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Zekirija Idrizi1 and Isak Idrizi2


1. Faculty of Civil Engineering and Architecture, Hasan Prishtina University, Prishinë 10000, Kosova;
2. Faculty of Civil Engineering and Architecture, Mother Teresa University, Shkup 1000, Macedonia


In order to maximize the return of investments and at the same time improve the quality in the construction industry of midrise buildings, it is very important to derive an optimal solution to the building structural system, which would facilitate faster and easier construction activities with minimal quantity of construction material, while maintaining the satisfactory level of building safety and performance. This paper makes a comparative study between a “solid” and a “waffle” slab system. A typical 14-story RC building structure is selected as an example for this study purpose. The first part of this study is focused in deriving an optimal solution for a solid and waffle slab system which are later on considered as constituents of all stories of the 14-story building. In the second part, it is elaborated the effect of both slab systems over the 14-story building model. This study aims to emphasize the advantages of mid-rise buildings constituted of waffle slab system over the buildings characterized with solid types of slabs, in terms of economy, structural safety and performance.


Waffle slab, solid slab, RC structure, optimization, seismic analysis and design.

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