M00017816
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ISO DIS 4355 2013 Edition, February 21, 2013 BASES FOR DESIGN OF STRUCTURES - DETERMINATION OF SNOW LOADS ON ROOFS
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Availability date: 07/14/2021
Description / Abstract:
This International Standard specifies methods for the
determination of snow load on roofs.
It may serve as a basis for the development of national codes
for the determination of snow load on roofs.
National codes should supply statistical data of the snow load
on ground in the form of zone maps, tables or formulae.
The shape coefficients presented in this International Standard
are prepared for design application, and may thus be directly
adopted for use in national codes, unless justification for other
values is available.
For determining the snow loads on roofs of unusual shapes or
shapes not covered by this International Standard or in national
standards, it is recommended that special studies should be
undertaken. These may include testing of scale models in a wind
tunnel or water flume, especially equipped for reproducing
accumulation phenomena, and should include methods of accounting
for the local meteorological statistics. Examples of numerical
methods, scale model studies and accompanying statistical analysis
methods are described in Annex G.
The annexes describing methods for determining the
characteristic snow load on the ground, exposure coefficient,
thermal coefficient and loads on snow fences are for information
only as a consequence of the limited amount of documentation and
available scientific results.
In some regions, single winters with unusual weather conditions
may cause severe load conditions not taken into account by this
International Standard.
Specification of standard procedures and instrumentation for
measurements is not dealt with in this International Standard.