A model analysis of flat slabs.
|Title:||A model analysis of flat slabs.|
|Authors:||Faltaous, E. Bahaa.|
|Abstract:||A two-storey 3 bay x 3 bay, 1/12 scale, perspex flat slab model was tested under a one-bay uniformly distributed load, which was applied successively to the various bays. The load was applied using a rubber air bag. The moments induced in the model were measured by electrical resistance type strain gages and the deflections by dial gages. By analysis of the experimental results, and comparing them with the ACI 318-71 Direct Design Method, the following conclusions were obtained: The total static moment given by the ACI 318-71 Direct Design Method is accurate for all practical purposes. The width of the column strip specified by the ACI Code in Clause 13.1.2 of 0.25 ℓ2 but not greater than 0.25 ℓ1 results in too great a concentration of negative moment in the column strip. This concentration of moment in the column strip is even less justified for the positive moment where the column strip moment/unit width and the middle strip moments/unit width are of approximately equal magnitude. The effect of the concentration of positive moment in the column strip together with aforementioned restriction of the width of the column strip results in middle strip design positive moments 25% less than those measured. The provision "188.8.131.52" that a design moment may be adjusted by up to 10% provided that the total static moment is not less than required should be changed by eliminating the 10% limit. It is recommended that adjustment be applied to the negative moment only. The provisions for the effects of pattern loading "13.3.6" are insufficient. The limitation of live load to dead load ratios stated in "184.108.40.206" results in a possibility of developing negative moments in or near mid span of interior panels.|
|Collection||Thèses, 1910 - 2010 // Theses, 1910 - 2010|