A research study on the long term load effects of Kerto
laminated veneer lumber (LVL) was carried out at VTT in
co-operation with other partners of a European project.
Before the start of the long term tests, short term
reference tests on Kerto LVL beams were completed
(Fonselius and Ranta-Maunus 1996). The selection of load
levels for the long term tests were determined based on
the short term strength results.
The results of long term bending experiments made by VTT
are published in this report. A total of 40 LVL beams
were loaded under long duration loading. Nearly
structural size beams were loaded to failure under
monthly increasing stepwise loading under controlled
humidity conditions, including both constant (85 % RH)
and cyclic humidity.
The bending stress at failure when extrapolated to 6
months load duration was 67 to 75 % of the short term
strength of similar beams having the same moisture
content, which is equal or better than predicted by
Madison curve (67 %).
|Place of Publication||Espoo|
|Publisher||VTT Technical Research Centre of Finland|
|Number of pages||64|
|ISBN (Print)||951-38-5290-3, 951-38-5291-1|
|Publication status||Published - 1998|
|MoE publication type||Not Eligible|
|Series||VTT Tiedotteita - Meddelanden - Research Notes|
- structural timber
- laminated wood
- life (durability)
- laminated veneer lumber
- loads (forces)
- bending tests