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首页> 外文会议>Structural Implications of Shrinkage and Creep of Concrete >Shrinkage Effect on Shear Strength of Reinforced, High Strength Concrete Beams
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Shrinkage Effect on Shear Strength of Reinforced, High Strength Concrete Beams

机译：收缩对高强度钢筋混凝土梁抗剪强度的影响

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摘要

Effect of autogenous shrinkage on the shear strength of reinforced high strength concrete beams is investigated, in which shear beams with the distance from compressive fiber to the centroid of reinforcing bars(effective depth) of 250mm, 500mm and 1000mm are prepared, made of high autogenous shrinkage- and expansive- or low autogenous shrinkage-high strength concretes with water to binder ratio of 0.23, respectively. The test results show that the shear strength at diagonal cracking of reinforced high autogenous shrinkage-high strength concrete beams is decreased by 5-18% compared with that of reinforced expansive- or low autogenous shrinkage-high strength concrete beams. Ultimate shear strength of the former is also lowered 20-45% than that of the latter, in which the differrences of the failure mode as well as the size effect are observed. Moreover, a new concept of the equivalent tension reinforcement ratio forthe evaluation of the shrinkage effect on the shear strength at diagonal cracking is proposed, which is tension reinforcement ratio modified by considering the effect of tension reinforcement strain due to deformation of concrete at early ages. The concept shows succesfully the linear relationship between the shear strength at diagonal cracking and the effective depth to -2/5 power independent of the magnitude of the early age deformation of concrete, and a design equation for the shear strength at diagonal cracking applicable to concrete compressive strength from nearly 90-130N/mm~2 is proposed.
机译：研究了自收缩对高强度钢筋混凝土梁抗剪强度的影响，制备了自压缩性高，压缩纤维到钢筋质心（有效深度）分别为250mm，500mm和1000mm的剪切梁。水灰比为0.23的高收缩率混凝土和膨胀或低自收缩率高强度混凝土。试验结果表明，与高膨胀或低自收缩高强混凝土梁相比，高强自收缩高强混凝土梁斜裂缝抗剪强度降低了5-18％。前者的极限剪切强度也比后者的极限剪切强度低20-45％，后者观察到破坏模式的差异以及尺寸效应。此外，提出了一种等效拉伸强度比的新概念，用于评估对角线开裂对收缩强度的收缩效应，即通过考虑早期混凝土变形对拉伸强度的影响来修改拉伸率。该概念成功地显示了斜裂缝处的剪切强度和有效深度至-2/5的有效深度之间的线性关系，而与混凝土的早期变形量无关，并且设计公式适用于混凝土的斜裂缝处的剪切强度提出了约90-130N / mm〜2的抗压强度。

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