PVA-FRC对角斜筋小跨高比连梁受剪承载力试验研究和理论分析

发布时间：2018-05-13 20:18

本文选题：聚乙烯工程纤维增强水泥基复合材料 + 对角斜筋　；参考：《西安建筑科技大学》2013年硕士论文

【摘要】：对于剪弯比较大的普通配筋小跨高比连梁，一般表现出较差的延性性能和耗能能力，不能达到结构对其承载力、延性及耗能能力的要求。聚乙烯醇工程纤维增强水泥基复合材料（Polyvinyl Alcohol-Engineering Fiber Reinforced CementitiousComposites，简称PVA-FRC）是一种高韧性材料，具有较大的能量吸收能力和裂缝控制能力，可提高连梁承载力、延性和耗能能力。为了获得一种能够较好满足高层建筑结构需求，同时施工方便且又经济的连梁方案，本文将PVA-FRC和加设对角斜筋配筋方案同时应用于小跨高比连梁，完成了4个PVA-FRC对角斜筋小跨高比连梁试件与1个普通混凝土对角斜筋小跨高比连梁对比试件的拟静力试验，研究了PVA-FRC基体和对角斜筋共同作用对连梁裂缝及破坏形态的影响，分析其破坏过程、破坏形态、承载能力、变形能力和耗能能力等。之后，在对PVA-FRC对角斜筋小跨高比连梁受力机理分析的基础上，提出用于模拟跨高比小于等于1.5的PVA-FRC对角斜筋小跨高比连梁受剪承载力的软化拉-压杆模型，建立各拉杆、压杆的变形协调方程、物理方程和平衡方程等，，推导了PVA-FRC对角斜筋小跨高比连梁受剪承载力的软化拉-压杆模型计算公式，并给出详细的计算步骤。
[Abstract]:For the common beams with large shear and bending ratio, the ductility and energy dissipation capacity of the beams with small span and height ratio are poor, which can not meet the requirements of the bearing capacity, ductility and energy dissipation capacity of the structure. Polyvinyl Alcohol-Engineering Fiber Reinforced CementitiousComposites, (PVA-FRC) is a kind of high toughness material, which has high energy absorption ability and crack control ability. It can improve the bearing capacity, ductility and energy dissipation ability of connecting beams. In order to obtain a kind of connecting beam scheme which can better meet the needs of tall building structure and is convenient and economical to construct at the same time, this paper applies PVA-FRC and diagonal reinforcement scheme to the small span / height ratio connecting beam at the same time. Quasi static tests of four specimens of PVA-FRC diagonal bead with small span / height ratio connecting beam and one ordinary concrete specimen with diagonal bead are completed. The effects of PVA-FRC matrix and diagonal bead on the crack and failure mode of the connecting beam are studied. The failure process, failure form, bearing capacity, deformation capacity and energy dissipation capacity are analyzed. Then, based on the analysis of the stress mechanism of PVA-FRC diagonal bead beam with small span to height ratio, a softening tension-compression bar model is proposed to simulate the shear bearing capacity of PVA-FRC diagonal beam-height ratio connecting beam with a span height ratio of less than 1.5. The deformation compatibility equation, physical equation and equilibrium equation of the compression bar are derived, and the calculation formulas of the softening tension-compression bar model for the shear bearing capacity of the small span / height ratio connecting beam with diagonal tendons are derived, and the calculation steps are given in detail.
【学位授予单位】：西安建筑科技大学
【学位级别】：硕士
【学位授予年份】：2013
【分类号】：TU973

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