An-Najah Staff

Analysis of two- way ribbed and waffle slabs with hidden beams 

This paper focuses on analysis of two-way ribbed and waffle slabs with hidden beams. There are many methods that are used to analyze two-way slabs and the precision of these methods vary depending on method assumptions. In this study, the ACI direct design method is used as  a  manual  or  hand  method  of  calculation  and  the  solution  will  be  compared  with  the analysis  results  of  the  three  dimensional  structural model  done  by  the  computer  program Sap2000. The moments in beams, slab column strip and slab middle strip will be determined. It will  be  illustrated  that  the  distribution  of moments  in  two-way  slabs with  hidden  beams likes the distribution of moments in slabs without beams as the stiffness of the hidden beams is small. It is recommended that the use of three dimensional modeling by computer software is the best solution for moment’s determination and distribution.