不同砌筑方法下横孔砌块砌体抗压性能研究

发布时间：2018-08-09 18:10

【摘要】：针对普通竖孔砌块空心率小、墙体易开裂、保温隔热性差、不易施工和埋管等问题,本课题组提出了一种新型混凝土空心砌块—横孔连锁混凝土空心砌块。该砌块由顶板、底板、上凸肋、下凸肋及侧壁等部位组成,具有防渗、抗裂、隔热、轻质、抗震、节地、环保等多种优点,且有干砌法与湿砌法两种砌筑方法。近年,本课题组对该砌块砌体的抗压性能、抗剪性能、抗震性能、局部受压性能等进行了研究。但这些研究均是在单一的砌筑方法下进行的,未考虑不同的砌筑方法对砌体力学性能的影响。本文对不同砌筑方法下该砌块砌体的抗压性能进行了试验研究以及非线性有限元分析,主要研究内容如下:首先,通过对6组(共36个)该砌块砌体试件进行抗压性能试验,对比分析其破坏特征及抗压承载力的差异,研究了不同砌筑方法及不同砌块型号对该砌块砌体抗压性能的影响。研究结果表明:干砌砌体在受压过程中先于横孔角部出现裂缝并不断发展,然后丧失承载能力,而湿砌砌体多在还未捕捉到裂缝的情况下直接被压溃,且后者的抗压强度明显高于前者。同时,不同砌筑方法对较小尺寸砌块砌体抗压性能的影响更为显著。其次,通过大型有限元分析软件ABAQUS建立不同砌筑方法下该砌块砌体的有限元模型,对砌体的竖向受压过程进行模拟,对比分析两种模型的应力分布云图、塑性应变分布云图以及极限承载力等,并结合抗压试验过程及结果对砌体的破坏机理进行探讨。研究了不同侧壁厚度及砌块厚度对湿砌模型抗压性能的影响。
[Abstract]:In order to solve the problems such as small heart rate of common vertical hole block, easy cracking of wall, poor thermal insulation, difficult construction and buried pipe, a new type of concrete hollow block, interlocking concrete hollow block with horizontal hole, is proposed by our team. The block is composed of roof, floor, upper convex rib, lower convex rib and side wall. It has many advantages, such as impermeability, crack resistance, heat insulation, light weight, earthquake resistance, ground saving and environmental protection, and there are two masonry methods: dry masonry method and wet masonry method. In recent years, our group has studied the compressive, shear, seismic and local compressive properties of the masonry. However, these studies are carried out under a single masonry method without considering the influence of different masonry methods on the mechanical properties of masonry. In this paper, the compressive performance of the masonry block under different masonry methods and nonlinear finite element analysis are studied. The main contents are as follows: firstly, the compressive performance tests of 6 groups (36 groups) of masonry specimens are carried out. The effects of different masonry methods and block types on the compressive properties of the masonry are studied by comparing and analyzing the difference of the failure characteristics and compressive bearing capacity of the masonry. The results show that the dry masonry appears cracks and develops continuously before the corner of the horizontal hole in the process of compression, and then loses its bearing capacity, while the wet masonry is crushed directly without catching the cracks. The compressive strength of the latter is obviously higher than that of the former. At the same time, the influence of different masonry methods on the compressive performance of small block masonry is more significant. Secondly, the finite element model of the block masonry under different masonry methods is established by the large-scale finite element analysis software ABAQUS, and the vertical compression process of the masonry is simulated, and the stress distribution cloud diagram of the two models is compared and analyzed. The plastic strain distribution cloud diagram and ultimate bearing capacity are used to study the failure mechanism of masonry. The influence of different lateral wall thickness and block thickness on the compressive performance of wet masonry model was studied.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU522.3

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