新型泡沫混凝土轻质墙板及外挂节点的力学性能研究

发布时间：2018-05-02 12:34

本文选题：泡沫混凝土 + 外挂墙板　；参考：《武汉理工大学》2015年硕士论文

【摘要】：本课题中的新型泡沫混凝土是采用粉煤灰、陶粒、发泡剂按配合比通过碱激发的方式高效发泡、高温蒸汽养护而成的混凝土。泡沫混凝土中陶粒和水泥浆通过物理发泡的方式产生具有较大孔隙率的结构,因而减少了墙板的密度,其密度为600kg/m3。同时提高了墙板的自保温性能,经测定材料的导热系数为0.14~0.15W/(m·k),隔热性能较好。作为外挂墙板,其具有装饰贴面粘贴强度高,模块化程度高,施工周期短,安装效率高,具有良好的经济效果和技术前景。本文在这一课题的背景下,对新型外挂板的力学特性进行研究。本文围绕这一新型材料,分别对泡沫混凝土材料、墙板以及墙板预埋节点的力学性能进行了研究工作,并对对试验数据进行了一定的理论分析,得出了主要完成了如下研究工作:(1)进行了新型泡沫混凝土的基本力学性能研究,通过试验得出了其抗压强度,劈裂抗拉强度,静力受压弹性模量,与防锈涂层钢筋的粘结性能等基本力学性能指标。对比两种不同配合比的材料,分析其基本力学性能。结果表明,其具有较好的力学性能,能满足规范规定限值以及工程实际需要。(2)通过试验研究了墙板的力学特性,进行了不同配合比的墙板受弯承载力试验,抗冲击试验,吊挂力试验,对比不同配合比的墙板的试验结果,分析板的受力机理,不同配合比的板试验结果并无明显差别。其试验结果均超出GB/T23451-2009《建筑用轻质隔墙条板》限值的要求,说明墙板具有优良力学性能,且板的设计偏安全。(3)亦对板端预埋节点的力学特性进行了试验研究,采用单调加载的方式进行,对不同节点形式以及不同配合比板的受弯和受剪承载力、节点耗能以及节点的破坏形态进行了研究与分析,得出了各节点的极限承载力。(4)以试验数据为支撑,得出了墙板的正截面受弯配筋计算公式、斜截面受剪承载力的验算公式以及板的挠度计算公式,其公式的理论计算值与试验值接近,可以运用于实际工程。本文最后给出了节点强度的设计建议值,本文建议从经济的角度考虑,应采用P2节点作为泡沫混凝土墙板的预埋节点。最后得出本文的主要结论,并提出了进一步研究方向。
[Abstract]:The new type of foamed concrete in this paper is made of fly ash, ceramsite and foaming agent, which is highly foamed by alkali excitation and cured by steam at high temperature. In foamed concrete, ceramic particles and cement slurry produce structures with large porosity by physical foaming, thus reducing the density of wall panels, the density of which is 600 kg / m ~ (3). At the same time, the self-insulation property of the wall panel is improved. The thermal conductivity of the material is 0.14~0.15W/(m KG, and the thermal insulation property is better. As an external wall board, it has high intensity of decorative veneer, high degree of modularization, short construction period, high installation efficiency, and has good economic effect and technical prospect. In this paper, the mechanical properties of a new type of external panel are studied under the background of this subject. In this paper, the mechanical properties of foamed concrete materials, wall panels and embedded joints are studied, and the experimental data are analyzed theoretically. The basic mechanical properties of the new foam concrete are studied. The compressive strength, the splitting tensile strength, the static compressive elastic modulus of the new foam concrete are obtained. Basic mechanical properties such as bond property with antirust coated steel bar. The basic mechanical properties of two kinds of materials with different mix ratio were analyzed. The results show that it has better mechanical properties, can meet the specified limits of the code and the actual engineering needs. The mechanical properties of the wall panels are studied through experiments, and the flexural bearing capacity tests and impact tests of the wall panels with different mix ratios are carried out. The test results of hanging force are compared with the test results of wall panels with different mix ratios, and the stress mechanism of the panels is analyzed. There is no obvious difference between the test results of different mix ratios and the test results. The test results exceed the limit value of GB/T23451-2009 < lightweight partition plate for building use >, which shows that the wall board has excellent mechanical properties, and the design of the board is on the side of safety. The mechanical properties of the plate end embedded joints are also studied experimentally. In this paper, the bending and shear bearing capacity, energy consumption of joints and failure modes of joints are studied and analyzed by monotone loading. The ultimate bearing capacity of each joint is obtained. (4) based on the test data, the formulas for calculating the flexural reinforcement of the normal section of the wall plate, the checking formula for the shear capacity of the inclined section and the deflection formula for the plate are obtained. The theoretical calculation value of the formula is close to the experimental value and can be used in practical engineering. At the end of this paper, the design value of joint strength is given. It is suggested that P2 joint should be used as the embedded joint of foamed concrete wall slab from the point of view of economy. Finally, the main conclusions of this paper are obtained, and further research directions are proposed.
【学位授予单位】：武汉理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU528.2

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