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Experimental study on strengthening of R.C beam using glass fibre reinforced composite
K.M. Mini,Rini John Alapatt,Anjana Elizabeth David,Aswathy Radhakrishnan,Minu Maria Cyriac,R. Ramakrishnan 국제구조공학회 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.50 No.3
This paper reports the influence of number of layers and length of GFRP sheets wrapped onto RCC beams for strengthening. Twelve beams of size 700mm × 150mm × 150mm were cast and tested. Two beams without GFRP and ten beams wrapped in different lay-up patterns with one and two layers of GFRP sheets was subjected to three point loading test and ultrasonic pulse velocity test. Initial crack load, ultimate failure load and types of failure have been observed and noted. Experimental results indicate a significantincrease in initial and ultimate load carrying capacity of GFRP wrapped beams compared to unwrapped beams. The failed control specimen was retrofitted using U wrap scheme and tested under three point loading.
Experimental study on strengthening of R.C beam using glass fibre reinforced composite
Mini, K.M.,Alapatt, Rini John,David, Anjana Elizabeth,Radhakrishnan, Aswathy,Cyriac, Minu Maria,Ramakrishnan, R. Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.50 No.3
This paper reports the influence of number of layers and length of GFRP sheets wrapped onto RCC beams for strengthening. Twelve beams of size $700mm{\times}150mm{\times}150mm$ were cast and tested. Two beams without GFRP and ten beams wrapped in different lay-up patterns with one and two layers of GFRP sheets was subjected to three point loading test and ultrasonic pulse velocity test. Initial crack load, ultimate failure load and types of failure have been observed and noted. Experimental results indicate a significant increase in initial and ultimate load carrying capacity of GFRP wrapped beams compared to unwrapped beams. The failed control specimen was retrofitted using U wrap scheme and tested under three point loading.
Effect of volume fraction on stability analysis of glass fibre reinforced composite plate
K.M.Mini,Mahadevan Lakshmanan,Lubin Mathew,Girish Kaimal 국제구조공학회 2012 Steel and Composite Structures, An International J Vol.12 No.2
This paper deals with an experimental investigation to study the effect of fibre content on the stability of composite plates with various aspect ratios. Epoxy based glass fibre reinforced composite plates with aspect ratio varying from 0.4 to 1 and with volume fractions of 0.36, 0.4, 0.46, 0.49 and 0.55 are used for the investigation. From the study it is observed that for plate with aspect ratio of 0.5 and 0.4 there is no buckling and the plate got crushed at the middle. As the volume fraction increases the buckling load also increases to a limit and then began to reduce with further increase in fibre content. The optimum range of fibre content for maximum stability is found between 0.49 and 0.55. Polynomial expressions are developed for the study of buckling behaviour of composite plates with different volume fractions in terms of load and aspect ratio.
Kumar, K. Varun,Saravanan, T. Jothi,Sreekala, R.,Gopalakrishnan, N.,Mini, K.M. Techno-Press 2017 Geomechanics & engineering Vol.12 No.1
This paper investigates the damage identification of the concrete pile element through axial wave propagation technique using computational and experimental studies. Now-a-days, concrete pile foundations are often common in all engineering structures and their safety is significant for preventing the failure. Damage detection and estimation in a sub-structure is challenging as the visual picture of the sub-structure and its condition is not well known and the state of the structure or foundation can be inferred only through its static and dynamic response. The concept of wave propagation involves dynamic impedance and whenever a wave encounters a changing impedance (due to loss of stiffness), a reflecting wave is generated with the total strain energy forked as reflected as well as refracted portions. Among many frequency domain methods, the Spectral Finite Element method (SFEM) has been found suitable for analysis of wave propagation in real engineering structures as the formulation is based on dynamic equilibrium under harmonic steady state excitation. The feasibility of the axial wave propagation technique is studied through numerical simulations using Elementary rod theory and higher order Love rod theory under SFEM and ABAQUS dynamic explicit analysis with experimental validation exercise. Towards simulating the damage scenario in a pile element, dis-continuity (impedance mismatch) is induced by varying its cross-sectional area along its length. Both experimental and computational investigations are performed under pulse-echo and pitch-catch configuration methods. Analytical and experimental results are in good agreement.
