Objective
THE TARGET OF THE PROJECT IS TO FIND DURATION FACTORS FOR STRUCTURAL
TIMBER WITH "DEFECTS"DEFINED BY DESCRIPTION (TYPE AND SIZE) OR BY INFLUENCE ON LOCAL STIFFNESS, AND TO VERIFY A POSSIBLE GRADE EFFECT AS WELL AS VARIATIONS WITHIN GRADE DEPENDING ON DIFFERENT COMBINATIONS OF DEFECTS.
THE DURATION FACTOR IS THE RATIO OF THE STRESS CAUSING FAILURE AFTER A GIVEN TIME TO THE STRESS CAUSING FAILURE AT STANDARD SHORT-TERM TESTING. THE SHORT-TERM STRENGTH HAS TO BE PREDICTED BY TESTING MATCHED SPECIMENS.
THE SUCCESS OF THE PROJECT ALL DEPENDS ON PAIR-MATCHING OF DEFECTS.
TWO METHODS WILL BE USED WITH REFERENCE TO KNOTS: THE SYMMETRICALLY-CUT-KNOT-METHOD (SCK-METHOD) AND THE EQUAL-KNOTS-METHOD (EK-METHOD).
THE PROCEDURE AT THE SCK-METHOD IS TO MAKE A CUR IN ALOG THROUGH THE PITCH AND THROUGH A KNOT OF SELECTED SIZE WITH SUCH PRECISION THAT THE KNOT IS CUT IN TWO EQUAL HALVES. THE PRINCIPLE OF THE EK-METHOD IS TO FIND TWO KNOTS OF THE SAME DIAMETER IN THE SAME LOG, THEN TWO SPECIMENS MUST BE CUT SO THAT KNOTS ARE EQUALLY LOCALIZED IN THE CROSS SECTION.
ONE PROBLEM WITH BOTH THE SCK-METHOD AND EK-METHOD IS THAT ADJACENT KNOTS WILL DISTURB THE MATCHING. THIS WILL BE ELIMINATED IN TWO WAYS:ONE IS FINGER JOINTING, THE OTHER IS "LAMINATION".
ACCORDING TO PRESENT PLANNING THE PRINCIPAL LONG-TERM LOADING WILL TAKE PLACE IN A ROCK-SHELTER WITH SUFFICIENT SPACE FOR DIRECT LOADING OF HORIZONTAL SPECIMENS. A STANDARD SPAN 18 H WILL BE USED. THE LAYOUT WILL MAKE IT POSSIBLE TO KEEP 100 SPECIMENS UNDER LOAD. TIME TO FAILURE, AND FOR SOME SPECIMENS POSSIBLY THE CREEP, WILL BE RECORDED. RELATIVE HUMIDITY AND TEMPERATURE WILL BE RECORDED AS WELL.
THE RELATIVE HUMIDITY AT THE LONG-TERM LOADING SHOULD STAY WITHIN RH 0.65 AND RH 0.75. SUPPLEMENTARY TESTING OF A SMALLER NUMBER WILL BE CARRIED OUT IN A CLIMATE CHAMBER UNDER CONTROLLED CYCLING CLIMATE.
Fields of science (EuroSciVoc)
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Programme(s)
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Multi-annual funding programmes that define the EU’s priorities for research and innovation.
Topic(s)
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Calls for proposals are divided into topics. A topic defines a specific subject or area for which applicants can submit proposals. The description of a topic comprises its specific scope and the expected impact of the funded project.
Call for proposal
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Procedure for inviting applicants to submit project proposals, with the aim of receiving EU funding.
Funding Scheme
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Coordinator
86 STOCKHOLM
Sweden
The total costs incurred by this organisation to participate in the project, including direct and indirect costs. This amount is a subset of the overall project budget.