泥浆砌筑砖墙抗震加固性能研究

发布时间：2018-05-11 05:02

本文选题：泥浆砌筑砖墙 + 抗震加固　；参考：《北方工业大学》2017年硕士论文

【摘要】：由于经济发展水平较低和抗震意识薄弱的原因,在我国广大农村还存在着大量无抗震构造措施,建造质量差的房屋,这使得农村往往成为地震中震害严重的地区,给广大农民生命财产安全带来极大的隐患。本文依托甘肃农房抗震加固课题,在对甘肃省农房进行调研的基础上,以在甘肃农村地区大量存在的泥浆砌筑砖墙为研究对象,进行抗震加固研究。主要内容如下:一.依据甘肃农房典型结构形式以及地震烈度分布情况,完成了对甘肃农房结构形式及分布的实地调研,调研主要集中在烈度较高和相关研究文献较少的地区,包括武威、古浪、临洮、天水、陇南,农房主要结构形式有:生土结构、砖砌体房屋、石结构房屋、木结构房屋。二.针对调研时发现的泥浆砌筑砖墙提出三种加固方式,单面水泥砂浆钢筋网加固、双面水泥砂浆钢筋网加固和角钢打包带加固,分别对加固前后的墙体进行了低周反复加载试验,从破坏情况、骨架曲线、荷载-位移滞回曲线、刚度退化以及结构延性性能方面作了研究。泥浆砌筑砖墙经过钢筋网水泥面层加固,有效改善砖砌体抗拉能力弱的特性,可以提高其抗侧刚度,承载力和变形能力得到很大提高,双面加固与单面加固相比,承载力和变形能力略有提高。泥浆砌筑砖墙经过角钢打包带加固,承载力提高不多,但其变形能力大大加强,有效改善了墙体抗剪切能力弱的特性,增强了墙体试件的整体性。三.建立加固前后泥浆砌筑砖墙的三维有限元模型,模拟了低周反复加载过程,与试验结果进行了对比分析,云图和数据分析显示与试验结果基本一致,其中未加固和角钢打包带加固后的墙体中部应力较高,墙体中部出现交叉斜裂缝,呈弯曲破坏特性,单面和双面钢筋网水泥砂浆加固后的墙体底部应力较高,墙体底部出现裂缝,呈剪切破坏形式。
[Abstract]:Due to the low level of economic development and weak seismic awareness, there are still a large number of non-seismic structural measures in the vast rural areas of our country, and the construction of poor quality houses, which makes the rural areas often become a serious earthquake damage area. To the vast number of farmers life and property safety brings great hidden danger. On the basis of investigation and investigation of agricultural houses in Gansu province, this paper takes the mud masonry wall in rural areas of Gansu province as the research object, and carries on the seismic strengthening research on the basis of the subject of aseismic reinforcement of agricultural houses in Gansu province. The main contents are as follows: 1. Based on the typical structure of agricultural houses in Gansu and the distribution of earthquake intensity, the field investigation on the structure and distribution of agricultural houses in Gansu is completed. The investigation is mainly concentrated in areas with high intensity and less relevant research literature, including Wuwei and Gulang. Lintao, Tianshui, Longnan, the main structural forms of agricultural houses: raw soil structure, brick masonry houses, stone structure houses, wooden buildings. II. In view of the mud masonry brick wall found in the investigation, three kinds of reinforcement methods are put forward, one side cement mortar reinforced mesh reinforcement, two side cement mortar reinforcement net reinforcement and angle steel packing belt reinforcement, respectively, the low-cycle repeated loading tests are carried out on the wall before and after reinforcement. The failure, skeleton curve, load-displacement hysteretic curve, stiffness degradation and ductility of the structure are studied. Mud masonry brick wall is strengthened by reinforced mesh cement surface layer, which can effectively improve the weak tensile capacity of brick masonry, and can improve the lateral stiffness, bearing capacity and deformation ability of brick masonry. The bearing capacity and deformation capacity are slightly improved. The bearing capacity of mud masonry brick wall strengthened with angle steel band is not much improved, but its deformation capacity is greatly strengthened, which effectively improves the characteristics of weak shear resistance of wall and enhances the integrity of wall specimen. III. The 3D finite element model of masonry brick wall with mud before and after reinforcement was established, the low cycle repeated loading process was simulated, and the results were compared with the test results. The cloud diagram and data analysis showed that the results were basically consistent with the test results. Among them, the stress in the middle of the wall strengthened with unreinforced and angle-steel packing belt is higher, the cross inclined crack appears in the middle of the wall, and the bending failure characteristic, the stress of the bottom of the wall strengthened with single and double-sided reinforced concrete mortar is higher, and the stress of the bottom of the wall is higher after reinforcement. Cracks appear at the bottom of the wall, which is in the form of shear failure.
【学位授予单位】：北方工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU352.11;TU36

【参考文献】