Analytical Study between Flat and Hollow Block Slabs in Sudan

Abstract

In this study, one of a structural member which called slabs are studied as general and in particular, one of these types hollow block and flat slab are investigated as a structural system. These structural systems are methods of construction for flooring system which are used in Sudan, and this research is covering the analysis and design of hollow block and flat slab using Safe program according to British code (BS 8110-1997). The results of analysis and design are compared together to find the best system and cost-effectiveness. The methodology comprises of the method and the design that was used to conduct the case studied and explain the way of analysis and design of hollow block and flat slab for a residential building in Sudan. There were two models with variable plan areas (13mí—23m) and (14mí—23m) analyzed and designed according to British code 8110. The result obtained from the study shows that the hollow block slab has a lightweight and zero punching shear making it more preferable choice for residential building. Considering from the economical point of view it is less expensive than that of the flat slab using hollow concrete block; hence the total quantity of steel reinforcement and concrete used is less. In model 1 for the cost of materials and the total cost increased for the flat slab is (27.31% - 21.54%) and on other hand In model 2 for the cost of materials and the total cost increased for the flat slab is (35.63% - 29.17%).To conclude, hollow block slab is the best alternative method in frame structures due to its capability to reduce the self-weight of the slab then the cost especially in long spans and have a good overall behavior in hot countries like Sudan.