BUCKLING AND SUPPORT BEHAVIOUR OF UNIAXIALLY COMPRESSED PLATES

BEUL- UND TRAGLASTVERHALTEN EINACHSIG GEDRUECKTER BLECHE

THE LOAD BEHAVIOUR IN RELATION TO ALPHA IS TO BE ESTABLISHED ON UNIAXIALLY PRESSURE STRESSED ISOTROPIC RECTANGULAR PLATES WITH LATERAL RATIO ALPHA = A/B <=1. WITH DIMINISHING LATERAL RATIO ALPHA THE BEHAVIOUR OF THE PLATE ACTUALLY APPROACHES THAT OF THE GIRDER. SINCE, FOR GIRDERS WHICH POSSESS PRACTICALLY NO ABOVE-CRITICAL LOAD CAPACITY, GREATER SAFETY WITH RESPECT TO THE BRANCH LOAD MUST BE DEMANDED THAN FOR PLATES WHERE ALPHA >=1, IT IS NECESSARY FOR PLATES WITH LATERAL RATIOS ALPHA >=1 THAT A CONVERSION IN THE REQUIRED SAFETY FROM THE PLATE TO THE GIRDER BE ESTABLISHED. THIS CONVERSION IS LACKING UP TO NOW IN DIN 4114. THE OBJECT OF THE TESTS IS TO OBTAIN PRACTICAL INFORMATION FOR ESTABLISHING THE NECESSARY SAFETY IN THIS CONVERSION RANGE. SINCE FIRSTLY ONLY TESTS ON METAL PLATES WITH A CONSTANT WIDTH-THICKNESS RATIO ARE CONSIDERED HERE, SOME SUPPLEMENTARY TESTS ARE NECESSARY.