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| An improved formula for cracking moment calculation of RC beams considering the development coefficient of plastic deformations |
| Received:April 28, 2018 Revised:June 01, 2018 |
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| DOI：10.7511/jslx20180428001 |
| KeyWord:cracking moments RC beams concrete strength plastic deformation development coefficient influence coefficient of plasticity improved calculation formula |
| Author | Institution |
| 方圣恩 |
福州大学 土木工程学院, 福州 ;福州大学 土木工程防震减灾信息化国家地方联合工程研究中心, 福州 |
| 张培辉 |
福州大学 土木工程学院, 福州 |
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| Abstract: |
| In view of the lack of a general method for calculating the cracking loads of RC beams,6 different formulas for calculating cracking moments were first compared using 18 experimental RC beams.The results showed that the deviations between the calculated and experimental cracking moments were related to the concrete strength.Then a new concept of plastic deformation development coefficient,k,was proposed in order to derive a new cracking moment formula.The formula was further improved based on k and the influence coefficient of plasticity γk related to k.The recommended values of k and γk were given according to the concrete strength.Lastly,12 experimental RC beams were used to verify the accuracy of the improved formula.It was found that the estimations by the improved formula agreed well with the experimental measurements and was more conservative than the existing formulas. |