الفهرس 
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Abstract
Many reinforced concrete slabs are not only subjected to uniformly distributed load but also heavy concentrated loads. Reinforced concrete slabs are designed for concentrated loads in almost all structures such as column reactions in flat slabs, a concrete slab on a steel beam subjected to fork-lift truck loads and also the wheel load is a heavy concentrated load on a deck bridge slabs. The main objective of this thesis was to study the flexural behavior of Reinforced Concrete slabs subjected to concentrated loads. A numerical study was conducted on about 2500 simply supported and clamped reinforced concrete slabs from all four edges. The slabs were subjected to concentrated loads applied at the center of slabs on square or rectangular areas. The effect of several variables affecting the behavior of flexural members was studied such as geometry of slabs, dimensions of patch load areas, boundary conditions, and span to depth ratio. The results were compared to the reconmendations given by the Egyptian Code for RC slabs subjected to concentrated loads. Based on the results of comparison, suggested formulas, for load distribution in the two directions through the slab thickness and dispersal in plan, were suggested and tested against the FE results. Proposed equations results are illustrated and discussed briefly. Some of outcome conclusions which the results illustrate may be summarized as follows for the parametric variables used in the present study: 1- For slabs with r = b/a:S 1.5 (i.e. Two-way slabs according to the Egyptian code): a- The analysis using the code recommendations results in moments in the long directions larger than those in the short span in contrary with the results obtained from the elastic structural analysis. b- Generally, the moments obtained using the code method of analysis, have different values than those obtained from the elastic analysis by SAP. 2- For slabs with b/a 1.5 one-way slabs according to the Egyptian code): a- High values of positive moments in the long direction were obtained from FE analysis in contrary with the values of moments obtained from the Egyptian code method of analysis which results in zero moments in the long direction of one-way slabs. Accordingly, the code recommendations of the 1 A’ 2 reinforcement in the long span: is suggested to be increased to 3 As A~ > ~ As - 3’ b- The value of load dispersal in the long direction, according to the Egyptian Code, depends on short span and ratio of reinforcement in the two directions. The present results show the dependence of this value on the dimensions of the patch loading also. Therefore, it is suggested that any formula considering the load dispersal in the long direction of One-way slab should consider the dimensions of the patch loading.