纤维增强混凝土对角斜筋小跨高比连梁抗震性能试验研究及受剪承载力分析

发布时间：2018-02-28 22:07

本文关键词： 纤维增强混凝土小跨高比连梁对角斜筋抗震性能受剪承载力　出处：《土木工程学报》2017年02期 　论文类型：期刊论文

【摘要】：为了改善小跨高比连梁的抗震性能,考虑连梁跨高比和对角斜筋配筋率的影响,在课题组前期试验的基础上,在对角斜筋上增设拉筋,制作3个纤维增强混凝土(FRC)对角斜筋小跨高比连梁试件,对其进行拟静力试验,分析连梁的破坏形态、滞回耗能、刚度退化以及延性等抗震性能。基于试验结果及小跨高比连梁的受剪机理,建立连梁受剪承载力计算公式。结果表明,在小跨高比连梁对角斜筋上增设拉筋之后,跨高比为1.25和1.5的连梁,由原来的剪切破坏变为弯曲剪切破坏,并提高了连梁的延性、抗损伤能力和耗能能力;提出的连梁受剪承载力计算公式的计算值与试验值吻合较好。
[Abstract]:In order to improve the seismic performance of small span / height ratio continuous beam, considering the influence of span height ratio and diagonal skew reinforcement ratio, the diagonal skew reinforcement was added to the diagonal skew reinforcement on the basis of the preliminary experiment by our research group. Three fiber reinforced concrete (FRC) specimens with small span-to-height ratio of diagonal tendons were made, and the quasi-static tests were carried out to analyze the failure patterns and hysteretic energy consumption of the beams. Based on the experimental results and the shear mechanism of small span / height ratio continuous beams, a formula for calculating the shear capacity of connecting beams is established. The results show that after adding tension bars to diagonal diagonal tendons of small span / height ratio continuous beams, When the ratio of span to height is 1.25 and 1.5, the shear failure is changed from the original shear failure to the bending shear failure, and the ductility, damage resistance and energy dissipation ability of the connected beam are improved, and the calculated values of the shear bearing capacity of the connected beam are in good agreement with the experimental values.
【作者单位】：西安建筑科技大学;宁夏大学;
【基金】：国家自然科学基金(51278402) 国家自然科学青年基金(51408328)
【分类号】：TU352.11

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