Tall Building case studies - Tall Buildings: Structural Systems and Aerodynamic Form - page 118

Figure 4.20 The Petronas Twin Towers skybridge

deep at midspan and 117 cm deep at column faces. For additional stiffness, reinforced
concrete core shear walls and perimeter columns are connected to each other by
2-storey-deep outriggers at the 38th floor (floors 38-40 - at almost mid-height of the
structure), which is a mechanical equipment floor ( Figure 4.21 ) .
High-strength concrete was used in the building, 80 MPa in the lower floors,
60 MPa in the middle floors and 40 MPa in the upper floors.
The Petronas Twin Towers' composite floor slabs, supported by wide-flange beams,
consist of 5.1 cm deep trapezoidal metal deck covered with a layer of reinforced
concrete with a thickness of 11.4 cm in the office floors and 20.3 cm at the mechanical
equipment floors ( Figure 4.21 ) .

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