| Abstrakt: |
Abstract: Many forms of shells are available for use as foundations. Then frustum of a cone in the upright position can serve as footing for columns or raft for structure such as chimneys. Reactive Powder Concrete (RPC) is an ultra - high strength, low porosity material with high cement and silica fume contents and steel fibers. The present study aims at studying the RPC as a material used to construct RPC shell foundations. A com plete load - frame assembly was designed and fabricated for experimental work. Experimental tests are conducted to study the effect of steel fiber volumetric ratio (V f ), silica fume content (S f ), change eccentricity, and rise of shell to radius of base rati o (f/r 2 ) on the behavior of conical shell foundations. Results of tests conducted on wire - reinforced small - concrete models of conical foundations under loads established substantially high values of load factors involved in the traditional design of th e conical foundations by membrane theory. The increased ratio of height to radius (f/r 2 ) for the shell foundation from 0.25 to 0.75 increases the ultimate load of footing by about 15 %. The conical shell footing can admirably resist smaller values of accid ental eccentricities of load (due to unanticipated moment) that may occur in practice. |
