Original Article
Civil Engineering
Jagbir Singh; Amrit Kumar Roy
Abstract
The present study demonstrates the pressure variation due to wind load on a two storey building with a square plan and a pyramidal roof through CFD simulation. Past cyclone reports and other related post-disaster studies have shown loss of lives and extensive property loss mostly in the cyclone-prone ...
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The present study demonstrates the pressure variation due to wind load on a two storey building with a square plan and a pyramidal roof through CFD simulation. Past cyclone reports and other related post-disaster studies have shown loss of lives and extensive property loss mostly in the cyclone-prone regions of India. Post-disaster studies reveal that a pyramidal roof has much better chances of survival in comparison with other roof shapes. ANSYS Fluent has been used for the simulation and ANSYS CFD-Post has been used for observing the wind pressure on building roofs. The simulations are performed using the realizable k-ε turbulent model by considering grid sensitive analysis and validation with previously published wind tunnel experimental measurements. The present study includes wind behavior around the building model with different roof slopes. Comparisons of pressure coefficients are shown for five wind incidence angles to study the effect of wind on the building. Results indicate that both maximum positive and maximum negative wind pressure coefficients increase with increasing roof slopes. The results of the study are helpful in understanding the damage caused on the roof surface during the extreme wind condition.
Original Article
Civil Engineering
Audu Mohammed Taiwo; Raheem Ayinde; Raheem A Ayinde
Abstract
The effects of blocking and water repellant coatings applied on fanpalm specimens on the tensile strength were examined. Fanpalm specimens (coated and uncoated specimens) were soaked in sodium hydroxide solution for specific periods up to 1 year to expose item to alkaline attack. Two groups of coating ...
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The effects of blocking and water repellant coatings applied on fanpalm specimens on the tensile strength were examined. Fanpalm specimens (coated and uncoated specimens) were soaked in sodium hydroxide solution for specific periods up to 1 year to expose item to alkaline attack. Two groups of coating agents (blocking and water repellant agents) were applied as treatment agents. The blocking agents were of three types; sodium sulphate, magnesium sulphate and hydroxylamine, while water repellant agents also were of three types sulphur, bitumen and epoxy. Tensile strength tests were carried out on these specimens and results presented. The result revealed that as the duration of soaking in cement slurry of uncoated fanpalm increases, the nominal ultimate tensile strength of the fanpalm decreases from 107 to 17.50 N/mm2 at 366 days in cement slurry. While the specimens coated with water repellant and blocking agents decreased to 40.67 N/mm2 and 18.33 N/mm2 respectively at 366 days. This shows that coating fanpalm with blocking and water repellants will improved the resistant to chemical attack. up to 270 days. Beyond 270 days the coating specimens with water repellant is more effective. The specimens coated with blocking agents are of lower ultimate strength compared with uncoated specimens within 270 to 366 days in alkaline media.
Original Article
Civil Engineering
Seyed hamid Baiat Ghiasi; Mohamadamin Oyar Hossein; Mostafa Adineh; Vahid Khiali
Abstract
Breakwater walls are buildings that are built to prevent the collapse of the soil or other granular materials and the safety of the sea. One of the destructive phenomena in these structures is the impact of sea wave forces on the overturning phenomenon and instability of the coastal wall, which has damaged ...
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Breakwater walls are buildings that are built to prevent the collapse of the soil or other granular materials and the safety of the sea. One of the destructive phenomena in these structures is the impact of sea wave forces on the overturning phenomenon and instability of the coastal wall, which has damaged the structures existing on these sites. The pattern of interaction between water and seas is complex in coastal structures. In this research, the influence of the different wall heights and soil type changes on wall stability and water pressure distribution in the coastal wall have been investigated. Also, studies will be done on the investigation and optimization of the wall and Finally, by comparing the results obtain with classical methods, the strengths and weaknesses of the classical methods have been analyzed and the effectiveness of these methods (classical) has been evaluated.These walls are made in two types of weighted and flexible (mainly metal) types, in which flexible performance is considered in this research. The behavior of metal shields in front of the water will be examined using the ANSYS software. Several methods for calculating wave forces on perforated coastal walls are also reviewed. In this study, the behavior of the elastic wall is assumed. Coastal walls have been investigated in different hardships and the distribution of pressure and anchor due to hydrodynamic pressure of water on the wall have been investigated. The walls are different in terms of material and amount of rigidity.
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