massa’a extension | feature stories 1 2 3 4 5 Reduced dimension of concrete High strength concrete of up to 75 MPa cylinder compressive strength (over 28 days to attain reduced dimensions) was successfully utilized in columns, and prestressed precast girders to achieve the desired architectural form. Escalator buildings Four escalator buildings - two at Marwa, one at Safa, and one at the Fatah Gate - will serve all Massa’a floors. Their substructure under the Massa’a and the Marwa is a raft foundation. The Safa escalator is on an isolated/ combined footing because of high bearing capacity estimates based on the geotechnical investigation. opposite page Safa framing plan 1 Old plan 2 New plan 3 Radial precast pre-stressed beams supported on an internal ring beam and external polygonal beams, Safa 4 The two-mezzanine floor during construction of Safa with supporting steel-tie elements hung from overlying radial beams 5 Completed structure features ornamental ceilings, Safa 09