How High Could Buildings Made Of Ribbed Or Flat Slab Construction With Out Shear Walls Be Built (case Study)

The main objective of this thesis was to study the stability of slab-column, specificallyrnribbed slab-column, for high rising building frame systems with out lateral load resistingrnstructural element. The study also tried to answer the question how the stability ofrnribbed slab column frames without lateral load resisting structural element determinesrnthe limit of the story number which can be built using ribbed slab column frame systemrnin Addis Ababa and other seismic areas in Ethiopia.rnComputer aided analysis based on 3-dimensional model consisting reduced column andrnribbed beam stiffness for case of ACI and unreduced stiffness for case of EBCS wasrnused in the determination of stability index of a story. This can be applied for variousrncategories of building frame and structural element sizes to carry out the study ofrnstability.rnThe selection of a building configuration is one of the most important aspects of thernoverall design; it is influenced primarily by the intended function, architecturalrnconsiderations, internal traffic flow, building height, aspect ratio and to a lesser extentrnthe intensity of loading. In this study, buildings are categorized as commercial (shopsrnand market complex), office and apartment buildings. The arrangement or grid spacingrnfor structural element is compatible with the international standards given from Time-rnSavers standards for building types and Neufert (architects’ data).rnThe study showed that the stability index or moment ratio of a frame system should notrnbe greater than 0.25 according to EBCS-8 1995 and 0.3 for ACI building code standard,rnbut the building systems which were described in this thesis work have a value which isrnmuch greater than this value for eight story and above .rnThe serviceability limit of a story is not satisfied in most analyzed ribbed slab framernsystems. Therefore, the ribbed slab column frame systems are designed for gravity load,rnand for deformation compatibility lateral force resisting structural element should bern9rnused to ensure that the system can maintain the required serviceability and ultimate limitrnstate specified on EBCS and ACI code of practice.

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