再生混凝土新旧界面抗剪性能试验研究

发布时间：2018-05-28 22:20

本文选题：再生混凝土 + 新旧界面　；参考：《哈尔滨工业大学》2017年硕士论文

【摘要】：建筑垃圾资源化是当今社会一项重要的议题,而再生混凝土技术为建筑垃圾资源化提供了方向。目前普通混凝土新旧界面抗剪问题存在于各种工程中,包括新建建筑和既有建筑的加固,而再生混凝土新旧界面受力性能研究还很少。如果再生混凝土将来大范围应用,新旧界面受力性能会成为一个重要影响因素,而界面抗剪强度是一个主要影响因素。界面抗剪是一个复杂的过程,并受到各种因素的影响,因此本文将进行大量再生混凝土新老混凝土界面抗剪试验,对混凝土新旧界面性能进行研究,其主要内容如下:(1)本文设置新旧混凝土界面凿毛、植筋和界面凿毛涂抹隔离剂三种工况,通过24个试件的试验,开展了再生混凝土新旧界面抗剪性能的研究,分析了再生混凝土新旧界面植筋抗剪的过程和机理,提出了钢筋在界面植筋抗剪过程中的作用机理。(2)以混凝土强度等级、界面植筋率、再生粗骨料取代率等影响界面抗剪的因素为变量,通过108个试件开展了再生混凝土新旧界面抗剪承载力的试验研究,得到了各工况下的剪力-剪切位移曲线,对比分析了分析各因素对再生混凝土新旧混凝土界面抗剪的作用,探讨了了各个界面抗剪作用下的变形能力以及对于抗剪延性的改善作用,基于试验结果,提出了再生混凝土新旧界面抗剪的模型和适用于再生混凝土新旧界面抗剪的建议计算公式。(3)利用ABAQUS有限元分析软件进行了新旧再生混凝土试件的数值模拟,对新旧界面抗剪性能进行了相应的分析,结合试验结果,对比了分析了试验和模拟的结果,验证了植筋对界面抗剪性能的影响。
[Abstract]:The recycling of construction waste is an important issue in the society today, and recycled concrete technology provides the direction for the recycling of construction waste. At present, the shear resistance of new and old interfaces of ordinary concrete exists in all kinds of projects, including the reinforcement of new buildings and existing buildings, but the research on the mechanical properties of the new and old interfaces of recycled concrete is still few. If recycled concrete is widely used in the future, the mechanical properties of the new and old interfaces will become an important factor, and the shear strength of the interface will be a major factor. The interfacial shear resistance is a complex process and affected by various factors. Therefore, a large number of tests on the interfacial shear resistance of recycled concrete, new and old concrete, will be carried out in this paper to study the properties of new and old concrete interface. The main contents are as follows: (1) in this paper, we set up three working conditions of new and old concrete interface haircut, planting tendons and interfacial hair-chiseling and smearing isolator. Through the experiments of 24 specimens, the shear resistance of regenerated concrete interface between new and old is studied. In this paper, the process and mechanism of shear resistance of regenerated concrete with new and old interface are analyzed, and the mechanism of reinforcement acting in the process of shear resistance is put forward. The concrete strength grade and the ratio of interfacial reinforcement are put forward. The influence factors such as the replacement ratio of recycled coarse aggregate on the shear resistance of the interface are variables. Through 108 specimens, the shear bearing capacity of the new and old interface of recycled concrete is studied, and the shear displacement curves under various working conditions are obtained. The effects of various factors on the shear resistance of recycled concrete between new and old concrete are compared and analyzed. The deformation capacity of each interface and the improvement of shear ductility are discussed, based on the experimental results. The model of new and old interface shear resistance of recycled concrete and the formula for calculating the new and old interface shear resistance of recycled concrete are proposed. The numerical simulation of new and old recycled concrete specimens is carried out by using ABAQUS finite element analysis software. The shear properties of the new and old interfaces are analyzed. The results of test and simulation are compared, and the effect of planting bars on the shear properties of the interface is verified.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU528

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