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• W2181355030 abstract "Some researchers proposed different analytical methods for presenting boundary conditions, and stiffeners effect in analytical solutions of folded plate slabs. This study investigates the effect of each of these factors to review the previous approximations range of validity for longer spans Quadratic Folded Plate (Q.F.P) slabs. The chosen elements are: Stiffness of end diaphragms, intermediate beams stiffness, and folded plates rise (height). Besides, the effectiveness of increasing the folded plates' thickness on the structural behavior of the system was investigated as well. Hence, the impact of such variance on the static and dynamic behavior of the system is studied. All previous parameters were applied on systems with three different spans 14, 20 and 26 meters. In order to achieve the previous objectives, 3-D Finite Elements Models (F.E.M) were adopted.to perform linear static analysis on the investigated systems, and the effect of each of the above mentioned parameters on deflections and stresses was studied and analyzed. The studied Q,F,P. rises varied from 90 cm to 180 cm. This doubling of rise reduced the roof deflection by 60% Increasing Q.F.P slab thickness from 8 to 12 cm limited this reduction in deflection to 15%. Stiffness of intermediate beams was another investigated factor, its original stiffness was increased up to six time. Tripling the intermediate beams original stiffness resulted in reducing slabs deflections by 17%. These parameters resulted in a similar trend in reduction of intermediate beams bending moments. As for reduction in end diaphragm bending moments due to changing Q.F.P rise, it reached 40% decrease on increasing the rise from 90 to 180 cm. Three Dimensional dynamic modal analyses were performed as well. The effect of different diaphragms, intermediate beams, and spans on the fundamental modes was investigated. From modal analysis, it was concluded that increasing the span from 14 to 20 meters did not have significant effect on the fundamental frequencies. On the other hand the 26 meters natural frequencies were lower by 27% from both spans. Increasing the roof rise from 90 to 180 cm increased the natural frequencies by 25%, this can be attributed to the increase in the stiffness of the system. Finally, the obtained results confirmed on the diffiecency in design that can result from approximate end conditions, or neglecting stiffners effect in analytical modeling, especially for Q.F.P. slabs with long spans. Consequently, elaborate numerical analysis is recommended in dealing with longer spans Q.F.P systems, as the geometric properties of each contributing element had obvious effect on the overall performance of the system. It is also concluded that folded plate rise is the most effective in the investigated parameters, while difference in folded plate thickness had the lowest effect on both static and dynamic behavior of the investigated system. (Journal of American Science 2010;6(7):318-326). (ISSN: 1545-1003)." @default.
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• W2181355030 date "2010-01-01" @default.
• W2181355030 modified "2023-09-27" @default.
• W2181355030 title "Effect of Geometric Configuration of Quadratic Folded Plate Roofing Systems on Their Static and Dynamic Behavior ." @default.
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