小跨高比钢纤维混凝土连梁受剪性能力学分析

发布时间：2018-02-26 06:21

本文关键词： 钢纤维混凝土连梁小跨高比受剪机理受剪承载力　出处：《郑州大学》2017年硕士论文　论文类型：学位论文

【摘要】：连梁是剪力墙结构中的重要抗震构件,既是剪力墙墙肢之间的传力链接,又是建筑结构抗震中的第一道防线,发挥着消耗地震能量的重要作用,其受力性能直接影响剪力墙体系的抗震性能。研究表明,按照框架结构中“强剪弱弯”理念所设计的传统配筋小跨高比连梁,即使配置较多数量的箍筋也难以改善其过早出现剪切失效的问题,远不能满足抗震设计的高延性、高耗能要求。为了改善小跨高比连梁的抗震性能,国内外科研团队做了大量研究分析,我国现行《混凝土结构设计规范》(GB50010-2010)建议采取新型配筋的形式(集中对角斜筋配筋、对角暗撑配筋)来改善其抗震受力性能,但会引起实际施工的困难,影响了该方法推广使用。在小跨高比普通配筋混凝土连梁中加入钢纤维以改善连梁的抗震性能,国内外已进行了一些试验研究工作,但对于小跨高比钢纤维混凝土连梁的受力机理、破坏形态、受剪承载力计算方法等方面的研究较少。本文基于16个小跨高比普通配筋钢纤维混凝土连梁(跨高比1.0~2.5、混凝土强度等级C30~C80、钢纤维体积率0%~2.5%)在反复荷载作用下的试验,对连梁的裂缝发展、破坏类型及钢筋的受力特征等试验现象进行了总结,对小跨高比普通配筋钢纤维混凝土连梁的受力机理及影响连梁变形的因素进行了分析。并研究了跨高比、混凝土强度、钢纤维体积率等因素对连梁受剪承载力的影响。在以上分析的基础上提出了小跨高比普通配筋钢纤维混凝土连梁的极限位移角计算公式,以及基于我国规范的小跨高比普通配筋钢纤维混凝土连梁的受剪承载力计算公式和基于软化拉压杆模型的受剪承载力计算方法。
[Abstract]:Connecting beam is an important seismic component in shear wall structure. It is not only the link between the legs of shear wall, but also the first line of defense in earthquake resistance of building structure, which plays an important role in consuming seismic energy. The seismic behavior of shear wall system is directly affected by its mechanical performance. The study shows that the traditional reinforced beam with small span to height ratio is designed according to the idea of "strong shear and weak bending" in frame structure. Even if a large number of stirrups are deployed, it is difficult to improve the problem of premature shear failure, which is far from meeting the requirements of high ductility and high energy consumption in seismic design. Domestic and foreign scientific research teams have done a lot of research and analysis, and the current Code for concrete structure Design in China (GB50010-2010) suggests that a new type of reinforcement (concentrated diagonal diagonal reinforcement, diagonal underbrace reinforcement) should be adopted to improve its seismic behavior. However, it will cause difficulties in practical construction and affect the popularization and application of the method. Some experimental studies have been done at home and abroad to improve the seismic behavior of the connecting beams by adding steel fiber to the common reinforced concrete beams with small span height ratio. However, for the steel fiber reinforced concrete connecting beam with small span height ratio, the mechanical mechanism and failure mode are obtained. In this paper, 16 steel fiber reinforced concrete beams with small span height ratio (ratio of span to height 1.0 ~ 2.5, concrete strength grade C30 ~ C80, steel fiber volume ratio 0 ~ 2.5) are tested under repeated load. The experimental phenomena of crack development, failure type and stress characteristics of steel bars are summarized. The mechanical mechanism of steel fiber reinforced concrete continuous beam with small span height ratio and the factors influencing the deformation of the connecting beam are analyzed. On the basis of the above analysis, a formula for calculating the ultimate displacement angle of steel fiber reinforced concrete connecting beam with small span height ratio is put forward. The formulas for calculating the shear capacity of steel fiber reinforced concrete connecting beams with small span height ratio and the shear bearing capacity calculation method based on the softening tension and compression bar model are also presented in this paper.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU37

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