Civil Engineering Reference
In-Depth Information
integrated into the wall construction achieve a flush internal
finish benefiting internal space planning and rents based on
net floor area as shown in
Figures 18.4
,
18.5
,
18.6
,
18.8
and
18.9
.
Flush concrete soffits have become more popular and while
steel columns can be integrated into concrete flat slabs to useful
effect as shown in
Figures 18.7(a, b)
it would be more usual
to use slimflor construction as a competing solution to
in situ
concrete albeit with bottom steel flanges visible, as shown in
Figures 18.10(a,b)
and
18.11
.
Hybrid buildings require the designer to manage the
design and detail interfaces of dissimilar materials some-
times involving different contractors. Familiarity with
general building construction, appreciation of structural
design parameters and frame connection detailing, and an
appreciation of overall stability and the interfaces of design
responsibility are needed.
It is worth noting a designer's responsibility for overall sta-
bility as defined in the UK structural codes. CL 2.1.1.2 from BS
5950-2000 states:
Figure 18.3
At concept stage, avoid multiple member junctions
There is an increased demand for mixed use and naturally
ventilated buildings. Often hybrid structural combinations
that exploit particular characteristics of the structural mater-
ial are used as shown in
Figures 18.7(a,b)
,
18.9
,
18.10(a,b)
and
18.11
.
Steel internal columns are compact relative to concrete col-
umns and can be used to maximise internal usable space if com-
pact column casings are used. On perimeters, steel columns
Overall stability: The designer who is responsible for the
overall stability of the structure should be clearly identified.
This designer should ensure the compatibility of the structural
design and detailing between all those structural parts and
components that are required for overall stability, even if some
or all of the structural design and detailing of those structural
parts and components is carried out by another designer.
CURTAIN WALLING/
GLAZING SYSTEM SPEC
H11
PLASTERBOARD DRI-WALL
SPEC K10/125
Inside
20
Outside
ALUMINIUM AEROFOIL
SECTION PROFILE
H11 130
RESTRAINT ANCHORS
SPEC F30/250
NATURAL STONE
WALLING/DRESSINGS
SPEC F21
Figure 18.4
Plan of twin perimeter columns set into the wall construction, galvanised as they are in contact with the concrete cladding
