Tall Building case studies - Tall Buildings: Structural Systems and Aerodynamic Form - page 110

Composite mega column
(2.4><3m at the bottom, ABCD core

1.6x2m at the top) shear truss

Steel outrigger
y / > i v

A B

s w c4
(N

S wo w ■'S-

p

D b 22.5m

1 r

45.5m
-5 1.5m

Outrigger application

Floor 42

Floor 42

Floor 35

p- wo I

wo
l

Floor 10

~46.5m ~57m

(63.5m at the ground floor)

63.5m

Floor 35 Floor 10

Figure 4.13 Taipei 101 schematic section and plans

The Taipei 101 is an example of a building with setbacks and an aerodynamic
building top ( Section 6.1 ) . In addition, the application of the saw-tooth corner, a
development of the recessed corner, to the building significantly reduces wind loads
on the building, compared with a sharp corner and reduces wind induced base
moment by 25 per cent ( Section 6.1 ). In the design of the Taipei 101 structural system,
resistance against the wind, which is estimated to be capable of reaching a speed of
43.3 m/s (156km/h), was an important design input.
The 8 perimeter columns and 16 core columns, all composite, consist of
box-section steel filled with high-strength concrete (70 MPa). At the ground floor the
perimeter columns have dimensions of 2.4×3 m. The perimeter and core columns
are connected by outriggers, 1 or 2 storeys deep, at 10 levels along the height of the
building ( Figure 4.13 ).
The Taipei 101 has a lateral drift limit ratio of 1/200 of its height and a 730-ton
tuned mass damper (TMD) was used near the top of the building (between the 87th
and 92nd floors) ( Figure 6.19 ).