带拼缝钢筋桁架混凝土叠合板静载试验研究

发布时间：2019-04-09 06:37

【摘要】：带拼缝钢筋桁架混凝土叠合板是在钢筋桁架混凝土预制底板上现浇叠合层所形成的一种新型叠合楼板。这种新型的叠合板主要的受力结构为桁架钢筋,在预制底板拼接时需设置拼缝,并根据不同的拼缝形式,设置拼缝处防裂钢筋。带拼缝钢筋桁架混凝土叠合板具有施工方便、节省材料、刚度大、整体性好等优点,是预制装配式建筑的发展方向。为了研究带拼缝钢筋桁架混凝土叠合双向板在工程实际中的力学性能,以及不同拼缝形式对叠合双向板力学性能的影响,本文对带拼缝钢筋桁架混凝土叠合双向板的吊装阶段、施工阶段、使用阶段模型进行了静力荷载试验。具体研究内容包括:(1)通过对钢筋桁架混凝土预制底板施工吊装阶段试验,研究吊装时预制底板的受力特点、内力分布和裂缝情况,并计算出了脱模吸附力的大小。试验表明过程阶段预制底板内力均较小,试验中所用吊装方式满足施工要求;(2)通过对钢筋桁架混凝土预制底板施工阶段的静力荷载试验,研究了预制底板在施工阶段的内力分布和变形情况。试验表明在正常施工荷载下,预制底板具有较好的力学性能,满足施工阶段的要求;(3)该阶段试验中预制底板以后浇300mm拼缝和密拼两种不同的拼缝形式双拼,并浇筑叠合层后,制作成钢筋桁架混凝土叠合双向板。通过对这两种不同拼缝形式的叠合双向板进行极限承载力试验,研究了叠合双向板内力分布、变形、裂缝分布和破坏形式等特点。试验表明钢筋桁架混凝土叠合板具有较高的承载力,并且从裂缝分布情况来看,具有较好的延性,力学性能良好。从开裂荷载、裂缝分布和极限承载力的对比结果可以看出后浇300mm拼缝形式拼接的叠合板具有更好的整体性。并对比了两种支座形式对钢筋桁架叠合双向板力学性能的影响。通过本文的研究,进一步验证了带拼缝钢筋桁架混凝土叠合双向板的工程应用性,为带拼缝钢筋桁架混凝土叠合板在今后的应用提供了依据。
[Abstract]:The reinforced truss concrete laminated slab with joint is a new type of laminated slab formed by cast-in-place laminated floor on the precast slab of reinforced truss concrete. The main force-bearing structure of this new type of laminated plate is truss steel bar. It is necessary to set up splice when the precast floor is spliced, and to set up the crack-proof steel bar at the seam according to different splicing forms. With the advantages of convenient construction, material saving, large stiffness, good integrity and so on, the reinforced truss concrete laminated plywood with jointed joints is the developing direction of prefabricated building. In order to study the mechanical properties of reinforced truss concrete laminated two-way slab with splice in engineering practice, and the influence of different splicing forms on the mechanical properties of composite double-directional slab, the hoisting stage of concrete composite double-directional slab with jointed steel truss is studied in this paper. In the construction stage, the static load test is carried out by using the phase model. The main contents are as follows: (1) the mechanical characteristics, internal force distribution and cracks of the prefabricated slab during hoisting are studied through the hoisting stage test of the precast slab of reinforced truss concrete, and the magnitude of the desorption force is calculated. The test shows that the internal force of the precast floor is small in the process stage, and the hoisting method used in the test meets the construction requirements. (2) through the static load test of the precast slab of reinforced truss concrete during the construction stage, the internal force distribution and deformation of the precast floor in the construction stage are studied. The test results show that the prefabricated floor has good mechanical properties under normal construction load and meets the requirements of the construction stage. (3) in this stage test, two kinds of two-way splice, 300mm joint and close joint, were poured into the precast floor, and then the reinforced truss concrete composite two-way slab was made after pouring the laminated layer. Through the ultimate bearing capacity test of these two kinds of laminated bi-directional slabs, the characteristics of internal force distribution, deformation, crack distribution and failure form of the laminated bi-directional plates are studied. The test results show that the reinforced truss concrete laminated plates have high bearing capacity and good ductility and good mechanical properties according to the crack distribution. From the comparison of crack load, crack distribution and ultimate bearing capacity, it can be seen that the post-cast 300mm splice-type laminated plates have better integrity. The effects of two kinds of supports on the mechanical properties of steel truss superimposed two-way slab are compared. Through the research in this paper, the engineering application of concrete laminated two-way slab with jointed reinforced truss is further verified, which provides a basis for the future application of reinforced truss concrete laminated slab with jointed steel truss.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU375

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