Objective
IN CONTINUATION OF EARLIER RESEARCH, TENSION JOINTS WITH NAILS, CLAWPLATES (BULLDOG) AND WITH SPLIT-RINGS, WITH SHORT-DURATION STRENGTH OF ABOUT 40KN, WILL BE LOADED TO E.G. 50%, 40% AND 30% OF THAT STRENGTH.
AFTER CERTAIN LOADING PERIODS THEY WILL BE UNLOADED AND THE REMAINING STRENGTH MEASURED BY A STANDARD SHORT-DURATION TEST.
THE LONG-DURATION TEST WILL BE LOADED IN A NON-CLIMATISED LABORATORY HALL.
DURING THESE TESTS THE (CREEP-)DEFORMATIONS WILL BE MEASURED.
AFTER A LOADING PERIOD OF ABOUT 2 TO 2.5 YEARS A FIRST PART OF THE JOINTS WILL BE UNLOADED AND THE REMAINING STRENGTH MEASURED. THIS WILL START WITH THE HIGHEST LOAD LEVEL. IF NO STRENGTH DECREASE CAN BE DETERMINED, NO FURTHER TESTS WILL BE DONE, BUT THE LOWEST-LOADED SPECIMENS WILL BE UPLOADED TO THE HIGHEST LEVEL (30%-LEVEL TO 50%-LEVEL; IF THE 50%-LEVEL TEST SPECIMENS DO NOT SHOW A MEASURABLE LOSS OF STRENGTH, THESE 30%-LEVEL SPECIMENS SURELY WILL NOT SHOW SUCH A LOSS).
AFTER 5 YEARS THE PROCEDURE WILL BE REPEATED, AND IF NO STRENGTH REDUCTION IS DEMONSTRATED THE TEST WILL BE CONTINUED. DEPENDENT ON THE RESULTS THIS PROCEDURE WILL BE CONTINUED.
THE PROGRAM WILL START WITH ISO TEST SPECIMENS (WHICH CAN BE LOADED IN A PERIOD OF ABOUT 2 TO 2.5 MONTHS BECAUSE OF THE MANY READINGS OF DEFORMATIONS TO BE DONE) AND EACH TIME THAT SPECIMENS ARE UNLOADED FOR SHORT DURATION TESTING, NEW JOINTS WILL BE INSTALLED, SO THAT AT LEAST 180 JOINTS WILL BE TESTED.
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2600 GA DELFT
Netherlands