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RISS 인기검색어
- 검색키워드
- 저자 : P. Shashikala (검색결과 7 건)
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Characteristics of CFRP strengthened tubular joints subjected to different monotonic loadings
P.S. Prashob,A.P. Shashikala,T.P. Somasundaran 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.32 No.3
Tubular joints are used in the construction of offshore structures and other land-based structures because of its ease of fabrication. These joints are subjected to different environmental loadings in their lifetime. At the time of fabrication or modification of an existing offshore platform, tubular joints are usually strengthened to withstand the environmental loads. Currently, various strengthening techniques such as ring stiffeners, gusset plates are employed to strengthen new and existing tubular joints. Due to some limitations with the present practices, some new techniques need to be addressed. Many researchers used Fibre Reinforced Polymer (FRP) to strengthen tubular joints. Some of the studies were focused on axial compression of Glass Fibre Reinforced Polymer (GFRP) strengthened tubular joints and found that it was an efficient technique. Earlier, the authors had performed studies on Carbon Fibre Reinforced Polymer (CFRP) strengthened tubular joint subjected to axial compression. The study steered to the conclusion that FRP composites is an alternative strengthening technique for tubular joints. In this work, the study was focused on axial compression of Y-joint and in plane and out of plane bending of T-joints. Experimental investigations were performed on these joints, fabricated from ASTM A106 Gr. B steel. Two sets of joints were fabricated for testing, one is a reference joint and the other is a joint strengthened with CFRP. After performing the set of experiments, test results were then compared with the numerical solution in ANSYS Parametric Design Language (APDL). It was observed that the joints strengthened with CFRP were having improved strength, lesser surface displacement and ovalization when compared to the reference joint.
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Effect of FRP parameters in strengthening the tubular joint for offshore structures
Prashob, P.S.,Shashikala, A.P.,Somasundaran, T.P. Techno-Press 2018 Ocean systems engineering Vol.8 No.4
This paper presents the strengthening of tubular joint by wrapping Carbon fiber reinforced polymer (CFRP) and glass fiber reinforced polymer (GFRP). In this study, total number of layers, stacking sequence and length of wrapping are the different parameters involved when fiber reinforced polymers (FRP) composites are used for strengthening. For this, parameters where varied and results were compared with the reference joint. The best stacking sequence was identified which has the highest value in ultimate load with lesser deflections. For determining the best stacking sequence, numerical investigation was performed on CFRP composites; length of wrapping and number of layers were fixed. Later, the studies were focused on CFRP and GFRP strengthened joint by varying the total number of layers and length of wrapping. An attempt was done to propose a parametric equation from multiple regression analysis, which can be used for CFRP strengthened joints. Hashin failure criteria was used to check the failure of composites. Results revealed that FRP was having a greater influence in the load bearing capacity of joints, and in reducing the deflections and stresses of joint under axial compressive loads. It was also seen that, CFRP was far better than GFRP in reducing the stresses and deflection.
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Review of existing techniques and fibre reinforced polymers used for strengthening tubular joints
Prashob, P.S,Shashikala, A.P.,Somasundaran, T.P. Techno-Press 2017 Structural monitoring and maintenance Vol.4 No.3
Fibre reinforced polymers (FRP) are widely used to strengthen steel structures and retrofitting of existing structures due to its excellent properties. This paper reviews the use of carbon fibre reinforced polymer (CFRP) and glass fibre reinforced polymer (GFRP) in strengthening steel and concrete structures. The paper discusses the use of FRP in strengthening of steel bridges, uses of FRP in repairing of corroded structures and the behaviour of different adhesives. The paper then deals with the FRP strengthened hollow sections and the different failure experienced. The paper then reviewed the current state of art used in strengthening tubular structures and focusing on FRP in strengthening of joints.
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An investigation into the motion and stability behaviour of a RO-RO vessel
Mohan, Poonam,Shashikala, A.P. Techno-Press 2019 Ocean systems engineering Vol.9 No.2
Studies on motion response of a vessel is of great interest to researchers, since a long time. But intensive researches on stability of vessel during motion under dynamic conditions are few. A numerical model of vessel is developed and responses are analyzed in head, beam and quartering sea conditions. Variation of response amplitude operator (RAO) of vessel based on Strip Theory for different wave heights is plotted. Validation of results was done experimentally and numerical results was considered to obtain effect of damping on vessel stability. A scale model ratio of 1:125 was used which is suitable for dimensions of wave flume at National Institute of Technology Calicut. Stability chart are developed based on Mathieu's equation of stability. Ince-Strutt chart developed can help to capture variations of stability with damping.
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Four orthogonal polynomials connected to a regular C-fraction with co-efficients as natural numbers
R. Rangarajan,P. Shashikala 장전수학회 2014 Advanced Studies in Contemporary Mathematics Vol.24 No.4
In the present paper, four orthogonal polynomials are extracted from numerator as well as denominator polynomials of both even and odd order convergents of a regular C-fraction with co-effcients as natural numbers connected to Pade approximants. The two orthogonal polynomials extracted from denominators are shown to be classical othogonal polynomials and two orthogonal polynomials extracted from numerator are shown to be non-classical orthogonal polynomials.
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A pair of classical orthogonal polynomials connected to Catalan numbers
R. Rangarajan,Shashikala P. 장전수학회 2013 Advanced Studies in Contemporary Mathematics Vol.23 No.2
In the present paper, a pair of classical orthogonal polynomials are extracted from denominator polynomials of even and odd order convergents of a regular C- fraction connected to Pade approximants for the generating function of Catalan numbers. The characteristic features of classical orthogonal polynomials are described with the help of their close connections to Chebyshev polynomials of second and third kind.
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Determination of strut efficiency factor for concrete deep beams with and without fibre
Sandeep, M.S.,Nagarajan, Praveen,Shashikala, A.P.,Habeeb, Shehin A. Techno-Press 2016 Advances in computational design Vol.1 No.3
Based on the variation of strain along the cross section, any region in a structural member can be classified into two regions namely, Bernoulli's region (B-region) and Disturbed region (D-region). Since the variation of strain along the cross section for a B-region is linear, well-developed theories are available for their analysis and design. On the other hand, the design of D-region is carried out based on thumb rules and past experience due to the presence of nonlinear strain distribution. Strut-and-Tie method is a novel approach that can be used for the analysis and design of both B-region as well as D-region with equal importance. The strut efficiency factor (${\beta}_s$) is needed for the design and analysis of concrete members using Strut and Tie method. In this paper, equations for finding ${\beta}_s$ for bottle shaped struts in concrete deep beams (a D-region) with and without steel fibres are developed. The effects of transverse reinforcement on ${\beta}_s$ are also considered. Numerical studies using commercially available finite element software along with limited amount of experimental studies were used to find ${\beta}_s$.
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