A New Concept for the Early Age Shrinkage Effect on Diagonal Cracking Strength of Reinforced HSC Beams
A New Concept for the Early Age Shrinkage Effect on Diagonal Cracking Strength of Reinforced HSC Beams
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早期收缩对钢筋HSC梁对角线开裂强度影响的新概念
DOI：
10.3151/jact.6.45
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发表时间：
2008
影响因子：
2
通讯作者：
H. Kawakane
中科院分区：
文献类型：
--
作者：
R. Sato;H. Kawakane
通过32根钢筋混凝土梁的试验，研究了早期收缩对钢筋高强混凝土梁斜裂缝承载力的影响（有效深度）为250 mm、500 mm和1000 mm，由传统的高收缩和低收缩高强度混凝土制成，水胶比为0.23。荷载试验结果表明，普通高收缩高强混凝土梁斜裂缝抗剪强度随有效深度的变化比低收缩高强混凝土梁低5%~ 18%，且两者斜裂缝抗剪强度对有效深度的依赖性有明显差异。前者的极限抗剪强度也比后者平均小23%~ 45%。此外，提出了基于等效受拉钢筋比的新概念，用于评估收缩对斜裂缝抗剪强度的影响，包括考虑混凝土早期变形产生的受拉钢筋应变的影响而修改的受拉钢筋比。这一概念成功地揭示了斜裂缝抗剪强度与有效深度的-2/5次方成线性关系，与混凝土早期变形的大小无关，并提出了适用于混凝土抗压强度为90 ~ 130 N/mm ~ 2的斜裂缝抗剪强度设计公式。
The effect of early age shrinkage on the diagonal cracking strength of reinforced high-strength concrete beams is investigated, using thirty two reinforced concrete beams with a distance from the compressive fiber to the centroid of the reinforcing bars (effective depth) of 250 mm, 500 mm and 1000 mm, made of conventional high-shrinkage and low-shrinkage high-strength concretes with a water-to-binder ratio of 0.23. The loading test results show that the shear strength at diagonal cracking of reinforced conventional high-shrinkage high-strength concrete beams is 5% to 18% lower depending on the effective depth compared with that of reinforced low-shrinkage high-strength concrete beams, and the dependence of diagonal cracking strength on the effective depth is apparently different between both. The ultimate shear strength of the former is also 23% to 45% smaller than that of the latter on average. Moreover, a new concept based on the equivalent tension reinforcement ratio for the evaluation of the shrinkage effect on the shear strength at diagonal cracking, consisting of a tension reinforcement ratio modified taking into consideration the effect of the tension reinforcement strain produced by deformation of concrete at early ages, is proposed. This 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 strengths from 90 to 130 N/mm2 is proposed.
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