This research related to the duration of load effect on
curved glulam is a part of an EC-AIR project carried out
at VTT in co-operation with four other EU member
The project includes the long term loading of 32 curved
beams, as well as equivalent short term reference tests
of 32 beams. The long term loading was made under both
constant and cyclically varying humidity conditions.
Failure is caused by tensile stress perpendicular to
A calculation procedure is presented to consider the
effect of moisture variation as an additional loading.
Both calculation and experiments reveal that a period of
higher humidity can double the effective loading,
depending on the duration of humid period.
Experimental and calculated results are given for
duration of load effect of curved glulam for two
thicknesses (90 and 140 mm) under constant (85%) and
cyclically changing humidity.
|Place of Publication||Espoo|
|Publisher||VTT Technical Research Centre of Finland|
|Number of pages||104|
|Publication status||Published - 1998|
|MoE publication type||Not Eligible|
- wooden structures
- structural timber
- glulam beams
- loads (forces)
- life (durability)