Proposal for design rules of axially loaded CFRP strengthened cold formed lipped channel steel sections

Kalavagunta, Sreedhar; Naganathan, Sivakumar; Mustapha, Kamal Nasharuddin

doi:10.1016/j.tws.2013.06.006

Cited by 32 publications

(24 citation statements)

References 22 publications

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“…The aim of the study was to analyse the cracking process in the CFRP layer and in the adhesive layer. Axially compressed thin-walled C-section reinforced with CFRP bars have been described in [ 4 , 5 ]. In [ 6 ], the behaviour of damaged steel thin-walled I-beams retrofitted with a carbon fibre mat (CFRP) is discussed.…”

Section: Introductionmentioning

confidence: 99%

Laboratory and Numerical Analysis of Steel Cold-Formed Sigma Beams Retrofitted by Bonded CFRP Tapes

et al. 2020

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In this paper, the retrofitting method of thin-walled, cold-formed sigma beams using bonded carbon fibre reinforced polymer (CFRP) tapes is proposed. The effectiveness of the presented strengthening method is investigated by the means of laboratory tests and numerical analysis conducted on simply supported, single-span beams made of 200 × 70 × 2 profile by “Blachy Pruszyński” subjected to a four-point bending scheme. Special attention is paid to the evaluation of possibility to increase the load capacity with simultaneous limitation of beams displacements by appropriate location of CFRP tapes. For this purpose, three beams were reinforced with CFRP tape placed on the inner surface of the upper flange, three with CFRP tape on the inner surface of the web, three beams with reinforcement located on the inner surface of the bottom flange, and two beams were tested as reference beams without reinforcement. CFRP tape with a width of 50 mm and a thickness of 1.2 mm was used as the reinforcement and was bonded to the beams by SikaDur®-30 adhesive. Precise strain measurement was made using electrofusion strain gauges, and displacement measurement was performed using two Aramis coupled devices in combination with the Tritop machine. Numerical models of the considered beams were developed in the Finite Element Method (FEM) program Abaqus®. Experimental and numerical analysis made it possible to obtain a very high agreement of results. Based on the conducted research, it was proved how important is the impact of the applied reinforcement (CFRP tapes) in thin-walled steel structures, with respect to the classic methods of strengthening steel building structures.

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Section: Introductionmentioning

confidence: 99%

Laboratory and Numerical Analysis of Steel Cold-Formed Sigma Beams Retrofitted by Bonded CFRP Tapes

et al. 2020

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“…Most commonly the use of Glass Fiber Reinforced Polymer (GFRP) and Carbon Fiber Reinforced Polymer (CFRP) were prominent. Sreedhar Kalavagunta et.al [1] did theoretical and experimental investigation and came up with a proposed design of axially loaded CFRP retrofitted cold formed steel lipped channel sections. The elastic modulus of the composite section along with CFRP strip by neglecting the layer of bonding agent was expressed by them.…”

Section: Introductionmentioning

confidence: 99%

Behavior of AFRP Composite and its Practical Aspects in the Invigoration of Structural and Materialistic Properties of Corroded SHTS

