砖砌体砌筑方式对其力学性能影响的研究

发布时间：2018-02-15 01:56

本文关键词： 砖砌体砌筑方式抗压强度弹性模量块体高度　出处：《长沙理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：砖砌体可以看作是一种由砖块和砂浆组砌而成的整体材料。砖是一种古老的土木工程材料,因而砖砌体结构的应用具有悠久的历史,其主要用于城墙、拱桥、寺院、佛塔等。砖砌体结构发展至今,我国目前砌筑方式大多采用一顺一丁式、三顺一丁式和梅花丁的砌筑方法。19世纪20年代水泥的发明促使砂浆的强度得到了极大的提升,同时也促进了砌体结构的发展和运用。众多学者对砌体结构计算理论进行了不断深入的研究,并逐步完善其计算方法。砌体受压作为其基本受力状态,砌体的抗压强度、弹性模量等基本力学性能得到了充分的研究,并考虑其各种影响因素,提出了各种性能指标的理论计算公式。而砌体的砌筑方式并未作为影响因子考虑在理论计算中,为了提高理论计算的精度,有必要进行详细的研究,考虑砖砌体砌筑方式对其受压性能的影响。本文的主要研究内容:(1)通过对以不同砌筑方式砌合的砌体进行轴心抗压强度试验,对比分析了不同砌筑方式砌体的破坏特征及强度极限值,讨论了砌体的组砌方法对其抗压强度的影响,并根据试验结果求得了砌筑方式对砌体抗压强度的影响系数取值。(2)在《砌体基本力学性能试验方法标准》(GB/T50129-2011)的基础上,根据试验目的及试件的特性调整了轴心抗压试验的变形测点布置方案,得到准确的应力-应变数据;拟合应力-应变数据,得到各砌筑方式砌体本构曲线上升段;分析试验数据,提出了不同砌筑方式砌体的本构关系式与弹性模量计算公式。(3)对比不同高度砖块下各砌筑方式砌体的抗压强度值与弹性模量,分析比较得出砌筑方式对抗压强度和弹性模量的影响与砖块高度无关。(4)通过使用有限元分析软件ABAQUS对各砌体试件受力性能进行有限元分析,将软件得到的结果与试验结果相对比,两者相近,离散性较小,证明了试验结果的有效性。本文在试验以及有限元分析的基础上,探讨了砌筑方式对砌体基本力学性能的影响。提出砌筑方式这一影响因素的系数值,并为理论计算公式的改进提供了试验依据。
[Abstract]:Brick masonry can be regarded as an integral material composed of bricks and mortar. Brick is an ancient civil engineering material, so the application of brick masonry structure has a long history, it is mainly used in walls, arch bridges, monasteries, Pagodas and so on. The development of brick masonry structure up to now, most of the present masonry methods in our country adopt the type of one-in-one, the masonry method of Sanshun and the masonry method of plum blossom Ding. In 20s, the invention of cement in the 19th century promoted the strength of mortar greatly. At the same time, it also promotes the development and application of masonry structure. Many scholars have studied the theory of masonry structure calculation deeply, and gradually improved its calculation method. Masonry compression as its basic stress state, masonry compressive strength, The basic mechanical properties, such as modulus of elasticity, have been fully studied, and various influencing factors have been considered, and the theoretical calculation formulas of various performance indexes have been put forward. However, the masonry mode of masonry has not been considered as the influence factor in the theoretical calculation. In order to improve the accuracy of theoretical calculation, it is necessary to carry out detailed research. Considering the influence of masonry methods on the compressive performance of brick masonry, the main research content of this paper is: 1. The axial compressive strength test of masonry masonry with different masonry methods is carried out. The failure characteristics and strength limit values of masonry with different masonry methods are compared and analyzed, and the influence of masonry composition method on its compressive strength is discussed. Based on the test results, the influence coefficient of masonry mode on the compressive strength of masonry is obtained. Based on the Standard of testing method for basic Mechanical Properties of masonry (GB / T50129-2011), According to the purpose of the test and the characteristics of the specimen, the layout scheme of the deformation measuring points of the axial compression test is adjusted to obtain the accurate stress-strain data, the stress-strain data are fitted, and the rising sections of the constitutive curves of each masonry are obtained. By analyzing the test data, the constitutive relation formula and elastic modulus calculation formula of masonry with different masonry modes are put forward, and the compressive strength and elastic modulus of masonry masonry with different height are compared. Analysis and comparison show that the influence of masonry method on compressive strength and elastic modulus has nothing to do with the height of brick. The finite element analysis software ABAQUS is used to analyze the mechanical properties of masonry specimens. Comparing the results obtained by the software with the experimental results, the results are similar, and the discreteness is small, which proves the validity of the test results. In this paper, based on the experiments and the finite element analysis, The influence of masonry mode on the basic mechanical properties of masonry is discussed. The coefficient value of the influencing factor of masonry mode is put forward and the experimental basis is provided for the improvement of theoretical calculation formula.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU364

【参考文献】