الفهرس | Only 14 pages are availabe for public view |
Abstract The main aim of this research is to study the linear and nonlinear behavior of the space trusses under the effect of fire. The research was carried out into several phases: First phase, an experimental test on a space truss model was carried out to study the behavior of the space trusses under normal conditions and under the effect of fire load. A comparison between the two tests was held to show the effect of the increase in temperature on the overall behavior and the stiffness of the truss. The second phase of this research focused on the numerical behavior of the tested space truss model. Numerical model using ANSYS, 2012 software was employed to assure the results obtained from the experimental test of the space truss. F.E. analysis was performed using two different models. A comparison between the experimental test and the numerical analysis was presented. As well as, a comparison between the two models used in the finite element analysis was held. The results showed a good agreement between the experiment and the F.E. analysis. The finite element analysis using the first model showed a reasonable results that are consistent with the experimental results. The third phase was a numerical study on previously published space trusses to show the effect of the temperature increase on the nonlinear behavior of the space truss. In this phase: models for El-Sheikh and Mezzina were studied by subjecting the lower joints of these trusses to an increase in temperatures. Moreover, the results obtained from the current research were compared by the results obtained by El-Sheikh and Mezzina under normal operations. |