Indirect base plate fixings will not meet the new code requirment
due to the very concept that they rely on a sleeve or a spreading
mechanism, or in some cases just a through bolt connecting a welded
T base plate to a SHS. The code (Structural design actions
- Permanent, imposed and other actions and supplement - Commentary
AS/NZS 1170.2 Supp 1:2002) multiplied the force criteria
by nearly 4 x factor. How then could it be expected that an indirect
base plate connection satisfy any specifier's concious? We see
it time and again on new works (post Sept 2002) where this type
of installation is being done. You are legally responsible for
making such a decision.
Note: There are harsh penalties enforceable on an Architect,
Engineer, Builder and the Foreman/ Project Manager if it is proven
that they were advised or should be aware of the compliance requirements
of the code and that they did not investigate the legitamacy of
a tenderers claim of compliance.
Nowadays a new design drawn up by an Architect who wants a certain
look must be put to prototype manufacture and then be tested for
structural integrity using the same installation practice and
procedure as that specified on site. Unscupulous contractors may
manipulate the tests, use a higher grade material or build internal
strenghening to pass.
You must choose a high integrity balustrade that meets the code
and satisfies your conscience, people could die as a result of
the decision you make on behalf of your Company to save a few
dollars.
The Millenium Balustrade Aluminium Post for example weighs 2.45KG
per metre, compare that to a standard square post of a lower Alloy
Grade of similar 50 x 50 size weighs 1.29 KG and has not tensile
properties nor is their any integrated fixing method of attaching
top rails, glass or bottom rails.
Glass patches will not satisfy the point load requiremnt test
intended to emulate impact of a person coming in contatct with
the balustrade. Would you feel safe to see your children playing
at the balcony edge of a 10 storey apartment with 4 small 70 x
70 mm clamps holding a piece of glass as the only means of fall
arrest?
