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Author(s): Almir Sales, Francisco Antonio Rocco Lahr
Pages: 1-5 Paper ID:140105-3838-IJCEE-IJENS Published: October, 2014
Abstract:The present study aimed to propose the strength and stiffness classes of Brazilian timbers in the new Brazilian Code for Design of Timbers Structures (draft code NBR 7190:2012). For this purpose the strength and stiffness properties of forty species of tropical and forestation Brazilian timbers were determined and a rigorous statistical analysis was made. In order to determine the strength and stiffness classes, approximately 9,000 individual tests were analyzed, at 12% moisture content. To analyze the data the multivariate analysis and cluster techniques were used. The statistical results defined two sets of classes: one of softwood species with three classes and the other hardwood species with five classes. The adoption of two sets is due to the significant difference in stiffness properties values between the softwood and hardwood species.
Keywords: Stress classes systems, mechanical properties, timber structures, Brazilian timbers.
Full Text (.pdf)  International Journals Of Engineering and Science | 512 KB
Author(s): S. Imam Wahyudi, Henny Pratiwi A., Abdul Rochim, Didier Marot
Pages: 6-10 Paper ID:143705-5959-IJCEE-IJENS Published: October, 2014
Abstract:Tidal flood occurred in some cities in the northern coast of Central Java, Indonesia among others Semarang and Pekalongan. Special for Pekalongan, it has a population of 273,900 people with an area of 4,525 hectares, but 1,920 hectares is inundated by tidal flood. Tidal flood occurs because the sea level is higher than its land. This case has begun 10 years ago and continues to evolve to this day. The cause of the tidal flood is sea level rise, land subsidence and land use changed. Method of handling this problem is done by dividing into 7 sub-drainage system, 2 sub-systems using gravity flow, while 5 other sub-systems using Polder system. This article aims to obtain hydrological analysis and tidal analysis, hydraulics for the dike of channel and retention pond in polder system. The principle of polder system drainage is to isolate an area of the seawater, so it is necessary to remove water pumping. Polder system infrastructure that is needed is a drainage system, retention ponds, dikes, weirs and pump stations.
Keywords: Tidal Flood, hydrologic, Tide, Dike.
Full Text (.pdf)  International Journals Of Engineering and Science | 440 KB