CMC General Hospital

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Architect :Meskerem Tamiru
Client: Ato Tena Kebede(NECAT Engineering College)
Location: CMC, Addis Ababa, Ethiopia
Involvement of AEE: Complete Structural
Design Status: Under Construction

 

 

 

This is a B+G+6 hospital building with a flat slab system. There are shear walls as major lateral force resisting elements, besides columns. The underlying soil is a back fill to a depth of about 5.5m. Hence, based on the soil investigation report and our optimization efforts, the foundations is made from a combination of mat, isolated, strip and combined footings. We believe in engineering optimization. Therefore, some of the considered solutions include: beam-solid slab combination, ribbed slab, pile foundation, mat foundation with thickening at column bases and box mat system. Since the building is meant for hospital and since it is expected to have VIP rooms as well, it is given the highest importance level for earthquake design according to Ethiopian Building Code Standard 8, 1995.Making the building as light as possible, not only makes the vertical load resisting elements optimal, but also essentially decrease the amount of earthquake force expected in the system. This is accomplished by employing punching reinforcement (through the use of international codes) in the flats lab system, so that the slab depth is kept to a minimum.Particular details that make the structure ductile are used so that the energy from earthquake is better dissipated. Furthermore, the irregular fancy shape(‘L’ in plan) is separated by an expansion joint so that the two wings of the building act independently from each other in case of earthquakes. Moreover,the shear wall arrangement was so coordinated with architectural walls that the shear or stiffness center is positioned very close to the mass center. As aninertial force, earthquake acts through the mass center of a structure. When this happens, our building will experience minimum story torsion and is thus better behaved against earthquakes.

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