新型装配式井字梁自保温楼盖受力性能试验研究

发布时间：2018-12-07 07:36

【摘要】：建筑工业化和支撑体住宅是未来居住建筑发展的必然趋势。为适应支撑体住宅大空间自由分割和装配化的需要,本文提出了一种新型装配式井字梁自保温楼盖体系,它主要由井字梁、上下层板和板间发泡混凝土组成,不仅具有预制化程度高、现场湿作业少、施工速度快和经济效益好等特点,同时具有保温隔热、隔音、自重轻、跨度大等特点。对这种新型楼盖的受力性能进行试验研究和理论分析有较重要的理论意义和重要的实用价值。本文对新型装配式井字梁自保温楼盖的1/2缩尺模型进行了静力试验。该试验楼盖由六块预制板、四根预制叠合梁和四根预制柱拼接而成。通过楼盖构件的实际浇筑施工和楼盖的拼装,验证了新型楼盖的浇筑施工顺序和现场拼装顺序可行的。通过对试验楼盖的加载试验,分析了模型的裂缝发展,研究了楼盖在荷载作用下的刚度变化、竖向承载力和拼接性能,得出了新型装配式井字梁自保温楼盖的裂缝发展情况与实心楼盖的裂缝发展情况基本一致,同时楼盖的竖向承载能力高,连接性能好。在试验的基础上,进行了单跨楼盖和连续楼盖的有限元分析,得出单跨楼盖的支座刚度较小,可假定为铰支座；而连续楼盖的支座刚度较大,可假定为半刚性支座,设计时取楼盖支座弯矩与跨中弯矩的比值为1.15。将新型装配式井字梁自保温楼盖与实心楼盖、空心井字梁楼盖进行了有限元对比分析,发现填充发泡混凝土块的楼盖变形基本符合平截面假定,上下层楼板形成整截面工作,所以其承载力和刚度均比空心井字梁楼盖的高,而与实心楼盖的受力状态基本一致,综上所述,填充发泡混凝土块的装配式井字梁自保温楼盖,在实现了工业化、节能保温、减轻自重和满足支撑体要求的同时,使楼盖的上下层板整截面工作,提高了承载能力和刚度,并使顶板和底板均可仅配单层板钢筋,有很好的应用前景。通过将试验结果和有限元分析结果对比分析,得出试验楼盖的刚度与有限元模拟的空心楼盖的刚度差异不大,因为试验楼盖的拼接接触面在荷载作用下较早地出现裂缝,导致试验楼盖刚度降低。故新型装配式井字梁自保温楼盖的跨厚比和各细部尺寸可以按照空心井字梁楼盖的跨厚比取值。
[Abstract]:Building industrialization and supporting housing is the inevitable trend of residential building development in the future. In order to meet the needs of large space free partition and assembly of supporting housing, this paper presents a new type of self-insulating floor system of assembled well beam, which is mainly composed of well beam, upper and lower laminates and foamed concrete between plates. It not only has the characteristics of high prefabrication degree, less wet operation on site, fast construction speed and good economic benefit, but also has the characteristics of heat insulation, sound insulation, light weight, large span and so on. It is of great theoretical significance and practical value to study and analyze the mechanical behavior of this new floor. In this paper, a 1 / 2 scale model of the self-insulating floor of a new assembled beam is tested by static test. The test floor consists of six prefabricated boards, four prefabricated laminated beams and four prefabricated columns. Through the actual construction of floor member and the assembly of floor, it is proved that the construction sequence of new type floor and the sequence of site assembly are feasible. Through the loading test of the test floor, the crack development of the model is analyzed, and the stiffness change, vertical bearing capacity and splicing performance of the floor under load are studied. It is concluded that the crack development of the self-insulating floor is basically consistent with that of the solid floor. At the same time, the vertical bearing capacity of the floor is high and the connection performance is good. On the basis of the test, the finite element analysis of single span floor and continuous floor is carried out, and it is concluded that the support stiffness of single span floor is small and can be assumed as hinged support. The support stiffness of continuous floor is large and can be assumed as semi-rigid support. The ratio of bending moment of floor support to mid-span moment is 1.15. The finite element comparison and analysis of self-insulating floor and solid floor and hollow well beam floor of a new type of prefabricated well beam are carried out. It is found that the deformation of floor slab filled with foamed concrete is basically in accordance with the assumption of plane section, and the whole section of upper and lower floors is formed. Therefore, its bearing capacity and stiffness are higher than those of hollow beam-beam floor, and the stress state of solid floor is basically the same. To sum up, the self-insulating floor of prefabricated well beam filled with foaming concrete blocks has achieved industrialization and energy conservation and insulation. At the same time, reducing the weight and meeting the requirements of the support, the whole section of the upper and lower floors of the floor can be worked, the bearing capacity and stiffness of the floor can be improved, and the roof and the floor can only be matched with the single-layer steel bar, which has a good prospect of application. By comparing the test results with the finite element analysis results, it is concluded that the stiffness of the test floor is not different from that of the hollow floor simulated by the finite element method, because the joints of the test floor appear cracks earlier under the action of load. The stiffness of the test floor is reduced. Therefore, the ratio of span to thickness and the size of each detail can be calculated according to the ratio of span to thickness of hollow well beam floor.
【学位授予单位】：东南大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU375.2

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