现浇保温复合剪力墙轴心受压试验研究与有限元分析

发布时间：2018-11-29 09:02

【摘要】：本课组题提出了一种新型保温复合剪力墙,与传统复合墙体相同之处是:都是由内外两侧结构层、中间保温层三层构成,然后由连接件(钢丝、钢筋等形式)保证协同工作。本文提出的墙体创新点在于对其内部连接形式进行创新:在保温层上开孔洞,在孔洞中布置套筒,套筒中设置螺栓,以及由加强筋与堵头组成的堵头件,来限制保温隔热板的浮动,并且隔断保温隔热板孔洞中的热桥,以及确保保温隔热板与砂浆层的可靠、高强度连接,从而提高复合剪力墙的整体受力性能。这种墙体兼具轻质、节能、便于施工等优点,具有良好的市场发展前景。现浇保温复合剪力墙作为一种新型结构,为了验证其有效性和实用性,为以后的工程实用中提供依据,本文对这种新型复合墙体进行了基本的力学性能试验研究,主要的研究内容和研究成果如下:(1)进行了三片保温复合墙体的轴心受压试验。文中将墙体设计为对称结构,并将套筒间距分别设为300mm,400mm,500mm,通过施加均布荷载,考察结构在受力过程中的变形情况和破坏形态、结构的初始开裂荷载与极限承载力以及钢筋和混凝土应变等数据,得出结论:构件在轴心压力下,破坏形态为压弯破坏,破坏形式为脆性破坏;复合保温剪力墙中链接键的间距对剪力墙的轴心受压承载力,最大竖向位移,破坏形态的影响不大,对平面外砂浆层的稳定性和构件破坏位置有一定影响。从实验结果来看,剪力键间距不应大于500mm,否则外层砂浆的不能良好的与保温板连接,稳定性出现问题;采用《混凝土结构设计规范》钢筋混凝土柱轴心受压承载力公式时,应对外层砂浆所提供的承载力乘以折减系数。(2)进行了三个保温小试块的剪切试验,考察套筒内形成的砂浆短柱在剪切力作用下表现情况。本文记录了三个试块的抗剪承载力和中间混凝土层与砂浆层的相对位移情况,并将实验值与理论值相比较,分析结果表明:连接两侧砂浆层的套筒在剪切力作用下变形明显分为弹性阶段和塑性阶段,且套筒内短柱在抵抗结构层之间的剪切力上能起到良好的作用。不同结构层之间能够协同受力。(3)以试验为基础,利用有限元分析软件ABAQUS建立模型,模拟保温墙体受力全过程,验证有限元模拟的可行性并充分了解结构在受力过程中的应力变化情况。建立对比模型,研究不同因素结构受力方面的影响。本文研究的内容证明了保温复合剪力墙的实用性和可行性,并为后续的进一步研究提供了基本的试验数据,对实际工程中的应用和推广也有十分重要的意义。
[Abstract]:A new type of heat preservation composite shear wall is put forward in this paper, which is similar to the traditional composite wall. It is composed of inner and outer two sides structure layer, three layers of intermediate insulation layer, and then the joint (steel wire, steel bar, etc.) ensures the cooperative work. The innovation of the wall in this paper lies in the innovation of its internal connection: opening holes in the insulation layer, arranging the sleeve in the holes, setting bolts in the sleeve, and the plugging parts composed of reinforcing bars and plugging heads. To limit the floating of the insulation board, and to cut off the heat bridge in the hole of the insulation board, and to ensure the reliable and high strength connection between the insulation board and the mortar layer, so as to improve the overall mechanical performance of the composite shear wall. This kind of wall has the advantages of light weight, energy saving and easy construction, so it has a good market development prospect. As a new type of structure, cast-in-place heat preservation composite shear wall is a new type of structure. In order to verify its validity and practicability and provide the basis for future engineering practice, this paper has carried on the basic mechanical property test research to this kind of new composite wall. The main research contents and results are as follows: (1) the axial compression test of three thermal insulation composite walls is carried out. In this paper, the wall is designed as a symmetrical structure, and the sleeve spacing is set to 300mm / 400mm / 500mm respectively. By applying uniform load, the deformation and failure mode of the structure are investigated. The initial cracking load and ultimate bearing capacity of the structure as well as the strain of steel bar and concrete are obtained. It is concluded that under axial pressure, the failure form is compression and bending failure, and the failure form is brittle failure. The distance between link keys in composite thermal insulation shear wall has little effect on the axial compression capacity, maximum vertical displacement and failure form of shear wall, and has certain influence on the stability of off-plane mortar layer and the failure location of the member. From the experimental results, the shear bond spacing should not be greater than 500mm, otherwise, the outer mortar can not be well connected with the insulation board, the stability of the mortar has problems; When the formula of axial compressive capacity of reinforced concrete columns is adopted, the bearing capacity provided by outer mortar should be multiplied by the reduction coefficient. (2) the shear tests of three small thermal insulation test blocks are carried out. The behavior of mortar columns formed in sleeve under shear stress was investigated. In this paper, the shear capacity of the three test blocks and the relative displacement of the intermediate concrete layer and the mortar layer are recorded, and the experimental values are compared with the theoretical values. The results show that the deformation of the sleeve connecting the two sides of mortar layer under shear stress is obviously divided into elastic stage and plastic stage, and the short column in the sleeve can play a good role in resisting the shear force between the structural layers. (3) based on the experiment, the finite element analysis software ABAQUS is used to establish the model to simulate the whole process of the thermal insulation wall. To verify the feasibility of finite element simulation and fully understand the stress changes of the structure during the process of loading. A comparative model was established to study the influence of different factors on the stress of the structure. The content of this paper proves the practicability and feasibility of thermal insulation composite shear wall, and provides the basic test data for further research. It is also of great significance to the application and popularization of practical engineering.
【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】：TU398.2

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