Sustainable development of the built environment in developing countries is a major challenge in the 21st century. The use of local materials in the construction of buildings is one of the potential ways to support sustainable development in both urban and rural areas where burnt clay bricks are used predominantly. This work focuses mainly on the use of polypropylene micro fibers in ordinary Cellular Lightweight Concrete blocks. The main objective is to develop a high-performance fibre reinforced cellular concrete to provide a better alternative than clay bricks for structural applications of masonry. This paper presents the stress-strain behaviour of polypropylene fibre reinforced Cellular Lightweight Concrete stack bonded prisms under axial compression. Masonry compressive strength is typically obtained by testing stack bonded prisms under compression normal to its bed joint. Use of micro-fibres enhances the pre-cracking behaviour of masonry by arresting cracks at micro-scale in the post-peak region. These efforts are necessary to ensure that CLC blocks become more accepted in the world of building materials and considered as a reliable option for providing low-cost housing.
This paper presents the stress-strain behaviour of Natural Banana microfibre reinforced Lightweight Concrete (LWC) prisms under axial compression. The compressive strength of masonry is obtained by testing stack bonded prisms under compression normal to its bed joint. LWC blocks of cross-sectional dimensions 200 mm x 150 mm were used to construct the prism with an overall height of 630 mm. Three series of specimens were cast; (a) prism without Banana fibre (control), (b) prism with Banana microfibres, (c) prism with Banana microfibres sandwiched with Glass Fibre Reinforced Polymer (GFRP) sheets. Natural Banana fibres were used as structural fibre reinforcement at different volume fractions (VF). The results indicate that the presence of fibres helps to improve the strength, stiffness, and ductility of LWC stack bonded prisms under compression. The test results also indicate that banana fibre reinforcement provides an improved crack bridging mechanism at both micro and macro levels. The GFRP sandwiched prism specimens exhibited excellent ductility and load-carrying capacity resulting from improved plastic deformation tolerance under compression and bonding between the LWC block and GFRP sheet.
Este estudio presenta la investigación experimental llevada a cabo en una columna de hormigón de arcilla expandida confinada por tubo de acero perforado reforzado por láminas de polímero reforzado con fibra de vidrio (GFRP) bajo compresión uniaxial. Se consideraron dos parámetros para la investigación experimental: El diámetro del tubo de acero perforado (5 mm y 10 mm) y el número de capas de envoltura GFRP (1,2, 3 y 4 capas). El comportamiento de compresión de la columna confinada de acero perforado se comparó con la columna de hormigón encerrada de tubo GFRP y la columna de hormigón encerrada de tubo de acero liso. Se discutió el efecto del diámetro de perforación y las capas GFRP, en el patrón de falla, la respuesta de tensión-deformación unitaria y la ductilidad de la columna. A partir de este estudio, se puede concluir que el envoltorio GFRP y el tubo de acero perforado ejercen todo el potencial para mejorar el comportamiento de compresión de la columna de hormigón agregado de arcilla expandida. El modo de falla de la columna de tubo de acero perforado envuelto GFRP era dúctil en la naturaleza. La falla comenzó con la ruptura de las capas de GFRP seguidas de la producción de tubo de acero perforado y finalmente la trituración de hormigón central. El envoltorio GFRP proporciona resistencia a la tracción adicional a la columna y al tubo de acero perforado con su comportamiento plástico elasto mejora el comportamiento previo y posterior al pico de la columna. Se observó un mejor rendimiento de ductilidad en la columna con un mayor número de envoltura y columna GFRP con perforación de 10 mm de diámetro.
SummaryIn the present paper, numerical investigations was carried out on a 1:45 scaled model of DSI nine sided polygonal non-ship shaped FPSO, by varying different parameters of the model. Parameters such as inlet pipe radius, and moonpool radius was considered for the study and the variation of the RAO in surge and heave were plotted and reported in the present paper. Previously, experiment were conducted by the author on a 1:45 scale DSI nine sided polygonal non-ship shaped FPSO model with three different mooring arrangements viz. 100% turret mooring, 50% vessel and 50% turret mooring, and 100% vessel mooring. Author also conducted experiments on the model with different sizes of damping plates attached at the keel and skirt portion of the model to study its influence on the responses of the vessel and comparison was made with numerical result obtained from Wave analysis, MIT (WAMIT) software. Numerical study was carried out in WAMIT on the scaled model and the results were compared with those obtained from model tests in the wave basin.
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