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Title |
Tension Stiffening Effect Considering Cover Thickness in Reinforced Concrete Tension Members
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Keywords |
피복두께 ; 균열간격 ; 직접인장부재 ; 쪼갬균열 ; 인장증강 cover thickness ; crack spacing ; direct tensile member ; splitting crack ; tension stiffening |
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Abstract |
This paper presents the test results of 12 direct tensile specimens to investigate the effect of cover thickness on the tension stiffening behavior in axially loaded reinforced concrete tensile members. Six concrete cover thickness ratios are selected as a main experimental parameter. The results showed that, as cover thickness became thinner, more extensive split cracking along the reinforcement occurred and transverse crack spacing became smaller, making the effective tensile stiffness of thin specimens at the stabilized cracking stage to be much smaller than that of thick specimens. This observation is not implemented in the current design provisions, in which the significant reduction of tension stiffening effect can be achieved by applying thinner cover thickness. Based on the present results, a modified tension stiffening factor is proposed to account for the effect of the cover thickness.
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