Neural network based modeling of infilled steel frames
Subramanian, K.,Mini, K.M.,Josephine Kelvina Florence, S. Techno-Press 2005 Structural Engineering and Mechanics, An Int'l Jou Vol.21 No.5
A neural network based model is developed for the structural analysis of masonry infilled steel frames, which can account for the non-linearities in the material properties and structural behaviour. Using the data available from the analytical methods, an ANN model with input parameters consisting of dimension of frame, size of infill, properties of steel and infill was developed. It was found to be acceptable in predicting the failure modes of infilled frames and corresponding failure load subject to limitations in the training data and the predicted results are tested using the available experimental results. The study shows the importance of validating the ANN models in simulating structural behaviour especially when the data are limited. The ANN model was also compared with the available experimental results and was found to perform well.
Strengthening Steel Members with Holes Under Tension Using Unidirectional GFRP Sheets
E. Parvathi,Mahadevan Lakshmanan,K. M. Mini 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.2
Steel structure sections are often connected using bolts and rivets, which necessitates the need for holes. These holes provide a zone of failure during loading. In the present work an attempt is made to strengthen the steel members under tensile loading with hole provision for bolts, using Glass Fiber Reinforced Polymer (GFRP) sheets. The performance of FRP wrapping is assessed by changing the angle of orientation of fi ber. The experimental investigation is conducted for one hole, two hole and staggered hole arrangement and the results are compared with fi nite element analysis. The diff erence between experiment and fi nite element modeling are within allowable limits. From the study it is found that GFRP wrapping with 0° orientation of fi ber is the most suitable in terms of ultimate strength for all the three hole confi gurations.
Performance evaluation of natural fiber reinforced high volume fly ash foam concrete cladding
Raj, Amritha,Sathyan, Dhanya,Mini, K.M. Techno-Press 2021 Advances in concrete construction Vol.11 No.2
The major shortcoming of concrete in most of the applications is its high self-weight and thermal conductivity. The emerging trend to overcome these shortcomings is the use of foam-concrete, which is a lightweight concrete consisting of cement, filler, water and a foaming agent. This study aims at the development of a cost-effective high-volume fly-ash foam-concrete insulation wall cladding for existing buildings using natural fiber like rice straw in different proportions. The paper reports the results of systematic studies on various mechanical, acoustic, thermal and durability properties of foam-concrete with and without replacement of cement by fly-ash. Fly-ash replaces 60 percent by weight of cement in foam-concrete. The water-solid ratio of 0.3, the filler ratio of 1:1 by weight, and the density of 1100 kg/㎥ (approx.) are fixed for all the mixes. Rice straw at 1%, 3% and 5% by weight of cement was added to improve the thermal and acoustic efficiency. From the investigations, it was inferred that the strength properties were increased with fly-ash replacement up to 1% rice straw addition. In furtherance, addition of rice straw and fly-ash resulted in improved acoustic and thermal properties.
A Critical Review on Assessment of Self Healing Performance of Bioconcrete
Prabhath Ranjan Kumar Soda,Mini K. M. 대한토목학회 2023 KSCE Journal of Civil Engineering Vol.27 No.2
Bio concrete has been researched a lot worldwide in recent years by several researchers. Even though the concept of different self-healing strategies is not the same but the outcome is the same; to heal the cracks that occur in concrete and recover its strength and durability. Bio concrete contains spores that become active and precipitate calcite in the presence of oxygen and nutrients. As a consequence, the cracks get filled with calcite and seals the crack partially or completely. There are experimental techniques to examine self-healing efficiency in cement mortar and concrete. Experiments like the rate of water penetration and UPV are frequently used in research by several research groups. The test methodologies, protocols, specimen sizes, and shapes may differ according to the healing agent and property to be checked. Different research groups developed their own testing protocols to examine healing efficiency. The current paper made a critical review on self healing assessement with a variety of test procedures that has been used by several researchers from the invention of bio concrete till now. The methodologies are mainly to examine the viability of bacteria inside concrete, identification of calcite precipitated by bacteria, regained strength and durability after healing.