HPFL加固受火RC梁刚度及挠度研究

发布时间：2018-02-11 01:15

本文关键词： 截面刚度高性能复合砂浆钢筋网火灾加固　出处：《湖南大学学报(自然科学版)》2017年05期 　论文类型：期刊论文

【摘要】：结合国内外对火灾后钢筋混凝土结构中混凝土和钢筋力学性能的研究,分别采用三台阶模型和二台阶模型对火灾后混凝土和钢筋的弹性模量进行简化计算.根据简化计算模型和等效弹性模量法,对受火后钢筋混凝土梁截面的弹性模量进行等效,得到受火后钢筋混凝土梁截面的弹性模量.根据有效惯性矩法,对高性能复合砂浆钢筋网加固受火RC梁开裂前和开裂后的截面进行等效换算,将受拉区钢筋和全截面的高性能复合砂浆钢筋网换算成弹性模量为混凝土弹性模量的换算截面.在考虑剪切变形影响的前提下,对高性能复合砂浆钢筋网加固受火RC梁的截面刚度和挠度进行理论推导,并结合实验数据验证理论公式的合理性.分析结果表明,推导所得的计算公式与试验数据基本吻合.
[Abstract]:Combined with the research on the mechanical properties of concrete and reinforcement in reinforced concrete structures after fire at home and abroad, Three step model and two step model were used to simplify the calculation of the elastic modulus of concrete and steel bar after fire. According to the simplified calculation model and the equivalent elastic modulus method, the elastic modulus of reinforced concrete beam section after fire was equivalent. The elastic modulus of reinforced concrete beam section after fire is obtained. According to the effective moment of inertia method, the section before and after cracking of RC beam strengthened by high performance composite mortar steel mesh is equivalent converted. The high performance composite mortar steel mesh in tensile zone is converted into the section where elastic modulus of concrete is converted into elastic modulus of concrete. The influence of shear deformation is considered. The section stiffness and deflection of RC beam strengthened by high performance composite mortar reinforced concrete mesh are theoretically deduced, and the rationality of the theoretical formula is verified by the experimental data. The analysis results show that the calculated formula is in good agreement with the experimental data.
【作者单位】：湖南大学土木工程学院;
【基金】：国家自然科学基金青年基金资助项目(51108173)~~
【分类号】：TU375.1

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