of their bare counterparts, is investigated subjected to monotonic and quasi-static large-displacement cyclic loading experimentally. The types of FRP reinforcement (CFRP and GFRP) and the loading condition (monotonic and cyclic) are chosen as two main parameters in the test program. Results reveal the significant structural improvements of the strengthened CHS members under monotonic and cyclic loading. The ultimate moment capacities of the beams under monotonic and cyclic loading are enhanced by 51.0% and 35.4% respectively with CRFP strengthening and 43.3% and 31.5% respectively with GFRP strengthening compared to the bare beam. In addition, all the FRP strengthened specimens achieved higher moment capacities, rotational capacities, stiffness, energy dissipation capacities and ductility in comparison to their bare counterparts. Moreover, there is a good agreement found between the experimental and theoretically predicted ultimate moment capacities of the bare and strengthened CHSs with a mean ratio of 1.04 and a COV of 0.05.

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CFRP-wrapped hollow steel tubes under axial impact loading

Cited by 13 publications

References 1 publication

Behaviour of CFRP strengthened CHS members under monotonic and cyclic loading

Behaviour of CFRP strengthened CHS members under monotonic and cyclic loading

Structural behaviour of CFRP strengthened beam-column connections under monotonic and cyclic loading

Performance of FRP strengthened full-scale simply-supported circular hollow steel members under monotonic and large-displacement cyclic loading

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