【作者】 张伟；

【导师】 张科强； 张波；

【作者基本信息】 西安工业大学 ， 结构工程， 2018， 硕士

【摘要】 我国村镇地区大量存在生土结构,生土结构融于自然,有利于环境保护和生态平衡。但生土结构自身的抗震性能较差成为阻碍其发展的重要因素。为传承、保护我国宝贵的建筑遗产以及利用现代科学技术进一步开发、应用、改良这种建筑物种,深入开展生土结构的研究工作,归纳整理国内外生土结构研究领域的大量文献。本文综合夯土承重墙体的研究,提出可再生竹材加固夯土承重墙体的思路,针对农村房屋的承重夯土墙体提出了五种加固方案并进行有限元分析,分析研究加固墙体的破环形态、破坏特点、承载力、抗震性能以及通过对比讨论五种加固方案提出最优的加固方案。主要研究和成果如下:(1)研究分析了五种加固夯土墙体的破坏形态。发现构造柱和包裹在夯土墙体外表面的竹材网片对夯土墙体整体强度起到加固作用,防止了未加固夯土墙体出现局部破坏很快丧失承载能力。(2)通过对夯土墙体抗压承载能力分析,发现加固后的墙体其承载能力相对素夯土墙体不同程度均有提高,加固的墙体承载能力提高效率为双面加固>单面加固>构造柱加固>素夯土墙体。结果表明,双面斜向布置竹材网加固的夯土墙体其抗压承载能力最高,是未加固夯土墙体的承载力的2倍。(3)对5种加固夯土墙体模拟抗震进行了拟静力分析研究。分析竹片加固墙体的的滞回曲线和骨架曲线、刚度退化等情况,发现加固后的墙体的抗剪承载能力均有明显提高,说明竹材加固后的夯土墙体是一种行之有效的加固方法;在承载能力、延性、耗能、刚度退化方面,对不同加固方法的墙体抗震性能做出评价,得到双面加固的夯土墙体各项抗震指标是最优的。(4)竹片加固墙体抗剪承载力计算方法研究。在模拟研究的基础上,分析竹片加固墙体的抗剪承载力,结合加固墙体的受力进行理论分析和数值模拟,提出其抗剪承载力计算公式。本文的研究为村镇夯土墙结构房屋的新建与加固改造提供了经济、可靠、科学的实践理论基础。更多还原

【Abstract】 In our country,there is a large number of raw soil structures in villages and towns,and the raw soil structure is natural,which is good for environmental protection and ecological balance.However,the poor seismic performance of the raw soil structure itself has become an important factor hindering its development.In order to inherit and protect our precious architectural heritage and use modern science and technology to further develop,apply and improve this kind of architecture,carry out research work on raw soil structure and summarize a great deal of literature in the field of earth and soil structure research at home and abroad.Based on the research of rammed earth load-bearing wall,this paper put forward the idea of using renewable bamboo to reinforce rammed earth load-bearing wall,put forward five kinds of reinforcement schemes and carried out finite element analysis for the bearing rammed earth wall in rural houses,Broken ring shape,failure characteristics,bearing capacity,seismic performance and by comparing the five reinforcement solutions discussed to arrive at the optimal reinforcement program.The main research and results are as follows:(1)Studied and analyzed the failure modes of five kinds of reinforced rammed earth walls.It is found that the structural column and the bamboo net wrapped on the outer surface of the rammed earth wall reinforce the integral strength of the rammed earth wall so as to prevent the partial destruction of the rammed earth wall which is not reinforced and quickly lose its carrying capacity.(2)Through the analysis of the compressive bearing capacity of rammed earth wall,it is found that the bearing capacity of the strengthened wall is higher than that of the simple rammed earth wall.The efficiency of the strengthened wall is as follows: double side strengthening > single side strengthening > structural column strengthening > plain rammed earth wall.The results show that the rammed earth wall strengthened by double-sided inclined bamboo net has the highest bearing capacity under compression.It is twice the bearing capacity of unreinforced rammed earth wall.(3)The quasi-static analysis of five kinds of reinforced rammed earth walls is carried out.Analysis of the hysteretic curve and the skeleton curve of the bamboo wall reinforcement,the stiffness degradation and so on,we find that the shear wall bearing capacity of the reinforced wall has obviously improved,which shows that the rammed earth wall after the bamboo reinforcement is a kind of Effective reinforcement method;in carrying capacity,ductility,energy consumption,stiffness degradation,To evaluate the seismic performance of the wall with different reinforcement methods,it is found that the seismic indexes of the rammed earth wall with double-sided reinforcement are the best.(4)Study on the calculation method of shear strength of bamboo wall.Based on the simulation study,analysis of shear strength of bamboo wall reinforcement and combining with the reinforcement of the wall to perform theoretical analysis and numerical simulation,put forward the formula of shear capacity.The research in this paper provides an economic,reliable and scientific theoretical basis for the construction and reinforcement of rammed earth wall houses in villages and towns.更多还原