Pouyan PressComputational Engineering and Physical Modeling2588-69592120190101Wind Pressure Coefficients on Pyramidal Roof of Square Plan Low Rise Double Storey Building1168586810.22115/cepm.2019.144599.1043ENJagbir SinghPh.D. Scholar, Civil Engineering Department, National Institute of Technology, Hamirpur, Himachal Pradesh, India0000000291216581Amrit KumarRoyAssistant Professor, Department of Civil Engineering, National Institute of Technology Hamirpur, Himachal Pradesh-177005, India0000-0003-2439-4086Journal Article20180817<span>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 experminetal measurements. The present study includes wind behaviour 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 coeffiecients increase with increasing roof slopes. The results of the study is helpful in understanding the damage caused on the roof surface during the extreme wind condition.</span>https://www.jcepm.com/article_85868_bf5c5fa0d2aab905702f2ad5593f75eb.pdfPouyan PressComputational Engineering and Physical Modeling2588-69592120190101Comparative Studies of the Effects of Blocking and Water Repellant Agents on Tensile Strengths of Fanpalm17298586910.22115/cepm.2019.146916.1045ENAudu MohammedTaiwoSenior Lecturer, Department of Civil Engineering, University of Abuja, FCT, Abuja, Nigeria0000-0002-5867-7722Raheem AAyindeProfessor, Department of Civil Engineering, Ladoke Akintola University of technology Ogbomoso, Oyo state, NigeriaJournal Article20180829<span>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.</span>https://www.jcepm.com/article_85869_85ffebcf056fc53c40c10436379cb448.pdfPouyan PressComputational Engineering and Physical Modeling2588-69592120190101Investigating on Hydrodynamic Behavior of Slotted Breakwater Walls Under Sea Waves30378616610.22115/cepm.2019.172568.1059ENSeyed Hamid Baiat GhiasiCivil Engineering Department, University of Aveiro, 3810-193 Aveiro, PortugalMohamadamin Oyar HosseinCivil Engineering Department, University of Aveiro, 3810-193 Aveiro, PortugalMostafa AdinehCivil Engineering Department, University of Aveiro, 3810-193 Aveiro, PortugalVahid KhialiCivil Engineering Department, University of Aveiro, 3810-193 Aveiro, PortugalJournal Article20190217Breakwater 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 obtained 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.https://www.jcepm.com/article_86166_7ddcb75d4571201c506792703cb1974e.pdfPouyan PressComputational Engineering and Physical Modeling2588-69592120190101Evaluation of Seismic Behavior of Steel Shear Wall by Time History Analysis38559601510.22115/cepm.2019.160278.1055ENHosein BakhshiAssociate Professor, Department of Civil Engineering, Hakim Sabzevari University, Sabzevar, IranHossein KhosraviAssociate Professor, Department of Civil Engineering, Hakim Sabzevari University, Sabzevar, IranMeysam GhoddusiM.Sc. Student of Structure, Department of Civil Engineering, Hakim Sabzevari University, Sabzevar, IranJournal Article20181208Reducing the vulnerability of buildings against earthquakes is one of the most important issues for engineers and public concern in the last decade. For designers, choosing the best option among the different lateral bracing systems that exist in terms of functional and economic is one of the most important issues in the development and or retrofitting of structures. In recent years, the steel shear wall has gradually acquired its place in the construction industry. However, much research has been done by researchers on this system; but so far, less has been done to analyze seismic behavior of this lateral bracing system At different heights. In this study, seismic behavior of steel shear wall in 3, 6 and 12-story steel structures was investigated by time history analysis method under 3 earthquake records including Northridge 1994, loma prieta 1989 and Imperial valley 1979. The results of this study indicate that the structures with steel shear wall At different heights has shown the desired performance in terms of seismic behavior including input energy, story drift, base shear and Roof center of mass displacement. The results in the 12-story structure were much better than 3 and 6-story structures.https://www.jcepm.com/article_96015_45741872f297128228178d10957d9111.pdfPouyan PressComputational Engineering and Physical Modeling2588-69592120190101Simulation of Priority Queuing at TOTAL Petrol Filling Station in Makurdi Town Using SimEvents Toolkit56669601610.22115/cepm.2019.171928.1060ENPaul TerkumburAdekeDepartment of Civil Engineering, College of Engineering, Federal University of Agriculture Makurdi, Benue State, NigeriaManasseh JoelDepartment of Civil Engineering, College of Engineering, Federal University of Agriculture Makurdi, Benue State, NigeriaJoseph EdehDepartment of Civil Engineering, College of Engineering, Federal University of Agriculture Makurdi, Benue State, NigeriaJournal Article20190218The incessant flash fuel scarcity leading to long queues and prolong waiting time at the TOTAL petrol station along Kashim Ibrahim road in Makurdi town has called for an efficient operational management policy. This study carried out simulation of priority queuing process at the station using SimEvents toolkit in MATLAB software. Field work at the station involved manual count of arriving vehicles and duration of service time of the pumps. It was used for estimating inter-arrival rates (veh/h) and service rate (veh/h) per server. Simulation model was developed using SimEvents toolkit which was simulated for experimental period of 6 hours (360minutes) for the Do-Nothing Scenario on the Normal Queue (NQ) and demand split to a proposed Priority Queue (PQ) at 3%, 5%, 10%, 15%, 20% 25% and 30% of total demand. The split was based on assumed utility maximization of motorist who may be willing to pay extra fare to be served earlier through the PQ in order to reduce waiting time and eliminate risk of waiting on queue by roadside and the stress of waiting on long queues for long period. Results indicated significant reduction in waiting time on queue and queue length on the NQ as compared to the PQ. The optimized service delivery of the system was achieved at 80 – 85% demand on the NQ and 15 – 20% demand on the PQ. Adoption of the built model was therefore recommended for managers of the TOTAL petrol filling stations for optimum system performance and service delivery.https://www.jcepm.com/article_96016_9ab0b666acdd57e26f176acc9b9c9276.pdf