LIMIT STRENGTH AND SERVICEABILITY FACTORS IN UNIFORMLY LOADED, ISOTROPICALLY REINFORCED TWO-WAY SLABS

CRITERIA ARE PROPOSED FOR PREDICTING THE LIMIT STRENGTH OF UNIFORMLY LOADED, TWO-WAY ACTION, STRUCTURAL SLABS AND PLATES OF VARIOUS BOUNDARY CONDITIONS, TAKING INTO ACCOUNT THE COMPRESSIVE MEMBRANE EFFECT AT LARGE DEFLECTIONS. ALSO A SERVICEABILITY FACTORS CONCEPT IS PROPOSED FOR USE IN CONJUNCTION WITH LIMIT STRENGTH DESIGN OF THE SLABS. TWENTY-NINE ISOTROPICALLY REINFORCED SLABS IN THREE MAJOR SERIES WERE TESTED TO FAILURE. THEIR CLEAR SPAN DIMENSIONS WERE VARIED. BOUNDARY CONDITIONS VARIED FROM RESTRAINED TO HINGED. TOTAL THICKNESS OF THE SLAB MODELS TESTED WAS 2 1/2 IN (6.35 CM), AND THE EFFECTIVE DEPTH WAS GENERALLY 2 IN (5.08 CM) APPROXIMATELY. THE ASPECT RATIO FOR THE TESTED SLABS HAD A VALUE OF 26.0 FOR THE SQUARE SLABS AND 18.8 FOR THE RECTANGULAR SLABS. THE INVESTIGATION SHOWED THAT THE MEAN OF THE RATIOS OF THE PREDICTED LIMIT STRENGTH USING THE DEVELOPED EQUATION TO THE MEASURED FAILURE LOAD WAS 0.76, WITH THE RATIO BEING CLOSE TO 1.0 IN SLABS RESTRAINED ON ALL EDGES. THIS CLOSE PREDICTION IS COMPARED WITH THE MEAN VALUE OF THE MEASURED ULTIMATE LOAD. SERVICEABILITY FACTORS RANGED BETWEEN VALUES OF 3 AND 5 USING, AS A CRITERION, A LIMITING SERVICE LOAD DEFLECTION TO SPAN RATIO OF 1/360. /ACI/

  • Authors:
    • Hung, T Y
    • Nawy, E G
  • Publication Date: 1972-1

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  • Accession Number: 00209677
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 9 1972 12:00AM