Civil Engineering Reference
In-Depth Information
q
y
=-28.0×sin50°=-21.45 kN/m,
representing a total horizontal load of
F
=—672 kN, whose components are
F
x
=432kN
and
F
y
=-514.8 kN.
Fig. 6.1
8-storey building for the example, a) Bracing shear wall, b) 'Layout 1'.
6.1 CASE 1
In the first arrangement ('Layout 1') all four walls are placed in the right-hand side of the
building (Fig. 6.1/b). The second moments of area of the shear walls are given in Fig. 6.1/a.
As the equivalent column is situated concurrent with the shear centre, the first step
is to locate the shear centre. Its coordinates are obtained from formulae (5.96) which
are simplified versions of formulae (2.1) and (2.2) when
I
xy
=0 holds:
Structural engineering common sense also predicts this result as the centre of stiffness
of the four shear walls in the doubly symmetrical arrangement is at the geometrical
centre of the wall system. The geometrical and stiffness characteristics needed for the
