机制生土砖砌体的变形模量及泊松比试验研究

发布时间：2018-10-07 18:06

【摘要】：随着国家生态文明建设的提出,以及人们对环境保护意识的不断增强,传统高耗能、高污染的建筑发展模式已经显现出了极大的弊端,绿色环保可持续发展的生土建筑又重新受到研究学者的关注。生土建筑除了具有施工工艺简单、易于就地取材、较好的热工性能以及对于室内环境良好的调节作用等优势,而且生态环保、低能耗,符合可持续发展的理念。传统土坯为人工制作,采用湿法或干法成形,强度低、耐水性和耐久性较差。改性生土坯和改性生土坯砌体在强度和耐久性方面有很大提高,这已经在一些试验研究中得到证实,机制生土砖随着改性生土材料的研究因运而生。已有研究结果表明机制生土砖砌体具有较好的抗压和沿通缝抗剪性能,可用于墙体砌筑,但对生土砖砌体的变形模量和泊松比研究较少,本文通过试验对机制生土砖砌体的变形模量和泊松比进行研究和探讨,是对机制生土砖砌体力学性能的初探,也是机制生土砖推广及工程应用所必须解决的关键问题。通过对17个不同砌筑砂浆、不同高厚比的机制生土砖砌体进行轴心抗压试验,获得机制生土砖砌体抗压强度值和应力-应变关系曲线,研究机制生土砖砌体轴心受力过程中的破坏形态和变形性能。通过试验现象以及分析应力-应变关系曲线,得到机制生土砖砌体的变形模量和泊松比的试验值,探讨了机制生土砖砌体变形模量和泊松比计算时的应力取值点,通过对试验数据进行拟合,得到机制生土砖砌体变形模量和泊松比的经验计算公式,分析了各种因素对机制生土砖砌体变形模量和泊松比的影响。试验结果表明,砂浆中掺料类别及砌体高厚比均对机制生土砖砌体变形模量和泊松比有影响,本文研究得出的机制生土砖砌体变形模量和泊松比与砌体抗压强度之间的回归公式具有一定的准确性。本文的研究,提供了一种确定机制生土砖砌体变形模量和泊松比的取值方法和经验计算公式,为生土材料制定统一试验标准提供了参考,为结构理论计算和有限元模拟提供了试验依据。
[Abstract]:With the construction of national ecological civilization and the increasing awareness of environmental protection, the traditional building development model with high energy consumption and high pollution has shown great disadvantages. Green and sustainable development of the raw soil architecture has again attracted the attention of researchers. In addition to the advantages of simple construction technology, easy to use local materials, better thermal performance and good adjustment to indoor environment, the raw soil building has the advantages of ecological environmental protection and low energy consumption, which accords with the concept of sustainable development. Traditional adobe is made by hand, wet or dry forming, low strength, poor water resistance and durability. The strength and durability of modified raw adobe and modified raw adobe masonry have been greatly improved, which has been proved in some experimental studies. The results show that the mechanism brickwork has good compressive and shear resistance, and can be used in wall masonry, but the deformation modulus and Poisson's ratio of raw soil brick masonry are less studied. In this paper, the study on the deformation modulus and Poisson's ratio of the mechanism raw soil brick masonry is a preliminary study of the mechanical properties of the mechanism raw soil brick masonry, and the key problem that must be solved in the popularization and engineering application of the mechanism raw soil brick masonry. The compressive strength and stress-strain curves of 17 different masonry mortar masonry with different thickness ratio are obtained by axial compression test. In this paper, the failure and deformation behavior of brickwork under axial loading are studied. By analyzing the stress-strain relationship curve, the experimental values of deformation modulus and Poisson's ratio of machine-made raw soil brick masonry are obtained, and the points of stress selection when calculating the deformation modulus and Poisson's ratio of machine-made raw soil brick masonry are discussed. Through fitting the experimental data, the empirical calculation formulas of deformation modulus and Poisson's ratio of mechanism raw soil brick masonry are obtained, and the effects of various factors on deformation modulus and Poisson's ratio of mechanism raw soil brick masonry are analyzed. The experimental results show that the types of admixtures and the ratio of height to thickness of mortar have effects on the deformation modulus and Poisson's ratio of the brick masonry. The regression formula between the deformation modulus and Poisson's ratio and the compressive strength of the brick masonry obtained in this paper has certain accuracy. In this paper, a method and empirical formula for determining deformation modulus and Poisson's ratio of mechanism raw soil brick masonry are provided, which provides a reference for the establishment of unified test standard for raw soil materials. It provides experimental basis for structural theoretical calculation and finite element simulation.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU522

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