2019 CSCE Annual Conference - Laval (Greater Montreal)

2019 CSCE Annual Conference - Laval (Greater Montreal) Conference


Title
Design and Testing of Pre-engineered Prefabricated Casuarina Wooden Truss


Author(s)
Ms. Julia Said, The American Univesity in Cairo (Presenter)
Mrs. Sahar Bader, The American University in Cairo
Mr. Marwan Rashad, The American University in Cairo
Mr. Mahmoud Fayez, AUC
Mr. omar tohami
Mr. Amro Mahmoud, Auc
Dr. Ezzeldin Yazeed, The American University in Cairo
Dr. Khaled Nassar, American University in Cairo
Dr. Mohamed Darwish, The American University in Cairo
Dr. Mohamed N. Abou-Zeid, The American University in Cairo
Mr. Athnasious Ghaly, American University in Cairo
Mr. Magdi Madi, The American University in Cairo
Mr. Mayer Farag, The American University in Cairo
Ms. Reem Abou Ali
Ms. Passant Youssef, American University in Cairo
Mr. Moustafa El Assaly, Mr
Abstract

The use of wood in structures has been prominent in countries around the world as wood renders many well known advantages compared to other materials used. The use of wood in structures, though common in many countries, is not common in various parts worldwide, including Egypt, due to the unavailability of sufficient information on its mechanical properties and high cost of its conjugate imported types. Thus, other cheaper options such as concrete are sought. Glauca is a local tree that is under the family of Casuarina trees; it originated in Australia and available in Egypt in abundance. This wood offers numerous advantages that includes it could be irrigated using wastewater. Recently, in a wide-scope study conducted at AUC, titled “Structural and Mechanical Properties of Egyptian Casuarina Wood” by Hussein, Moustafa M, the physical and mechanical properties of the Glauca were evaluated. The tests' results demonstrated Glauca’s prominent potential for possible structural use. This study aims at assess and explore the performance of structural local Glauca and its potential as a low cost alternative to other commonly used imported types. Within this study, a truss made of Casuarina Glauca is designed to act as the main structural element for inaccessible roofs. The work is initiated by studying different truss shapes in terms of deflection, forces in each member, buckling of members, constructability constraints and weight. The span is standardized to 12 meters for the ease of transportation. Subsequently, the truss shape that met the Strength and serviceability criteria, according to its design, and proved to be the most economic in terms of its weight is chosen. Various types of connections are  studied in terms of their strength using finite element analysis software. Then, their cost, weight and the practicality of their construction is studied. The connection that proved to be the most optimum type to deliver the study’s desired product of having a functional, cheap and good quality truss substitute is chosen.  Tests are carried out on the chosen truss, along with the chosen connection to prove that its actual performance conforms to the software’s results. Finally, material tests are conducted on the wood to study its performance when using coatings against moisture, elevated temperature and termites. The aim of these tests is to ensure the durability of the truss on the long run. The outcome of this work is a product that ensures safety, serviceability and functionality. A 1:1 scale of the truss is then constructed.