竖向压应力对蒸压粉煤灰多孔砖组合墙抗震性能影响的试验研究

发布时间：2019-02-28 18:09

【摘要】：砌体结构是一种拥有古老历史的结构类型,自建筑历史以来为人类居住、生产作出了巨大的贡献。长期以来我国砌体结构使用的主要材料为粘土砖,在其生产过程中消耗能源,污染空气,而且还要消耗大量的耕地,对环境破坏非常严重。随着我国禁黏禁实政策的推行,蒸压粉煤灰砖作为一种新型环保墙体材料,有着节土利废、轻质高强的优点,是粘土砖的优秀替代品,具有较大的推广与应用价值。目前关于蒸压粉煤灰多孔砖砌体抗震性能的研究有限,由于砌体结构抗震性能一般较差,因此对蒸压粉煤灰多孔砖砌体的抗震性能的研究是非常有必要的。目前已知砌体墙抗震性能影响因素里,竖向压应力是对砌体影响最大的因素之一。本文通过四片蒸压粉煤灰多孔砖墙的水平低周反复加载试验,对蒸压粉煤灰多孔砖墙在地震作用下力学性能进行了分析和研究,并根据试验结果提出了蒸压粉煤灰多孔砖砌体墙的抗剪承载力与变形能力的计算方法,同时给出了蒸压粉煤灰多孔砖墙体的恢复力模型。本文的主要研究成果如下:1.完成了 4片蒸压粉煤灰多孔砖墙体在低周反复荷载下的拟静力试验,分析研究了蒸压粉煤灰多孔砖墙体在地震作用下的抗剪承载力、破坏形态、滞回特征、位移角、延性系数等性能,结果表明加大竖向压应力在一定范围内能够有效地提升蒸压粉煤灰多孔砖墙体的抗剪承载力,能够提升墙体的刚度,约束墙体变形,但是墙体的延性有所下降。蒸压粉煤灰多孔砖墙体中心开洞后,墙体刚度明显降低,但是延性和耗能能力得到明显提升。2.在经典墙体抗剪强度理论的基础上,结合本次试验与已有相关研究资料,提出了蒸压粉煤灰多孔砖组合墙的抗剪强度与变形的计算规则,并与试验结果进行对比。结果表明,计算结果与试验结果吻合度较高,该公式具有一定参考价值。3.基于蒸压粉煤灰多孔砖组合墙抗剪强度与变形的计算规则,提出了蒸压粉煤灰多孔砖墙体的恢复力模型。
[Abstract]:Masonry structure is a kind of structure type with ancient history. Since the history of architecture, it has made great contribution to human habitation and production. The main material used in masonry structure of our country for a long time is clay brick, which consumes energy, pollutes air and consumes a large amount of arable land in the process of production, which is very serious to the environment. As a new kind of environmental protection wall material, autoclaved fly ash brick, as a new environmental protection wall material, is an excellent substitute for clay brick, which is an excellent substitute for clay brick and has great popularization and application value as a new kind of environmental protection wall material with the advantages of saving soil and waste, light and high strength. At present, the research on seismic performance of autoclaved fly ash porous brick masonry is limited. Because the seismic performance of masonry structure is generally poor, it is very necessary to study the seismic performance of autoclaved fly ash porous brick masonry. Vertical compressive stress is one of the most important factors affecting seismic behavior of masonry walls. In this paper, through the horizontal low cycle repeated loading test of four autoclaved fly ash porous brick walls, the mechanical properties of autoclaved fly ash porous brick walls under earthquake are analyzed and studied. According to the test results, the calculation method of shear capacity and deformation capacity of autoclaved fly ash porous brick wall is put forward, and the restoring force model of autoclaved fly ash porous brick wall is also given. The main research results of this paper are as follows: 1. The pseudo-static test of four autoclaved fly ash porous brick walls under low cyclic repeated loading is completed. The shear capacity, failure form, hysteretic characteristics and displacement angle of autoclaved fly ash porous brick walls under earthquake are analyzed. The results show that increasing the vertical compressive stress can effectively enhance the shear capacity of autoclaved fly ash porous brick wall, improve the stiffness of the wall and restrain the deformation of the wall, the results show that the vertical compressive stress can effectively enhance the shear capacity of the autoclaved fly ash porous brick wall, But the ductility of the wall has declined. The stiffness of porous brick wall with autoclaved fly ash decreased obviously after opening in the center, but the ductility and energy dissipation capacity were improved obviously. 2. On the basis of the classical theory of shear strength of walls, the calculation rules of shear strength and deformation of autoclaved fly ash porous brick composite wall are put forward and compared with the experimental results. The results show that the calculated results are in good agreement with the experimental results, and the formula has certain reference value. 3. Based on the calculation rules of shear strength and deformation of autoclaved fly ash porous brick composite wall, a restoring force model of autoclaved fly ash porous brick wall is proposed.
【学位授予单位】：中南林业科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11

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