加气混凝土与普通混凝土黏结界面剪切性能试验

发布时间：2018-06-02 20:56

本文选题：密肋复合墙结构 + 棱柱体剪切试验　；参考：《哈尔滨工业大学学报》2017年08期

【摘要】：密肋复合墙体是由钢筋混凝土肋构成的框格与内嵌轻质加气混凝土砌块组成,是密肋复合墙结构的主要承力构件.由于密肋复合墙体特殊的制作工艺,在混凝土肋与加气混凝土砌块相接触的位置处形成一黏结界面,而此类黏结界面的性能目前仍不明确,为此,有必要在材料层次上对加气混凝土砌块与普通混凝土黏结界面性能进行研究.本文以密肋复合墙结构为研究背景,采用棱柱体剪切试验的方法测定加气混凝土砌块与普通混凝土黏结界面性能,分析黏结界面倾斜角度对试件的破坏形态和界面强度的影响.结果表明,当倾斜角较小时,试件发生界面剪切破坏,而倾斜角增大,试件趋向于发生轻质加气混凝土砌块材料破坏;根据试验数据拟合出τ_n关于σ_n的二次界面破坏包络线方程,并分析界面变形特性,提出界面切应力-滑移位移特征曲线,为密肋复合墙结构构件层次和结构层次力学性能的研究提供理论和数值计算依据.
[Abstract]:Multi-ribbed composite wall is composed of frame lattice of reinforced concrete rib and lightweight aerated concrete block embedded in it. It is the main load-bearing member of multi-ribbed composite wall structure. Because of the special fabrication technology of multi-rib composite wall, a bonding interface is formed at the position where the concrete rib is in contact with the aerated concrete block, and the properties of this kind of bonding interface are still unclear, so for this reason, It is necessary to study the interfacial properties of aerated concrete blocks and ordinary concrete at the material level. In this paper, based on the multi-ribbed composite wall structure, the interface properties of aerated concrete block and ordinary concrete are measured by prism shear test, and the influence of the inclination angle of the bonding interface on the failure pattern and interface strength of the specimen is analyzed. The results show that when the inclination angle is small, the interfacial shear failure occurs, while the inclined angle increases, and the specimen tends to occur the damage of lightweight aerated concrete block material. According to the experimental data, the equation of the quadratic interface failure envelope of 蟿 _ s _ n for 蟽 _ n is fitted, and the characteristic curve of interfacial shear stress-slip displacement is presented by analyzing the deformation characteristics of interface. It provides theoretical and numerical basis for the study of the mechanical properties of multi-ribbed composite walls.
【作者单位】：北京交通大学土木建筑工程学院;广州地铁设计研究院有限公司;
【基金】：国家自然科学基金(51678031)
【分类号】：TU528

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