磷石膏空腔模盒组合楼板构件结构优化及力学性能研究

发布时间：2018-03-04 14:17

本文选题：磷石膏　切入点：空腔楼盖　出处：《昆明理工大学》2017年硕士论文　论文类型：学位论文

【摘要】：磷石膏空腔模盒组合楼板是一种新型的结构形式,以预制磷石膏空腔模盒作为永久性施工内模填充材料,从而使楼板内部形成空腔结构。这种结构形式不仅充分利用了工业废料磷石膏,而且该结构形式具有自重轻、刚度大、施工方便及提高净空等特点,适用于大柱网、大跨度、大开间等建筑。目前国内外对该体系研究有限,本论文通过对构件填充材料磷建筑石膏胶凝材料的初步制备以及其力学性能、石膏空腔模盒的体型及应用,构件的试验以及有限元模拟进行了研究,其研究内容如下:(1)通过对云南省云天化三环化工集团有限公司提供的磷石膏预处理得到磷建筑石膏,并以磷建筑石膏作为主要胶凝材料,并掺加外掺料以及外加剂等,均匀加水拌合后,得到磷建筑石膏基胶凝材料。(2)通过对磷建筑石膏试件的抗压强度、抗折强度、弹性模量、泊松比的力学性能测定,得出较优的配合比参数。并测出磷建筑石膏试件的抗压强度为14.8MPa,抗折强度为5.3MPa,弹性模量为1486N/mm2,泊松比为0.12。(3)对磷建筑石膏空腔模盒体型、制作特性、施工特性、性能及应用的研究,得到的石膏空腔模盒的体型设计合理,受力性能较好且空心率高。(4)通过对石膏空腔模盒进行构件的设计及制作,并对其3组不同结构的构件进行静载试验,主要分析了构件在集中荷载的作用下底部中心位移、主要部位的应变以及破坏状态下裂缝的发展等。通过对比3组不同结构的构件,2-1-2三排半椭球体石膏空腔模盒构件的极限破坏荷载为254kN,且主要部位的应变分布范围小,破坏时裂缝成对角线的形式贯通板底的X型裂缝带。最终得出2-1-2三排半椭球体石膏空腔模盒构件的石膏空腔模盒体型以及摆放位置是最有利构件的受力状态。(5)利用有限元软件Ansys对试件进行了非线性有限元分析。主要分析了 3中不同结构构件的变形、应变等。对比得出构件的在集中荷载的作用下,2-1-2三排半椭球体石膏空腔模盒构件开裂时板底中心位移时0.44mm,且板底主要部位的应变较小。同时将有限元分析主要结果与试验结果对比得出:2-1-2三排半椭球体石膏空腔模盒构件开裂时中心位移、应变的分布相差不大。
[Abstract]:The phosphogypsum cavity box composite floor is a new type of structure. The prefabricated phosphogypsum cavity box is used as the filling material for the permanent construction internal mold. The structure not only makes full use of phosphogypsum from industrial waste, but also has the characteristics of light weight, high rigidity, easy construction and high clearance. It is suitable for large column net and long span. At present, the research on this system is limited at home and abroad. In this paper, the preliminary preparation and mechanical properties of phosphogypsum cementitious material, the shape and application of gypsum hollow cavity box, are studied. The experiment of the component and the finite element simulation are studied. The research contents are as follows: (1) the phosphogypsum is obtained by pretreatment of phosphogypsum provided by Yuntianhua Sanhuan Chemical Group Co., Ltd. Taking phosphogypsum as the main cementitious material, and adding admixture and admixture, after evenly mixing with water, the phosphogypsum based cementitious material. 2) the compressive strength, flexural strength and elastic modulus of phosphorous building gypsum are obtained. The mechanical properties of Poisson's ratio were measured and the optimum mix ratio parameters were obtained. The compressive strength, flexural strength, elastic modulus and Poisson's ratio of phosphogypsum plaster were 14.8MPa, 5.3MPa, 1486Nm2 and 0.12.3respectively. The construction characteristics, performance and application of the gypsum hollow cavity box are studied. The results show that the shape design of the gypsum cavity cavity box is reasonable, the mechanical performance is better and the hollow rate is high. 4) through the design and manufacture of the gypsum hollow cavity mold box, The static load tests of three groups of members with different structures are carried out, and the central displacement at the bottom of the member under concentrated load is mainly analyzed. The strain of the main parts and the development of cracks in the failure state are compared. The ultimate failure load of the three groups of members with different structures is 254kN, and the strain distribution range of the main parts is small, and the limit failure load of the structure is 254kN. At the time of failure, the cracks form diagonal form through the X-shaped fracture zone at the bottom of the board. Finally, the shape and position of the gypsum hollow cavity box of 2-1-2 rows of semi-ellipsoidal gypsum hollow cavity box members are the most favorable force state of the components. The nonlinear finite element analysis of the specimen was carried out with the finite element software Ansys. The results show that the central displacement of the plate bottom is 0.44 mm when the structure is cracked, and the strain of the main part of the board bottom is small. At the same time, the main results of finite element analysis are summarized. Compared with the experimental results, the central displacement of the hollow cavity box members of the three rows of half ellipsoid gypsum with two rows of two to one two is obtained when they crack. The distribution of strain is similar.
【学位授予单位】：昆明理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU52

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