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  • lazar
    Participant
      May 17, 2009 at 5:11 pm #2970
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      what is the allowable deviation in a single end stressed slab in percentage and also in double live end in pt slab that is + or – 10% what is the criteria or standard calculation.

      lazar
      Participant
      Posts: 31
        May 23, 2009 at 2:53 pm #3231
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        the allowable deviation as per ACI is + or -7%.. if i'm not mistaken…plesase refer to ACI code…

        Decipher
        Participant
        Posts: 46
          May 26, 2009 at 2:03 pm #3241
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          As per AS (Australian standards) 3600-2001, A check shall be made for each tendon, on the correlation between measured extension & the calculated extension derived from the prestressing force,using the load elongation curves for the tendons & assumed friction values for the cable.Any disparity between the two figures greater than 10% of the calculated extension shall be investigated. means Variation between Actual elongation and theortical elongation must not be more than+ or – 10%.

          Administrator
          Keymaster
          Posts: 66
            May 27, 2009 at 6:05 am #3243
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            as per BSI is +/- 6%
            extracted part attached

            [img:width=680&height=332]{e_FILE}public/1243403576_1_FT211_extract_from_bsi_8110-1-1997.jpg[/img]

            @loida wrote:

            the allowable deviation as per ACI is + or -7%.. if i'm not mistaken…plesase refer to ACI code…

            Correct. you are not mistaken
            as per ACI is 5% for pretensioned and 7% for post tensioned
            the extracted part attached from ACI is: ACI 318M, chapter 18.18.1

            [img:width=584&height=458]{e_FILE}public/1243403576_1_FT211_aci-318m.jpg[/img]

            All of the mentioned in this topic are correct, Australian Code +/-10 % or BSI +/-6 % or ACI +/-7 % all depend which code your authority follow.