钢筋钢纤维自密实混凝土梁裂缝宽度试验研究

发布时间：2018-06-02 23:45

本文选题：钢纤维 + 自密实混凝土梁　；参考：《工程力学》2017年04期

【摘要】：通过9根钢筋钢纤维自密实混凝土梁的四点弯曲试验,分析了钢纤维体积率、配筋率对钢筋钢纤维自密实混凝土梁裂缝形态、裂缝宽度以及裂缝间距等参数的影响。结果表明:在自密实混凝土梁中掺加钢纤维可有效限制裂缝的扩展,掺入体积率为0.38%和0.64%的钢纤维,可使自密实混凝土梁在正常使用阶段的最大裂缝宽度减小31%~56%,平均裂缝间距减小15%~28%,纵筋应变减小40%~56%。考虑钢纤维在试验梁开裂截面的分布以及应力传递机理,结合试验数据提出了钢筋钢纤维自密实混凝土梁最大裂缝宽度的计算公式,并与MC2010、RILEM TC-162 TDF及CECS 38:2004的公式进行了对比。计算结果表明:该文建议公式计算的最大裂缝宽度与试验值吻合较好,可用于钢筋钢纤维自密实混凝土梁最大裂缝宽度的分析与验算。
[Abstract]:Based on the four-point bending test of 9 reinforced steel fiber self-compacting concrete beams, the effects of steel fiber volume ratio and reinforcement ratio on the crack shape, crack width and crack spacing of steel fiber self-compacting concrete beams are analyzed. The results show that the crack propagation can be effectively restricted by adding steel fiber into self-compacting concrete beams, and steel fibers with volume ratios of 0.38% and 0.64% are added. The maximum crack width of the self-compacting concrete beam in normal use can be reduced by 31 / 56. the average crack spacing is reduced by 15 / 28 and the strain of longitudinal reinforcement is reduced by 40 / 5656. Considering the distribution of steel fiber in the crack section of test beam and the mechanism of stress transfer, a formula for calculating the maximum crack width of steel fiber self-compacting concrete beam is put forward, which is compared with the formula of MC2010 RILEM TC-162 TDF and CECS 38: 2004. The calculated results show that the maximum crack width calculated by the proposed formula is in good agreement with the experimental data and can be used to analyze and check the maximum crack width of steel fiber reinforced self-compacting concrete beams.
【作者单位】：东北电力大学建筑工程学院;大连理工大学海岸和近海工程国家重点实验室;
【基金】：国家自然科学基金项目(51608100,51578109) 东北电力大学博士科研启动基金项目(BSJXM-201606)
【分类号】：TU375.1

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