自保温开槽砌块灌孔砌体基本力学性能试验研究

发布时间：2018-05-10 08:36

本文选题：开槽砌块 + 自保温砌体　；参考：《湖南大学》2015年硕士论文

【摘要】：建筑节能与否,已经直接关系到我国的能源供求现状,并将影响气候变化和可持续发展。自保温配筋砌块砌体体系是一种能够使墙体实现自主隔热保温的结构形式,它集受力与保温于一体,真正实现了保温与结构的一体化,且能够运用在承重墙体内,有着很高的应用价值与研究价值。在自保温配筋砌块砌体的实际工程中,为方便预留用于放置横向钢筋的水平通孔,工程中常采用肋部有开槽的混凝土砌块,砌筑墙体时,将砌块开槽肋敲掉便可形成横向通孔,但目前绝大部分的国内外学者仅仅研究了未开槽砌块砌体的各项基本力学性能。本文将针对开槽自保温砌块及普通开槽砌块进行试验与理论研究,对开槽及保温块型可能对砌块砌体的力学性能产生的影响进行深入分析。根据5组共计15个自保温开槽灌孔砌体的抗压试验、5组30个灌孔自保温砌块砌体的抗剪试验,深入研究了其抗压力学性能、抗剪力学性能以及变形能力、破坏模式,并进行了相关理论的分析。根据保温层的加入,提出了两种用于自保温开槽砌块灌孔砌体的抗压强度的计算分析模型,一种是不考虑保温层的力学效应,将其视为普通砌体考虑,第二种则是将保温砌块的整个截面作为受力面考虑。第2种计算模型的计算结果与实测结果更为相近。不过如若是为了精简计算过程和结构安全性方面的考虑,则将自保温开槽砌块灌孔砌体简化为普通砌块灌孔砌体也是一种可以采用的方法。尝试推导了适用于自保温开槽砌块灌孔砌体的应力应变曲线计算式,其能够一定程度上较好反映自保温开槽砌块灌孔砌体的本构模型的规律。另本文根据实测数据衍算出的自保温开槽灌孔砌体的本构模型计算式和变形模量的计算式的实际计算值均能够和实测值比较接近。因为在肋上存在着开槽,肋部的开槽处被撬掉以后,不同匹的砌块内部的灌孔芯柱可以达到互相联结的效果,能够实现同时承受荷载的效果,所以自保温开槽灌孔砌体的受剪性能会有一定程度上的增强。根据两种分析模型建立了自保温开槽砌块的抗剪强度计算式,从计算结果与试验结果的对比可以看出,采用计算模型二的计算方法更为符合实际情况。但是,若以精简计算过程、并考虑安全储备,则将体自保温开槽砌块灌孔砌看作普通砌体来进行相关计算也是可以考虑的。采用abaqus有限元分析软件建立了自保温开槽砌块灌孔砌体和普通开槽砌块灌孔砌体的的分离式及整体式模型,分析了自保温开槽砌块灌孔砌体和普通开槽砌块灌孔砌体的抗压、抗剪过程,有限元的分析结果与试验值和规范值均比较接近。且按照本文推导的开槽砌块灌孔砌体及自保温开槽砌块灌孔砌体的强度计算公式和变形性能分析的公式为基础,对开槽砌块灌孔砌体及自保温开槽砌块灌孔砌体进行有限元的整体式模型分析是具有可行性的。
[Abstract]:Building energy saving or not has a direct bearing on the current situation of energy supply and demand in China, and will affect climate change and sustainable development. The self-insulation reinforced block masonry system is a kind of structure form which can make the wall achieve self-insulation and insulation. It integrates the force and heat preservation, and realizes the integration of heat preservation and structure, and can be used in the load bearing wall. Has the very high application value and the research value. In the practical engineering of self-insulation reinforced block masonry, in order to make it convenient to reserve horizontal through hole for placing transverse steel bar, the concrete block with slots in ribs is often used in the project. When masonry wall is built, the slotted rib of the block can be knocked out and the transverse opening can be formed. However, most scholars at home and abroad have only studied the basic mechanical properties of unslotted block masonry. In this paper, the experimental and theoretical study on slotted self-insulating block and common slotted block is carried out, and the influence of slotted and insulated block type on the mechanical properties of block masonry is deeply analyzed. According to the compression tests of 15 self-insulating slotted grouting masonry in 5 groups and 30 self-insulating block masonry with irrigation holes in 5 groups, the compressive mechanical properties, shear mechanical properties, deformation ability and failure mode of the masonry are studied in depth. The related theories are analyzed. According to the addition of insulation layer, two calculation and analysis models of compressive strength of self-insulating and slotted block grouting masonry are proposed. One is that the mechanical effect of insulation layer is not considered and considered as ordinary masonry. The second is to take the whole section of the insulation block as the bearing surface. The calculated results of the second model are more similar to the measured results. However, if the purpose is to simplify the calculation process and structural safety, it is also a feasible method to simplify the self-insulating slotted block masonry to ordinary block grouted masonry. The formula of stress-strain curve suitable for self-insulating slotted block grouting masonry is derived, which can reflect the constitutive model of self-insulating slotted block grouting masonry to some extent. In addition, according to the measured data, the constitutive model and deformation modulus of the self-insulating slotted masonry can be calculated by the actual calculation value can be close to the measured value. Because there is a slot on the rib, after the slot in the rib is broken off, the core columns in the different blocks can be connected to each other and can bear the load at the same time. Therefore, the shear performance of self-insulation slotted and perforated masonry will be enhanced to a certain extent. According to two kinds of analysis models, the calculation formula of shear strength of self-insulating slotted block is established. From the comparison of calculation results and test results, it can be seen that the calculation method of calculation model two is more in line with the actual situation. However, if the calculation process is simplified and safety reserve is considered, it can also be considered that the self-heat preservation and slotted block grouting block is regarded as ordinary masonry to carry out the relevant calculation. The separate and integral models of self-insulating slotted block grouting masonry and common slotted block grouted masonry are established by using abaqus finite element analysis software, and the compression resistance of self-insulating slotted block grouted masonry and common slotted block grouted masonry is analyzed. The results of the finite element analysis are close to the experimental values and the standard values in the shear process. Based on the strength calculation formula and deformation analysis formula of slotted block grouting masonry and self-insulating slotted block masonry, which are derived in this paper, It is feasible to analyze the integral model of slotted block grouting masonry and self-insulating slotted block grouting masonry by finite element method.
【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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