含再生砖粒混凝土的力学性能及框架柱抗震性能研究

发布时间：2018-10-25 12:58

【摘要】：随着我国城镇化建设步伐的加快，建筑垃圾与日俱增。利用建筑垃圾，特别是大量废弃砖块制备含再生砖粒混凝土并将其资源化利用，符合低碳经济和节能减排的社会需求，有利于我国经济建设的可持续发展，也是改善城市建设环境和发展循环经济的有效途径之一。因此，研究含再生砖粒混凝土的制备技术并将其应用于工程实际，具有重要的理论意义和社会效益。本文以试验为基础，对比研究了含再生砖粒混凝土及含再生砖粒性能增强混凝土与普通混凝土和普通再生混凝土的力学性能，同时设计制作了相应的5根再生混凝土和普通混凝土框架柱，进行了抗震性能对比试验，分析了含再生砖粒混凝土框架柱的抗震性能，得出了一些有新意的结论和建议。论文的主要工作和研究内容如下：（1）设计制备了5组共75块再生混凝土和普通混凝土试块，其中包括不同取代率下含再生砖粒性能增强混凝土2组，含再生砖粒混凝土、普通再生混凝土和普通混凝土各1组。通过力学性能试验，对比研究了上述混凝土的立方体抗压强度、轴心抗压强度、劈裂抗拉强度、抗折强度和弹性模量等，探讨了其力学性能的主要差异，并对其影响因素进行了分析。（2）以某实际结构为原型，采用文中制备的上述混凝土，设计制作了相应的5根缩尺比为1：2的再生混凝土和普通混凝土框架柱。通过拟静力低周反复加载试验，研究了含再生砖粒混凝土和普通再生混凝土框架柱的抗震性能，探讨了再生砖粒、硅粉、聚丙烯纤维和三枝抗老化纤维等对再生混凝土框架柱抗震性能的影响，对比分析了各框架柱的破坏模式、延性性能、刚度退化、耗能性能和承载能力等。此外，还根据试验结果，采用拟合方法，建立了含再生砖粒混凝土框架柱的三折线恢复力模型，给出了加、卸载各阶段的刚度退化公式，可供含再生砖粒混凝土框架柱抗震性能分析时参考。（3）应用ABAQUS有限元分析软件，采用相应的本构关系，通过有限元模拟分析，分析了其滞回曲线和破坏形态，探讨了其耗能能力，并与试验结果进行了对比，两者吻合较好，说明文中建立的模型可以较好地反映含再生砖粒混凝土框架柱的抗震性能。研究结果表明，一般情况下，含再生砖粒混凝土在一定取代率条件下，其轴心抗压强度、立方体抗压强度等与普通混凝土的相当，但劈裂抗拉强度、抗折强度和弹性模量等均低于普通混凝土；含再生砖粒性能增强混凝土的各项力学性能指标与普通再生混凝土的相比均有所提高，并且增强效果比较明显，值得进一步研究应用。研究结果还表明，一般地，含再生砖粒混凝土框架柱的破坏模式和抗震性能变化规律与普通混凝土框架柱的相似，，但在相同条件下，含再生砖粒混凝土框架柱的延性下降明显，相对普通混凝土框架柱下降30%以上。相对而言，含再生砖粒性能增强混凝土框架柱的抗震性能较好，其承载能力、延性、耗能性能等均比含再生砖粒混凝土框架柱的明显提高，具有较好的推广价值。
[Abstract]:With the acceleration of our country's urbanization construction, the construction waste is increasing. the recycled brick-like concrete is prepared by utilizing the building garbage, in particular a plurality of waste bricks, and the recycled brick-like concrete is recycled, thereby meeting the social needs of low-carbon economy and energy-saving emission reduction, and is favorable for the sustainable development of the economic construction in China, It is one of the effective ways to improve the urban construction environment and develop the recycling economy. Therefore, it is of great theoretical significance and social benefit to study the preparation technology of recycled brick concrete and its application in engineering practice. Based on the experiment, the mechanical properties of concrete and ordinary concrete and ordinary recycled concrete containing regenerated brick concrete and concrete containing regenerated brick were compared, and the corresponding five regenerated concrete and common concrete frame were designed. The anti-seismic performance comparison test is carried out, and the anti-seismic performance of the concrete frame column containing regenerated brick is analyzed, and some new conclusions are obtained. Recommendations. Main work and research contents of the thesis The following conclusions are as follows: (1) There are 5 groups of recycled concrete and ordinary concrete test blocks prepared in 5 groups, including 2 groups of reinforced concrete containing regenerated brick with different substitution rates, including regeneration. Brick concrete, common recycled concrete and ordinary mixing The compressive strength, axial compressive strength, splitting tensile strength, anti-folding strength and elastic modulus of the concrete were studied by mechanical properties test. The main differences of mechanical properties were discussed, and the influencing factors were also discussed. An analysis was made. (2) Using the above-mentioned concrete prepared in this paper, the regenerated concrete with a ratio of 1: 2 was designed and fabricated by using the above-mentioned concrete prepared in the paper. In this paper, the seismic behavior of concrete and ordinary regenerative concrete frame column containing regenerated brick is studied by quasi-static low-cycle repeated loading test, and the regenerated concrete frame, such as regenerated brick particles, silicon powder, polypropylene fiber and three-branch anti-aging fiber are discussed. The damage mode, ductility property, rigidity degradation and energy consumption of each frame column are analyzed and analyzed in comparison with the seismic performance of the columns. In addition, according to the test result, the three-fold line restoring force model of the concrete frame column containing regenerated brick is set up according to the test result, and the stiffness degradation formula of each stage of adding and unloading is given, which can be used for resisting the concrete frame column containing regenerated brick particles. By using ABAQUS finite element analysis software, using ABAQUS finite element analysis software, the hysteretic curves and failure modes of ABAQUS are analyzed, the energy consumption capacity is discussed, and the results are compared with the experimental results. By contrast, both of them agree well, and the model set up in the expository text can better reflect the regenerated brick particles. The seismic behavior of concrete frame columns is studied. The results show that under the condition of certain substitution rate, the compressive strength and compressive strength of the regenerated brick concrete are equivalent to those of ordinary concrete, but the splitting tensile strength and anti-folding strength are different. and the mechanical property indexes of the concrete containing the regenerated brick particles are improved compared with the common recycled concrete, It is worth further study and application. The results also show that, in general, the failure mode and seismic behavior of concrete frame columns containing regenerated brick are similar to that of common concrete frame columns, but under the same conditions, the ductility of the regenerated brick concrete frame column is obviously reduced, Compared with the ordinary concrete frame column, the reinforced concrete frame column has better anti-seismic performance, its bearing capacity, ductility, energy consumption and so on.
【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】：TU528.0;TU352.11

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