【作者】 李功标；

【导师】 熊丹安；

【作者基本信息】 武汉理工大学 ， 结构工程， 2002， 硕士

【摘要】 本文通过对16根钢筋混凝土梁的受弯试验研究，验证了采用在梁底粘贴角钢进行加固这一加固技术的适用性和有效性，并推导了其正截面承载力及短期刚度的计算公式。 本次试验从混凝土强度等级、粘钢面积、锚固情况和加载方式这几方面入手，研究了这些因素对加固效果的影响。试验表明，对于一些混凝土强度等级较低(≤C15)的钢筋混凝土梁不宜采用这种加固方法；而且加强角钢端头的锚固可大大地提高加固效果。然后，通过对各组试件的荷载-挠度曲线的进一步分析表明：对于混凝土强度等级高于C15的钢筋混凝土梁，采用这种粘角钢加固法能有效提高钢筋混凝土梁的正截面承载力和短期刚度。 最后，通过学习和借鉴国内外混凝土结构规范中有关钢筋混凝土梁正截面强度和刚度的计算公式，以及国内外的科研成果，本文提出了采用这种加固方法加固的受弯构件的正截面承载力和短期刚度的计算公式。本文还采用非线性有限元程序ANSYS对粘钢加固试件进行了模拟分析和验证。公式中的假设与现行规范GB10—89的公式中的假设基本一致，其计算结果与试验值吻合较好。但是，鉴于试验范围及所采集到的试验数据有限，公式中的有关系数尚需进一步修正。更多还原

【Abstract】 By experimental research of sixteen reinforced concrete beams, this thesis validates the feasibility and efficiency of the method strengthening RC beams by gluing angle steels, and the calculation formulas of the bearing capacity of normal section and short-dated rigidity of beams are deduced.In this experiment, some conditions, such as the strength of concrete, the area of angle steel, ends of the steel and modes of loading are considered, and the influence of them are analyzed. The results show that the strengthening method is not fit for RC structures made of low-strength concrete(C15). Then, by analyzing the extensive test data of load-displacement and bear-curvature, we can conclude that the crack resistance, bearing capacity of normal section and short-dated rigidity will be improved a lot when the strength of concrete is not so low.At last, by learning and making use of formulas of the bearing capacity of normal section and short-dated rigidity in some domestic and overseas concrete construction standard and technological research achievements, the calculation formulas are proposed. It was analyzed and validated by the nonlinear finite element program-ANSYS. The assumption in this paper are approximately according with present code, and the calculated results agree with experimental results very well. Because of limited experimental range and collected data, some parameters should be revised.更多还原