Modak,

Das,

Kumar

2019

IJEAT

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The usage of effective composite materials currently became a regular trend in different field of industrial works and production factories. Composite materials being having a property of fulfilling more than one property simultaneously became an effective material recently in practical life. Fiber Reinforced Polymer (FRP) composite, due to its low weight, high stiffness huge load carrying capacity, corrosion less property, it became a friendly material for different engineering purposes where materials get include. In the world of Civil Engineering, Aeronautical Engineering, Mechanical Engineering and Automobile Engineering, currently the trend of FRP became very familiar for increasing the strength of materials for different properties and from different orientations. Strengthening and retrofitting of any structural elements become mandatory when the structure gets distressed due to several loading and aging effects. This research paper contains the concept of Aramid Fiber Reinforced Polymer (AFRP) composite and its application in the strengthening of corroded Steel Hollow Tubular Sections (SHTS). The improvement in the properties of SHTS after applying AFRP is discussed in this research content and its polymerization effect on strengthening. To establish a comparison on the recent research trend in this area, a special way of retrofication scheme was involved in this investigation, by following a practice of spiral or helical wrapping of AFRP to achieve a continues stiffness with a uniform unity across the height of the column. To analyze the proposed strengthening scheme, a comparative study has been done with respect to the traditional approach. A series of experimental investigation was done to come up with the result and later a brief discussion has been done regarding the usage of AFRP in different fields of Engineering. Totally 21 samples were casted both in horizontal and spiral jacketing and tested experimentally under axial compressive load by sustaining several parameters to observe the variation in the change of the properties of SHTS to verify the axial load carrying capacity along with the stiffness and Young’s modulus. The experimental investigation showed that there is a remarkable improvement in the properties of AFRP strengthened specimens with respect to different parameters after the application AFRP and the effect of its polymerization with the bonding agent. Thus after the strengthening of column specimens with AFRP, the overall increment in the load ringing capacity of the SHTS was 23.27% and also the proposed scheme of spiral wrapping provided a superior result as compared to the traditional method of horizontal stripping.

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“…By studying a number of compression members, Harries et al [5] found that a small amount of FRP materials could improve buckling resistance, energy absorption and final ductility. Kalavagunta et al [6] experimentally studied a CFRP bonded lipped channel column under axial load. It was understood that the load-bearing capacity in the fully reinforced section was increased by 16.75 % and in the web-reinforced member increased by 10.26 %.…”

Section: Introductionmentioning

confidence: 99%

Numerical and Experimental Study on Deficient Short Steel Tubes Strengthened with CFRP Under Compression

Ghaemdoust¹,

Yousefi²,

Narmashiri³

et al. 2019

Period. Polytech. Civil Eng.

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In view of development and repair costs, support of structures is imperative. Several factors, for example, design and calculation errors, absence of appropriate installation, change of structures application, exhaustion, seismic tremor, fire and natural conditions diminish their strength. In such cases, structures have need of rehabilitation and restoration to achieve their original performance. One of the most up to date materials for retrofitting is carbon fiber reinforced polymer (CFRP) that can provide an amount of restriction to postpone buckling of thin steel walls. This paper provides a numerical and experimental investigation on CFRP strengthened short steel tubes with initial horizontal and vertical deficiency under compression. Ten square and circular specimens were tested to study effects of the following parameters: (1) position of deficiency, horizontal or vertical; (2) tube shape, square or circular; (3) CFRP strengthening. In the experiments, axial static loading was gradually applied and for the numerical study three-dimensional (3D) static nonlinear analysis method using ABAQUS software was performed. The results show that deficiency reduces load-bearing capacity of steel columns and the impact of horizontal deficiency is higher than the impact of vertical deficiency, in both square and circular tubes. Use of CFRP materials for strengthening of short steel columns with initial deficiency indicates that fibers play a considerable role on increasing load bearing capacity, reducing stress at the damage location, preventing deformation caused by deficiency and delaying local buckling. Both numerical and experimental outcomes are in good agreement, which underlines the accuracy of the models adopted.

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Proposal for design rules of axially loaded CFRP strengthened cold formed lipped channel steel sections

Cited by 32 publications

References 22 publications

Laboratory and Numerical Analysis of Steel Cold-Formed Sigma Beams Retrofitted by Bonded CFRP Tapes

Laboratory and Numerical Analysis of Steel Cold-Formed Sigma Beams Retrofitted by Bonded CFRP Tapes

Behavior of AFRP Composite and its Practical Aspects in the Invigoration of Structural and Materialistic Properties of Corroded SHTS

Numerical and Experimental Study on Deficient Short Steel Tubes Strengthened with CFRP Under Compression

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