Strengthening of Hollow Square Sections under Compression Using FRP Composites

Sundarraja, M.C.; Sriram, P.; Prabhu, G. Ganesh

doi:10.1155/2014/396597

Cited by 22 publications

(14 citation statements)

References 19 publications

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“…Secondly, on cold formed lipped steel channel sections strengthened with CFRP, both experimental and analytical study were conducted and the test results revealed that, the load carrying capacity of strengthened specimens were increased by 16.75%. In 2014, to authenticate the estate of CFRP in hollow steel structures, M C Sundarraja et al [1] went through a series of experiments and analytical study in the axial behavior of hollow square steel sections strengthened with CFRP. By changing the parameters such as width of CFRP strips, number of layers they studied the confinement of CFRP strips in the strengthening of hollow steel sections.…”

Section: Related Workmentioning

confidence: 99%

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Axial Behavior of Corroded CHST Members Confined with AFRP Sheets

Modak¹,

Sivasankar²

2019

IJRTE

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Strengthening of structural members is a mechanism of promoting structures to upgrade its attainment under existing loads or to boost the fortitude of structural members to carry further loads. Any frailty at the time of designing or any other construction errors may lead to the cause of structural deterioration causing failures of the structural members. This paper presents an experimental study on the behavior of corroded Circular Hollow Steel Tubular (CHST) members strengthened with Aramid Fiber Reinforced Polymer (AFRP) composites. In this field, the experimental investigation is narrowed up to the usage of Glass Fiber Reinforced Polymer (GFRP) and Carbon Fiber Reinforced polymer (CFRP) and also in the application procedure i.e., the wrapping scheme. Prime advantages of AFRP over steel members are low weight, highly durable, corrosion resistance and easy applicability. The workability and the consonance of AFRP were studied in this paper to evaluate the confinement of AFRP in the strengthening effect of CHST members. The main deprivation of AFRP is the cost alone. So, in this experimental process, instead of going full wrapping, a special technique of spiral wrapping was adopted to get the closed confinement of AFRP. Totally twelve specimens were casted and tested to execute the experimental work including both control and wrapped specimens by controlling different parameters up to the failure mode. The experimental results uttered the increment in the load carrying capacity of the wrapped specimens. The involvement of AFRP in the better confinement was observed in the experimental results with the increase in the number of layers of AFRP strips. From the series of experiments, the results which were collected were compared with the control sample to determine the variation and then the axial stress-strain curve and load deflection curve were studied. It was also observed that, the local buckling was getting delayed with the increase in the number of layers of AFRP strips.

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Section: Related Workmentioning

confidence: 99%

“…Steel structure being structurally sound such as high strength-to weight ratio, long durability, less weight, huge energy consumption capacity, high torsional austerity and so other factors. In recent times, the economical gratifications have also been identified by the engineers and the designers [1].…”

Section: Introductionmentioning

confidence: 99%

Axial Behavior of Corroded CHST Members Confined with AFRP Sheets

Modak¹,

Sivasankar²

2019

IJRTE

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“…Most of the research conducted in this area has focused on three parts: firstly, retrofit the beam with CFRP, including reinforcing damaged steel beams [3,9,10,12,16] and undamaged steel beams [4,5,14]. These works show that the ultimate load capacity of steel beams was improved after reinforced with CFRP; secondly, using CFRP to reinforce the axial compressive steel members [6,8,11,13,15,19,21], the reinforced specimen section includes the T, H, circular and square tube section. These literatures indicate that the CFRP can improve the flange and web local buckling or flexural torsional buckling load capacity.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on behavior of steel channel strengthened with CFRP

Tang

Deng

Zhou

2017

Curved and Layered Structures

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This paper describes the behaviour of axially loaded long and eccentrically loaded short thin-walled steel channels, strengthened with transversely bonded carbon fibre reinforced polymer (CFRP) sheets. Seven long members, each 1400 mm long, and seven short members, each 750 mm long, were tested. The main parameters were the number of CFRP plies (one or two) and the clear spacing between the CFRP strips (50, 100 or 150 mm). The effect of CFRP sheet layer and clear spacing was studied. All the ultimate load capacity of the reinforced members was improved in different extent. A maximum strength gain of 9.13% was achieved for long members with two CFRP layers and 50 mm spacing of CFRP strips. The experimental results show that the global buckling happens to all the long specimens. For short members, the maximum strength gain of 12.1% was achieved with two CFRP layers and 50 mm spacing of CFRP strips. With the exception of the most heavily reinforced (2 plies at 50 and 100 mm), local buckling was observed prior to global buckling for short members, which was completely opposite of the control specimens. Meanwhile, when the clear spacing of CFRP strips is greater than the web height of steel channel, the transversely bonded CFRP does not have a significant improvement in buckling load capacity of the short-and long-channel components. While the clear spacing is less than the web height, the more number of CFRP layer, the more enhancement of buckling load capacity.

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“…The composites, which are light in weight, high in strength, and can be manufactured according to the required performance, have been accepted in industrial fields. With the rapid development of aerospace, composites have been one of the four structural materials after aluminum, steel, and titanium materials . At present, both the macro‐ and micro‐mechanical methods are used to analyze the mechanical behaviors of composite structures .…”

Section: Introductionmentioning

confidence: 99%

Numerical investigations of microscopic characteristic influences on the mechanical properties of polymer‐matrix composites

Qiu

Chen

et al. 2015

Polymer Composites

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In this study, an isoparametric micro‐mechanical model is developed to study the failure behaviors under biaxial loadings for composites with different fiber arrangements. For validating the method, the numerical results of the unidirectional (UD) composite lamina with consideration of two different failure criteria (the constituent failure criterion and UD failure criterion) are compared with the experimental results. On this basis, the fiber arrangements and fiber off‐axis angles influence on the failure envelopes for the UD composite lamina are studied. Furthermore, the failure strength of a typical composite laminates is also investigated. The results show that the failure strength of composite laminates is closely dependent on the fiber arrangements. Compared with the hexagonal packing, the square diagonal packing provides the higher failure strengths. POLYM. COMPOS., 38:2734–2742, 2017. © 2015 Society of Plastics Engineers

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Strengthening of Hollow Square Sections under Compression Using FRP Composites

Cited by 22 publications

References 19 publications

Axial Behavior of Corroded CHST Members Confined with AFRP Sheets

Axial Behavior of Corroded CHST Members Confined with AFRP Sheets

Experimental study on behavior of steel channel strengthened with CFRP

Numerical investigations of microscopic characteristic influences on the mechanical properties of polymer‐matrix composites

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