PK预应力混凝土叠合楼盖梁板节点的试验研究与分析

发布时间：2019-01-17 18:31

【摘要】：大力推进建筑产业化的今天,混凝土叠合结构得到了迅速的发展,其中混凝土叠合楼盖应用最为广泛。本课题组所研究的PK预应力混凝土叠合板具有施工简便、承载力高、抗裂性和整体性好、节约建材、缩短工期等优点,应用前景广阔。本文就是在该叠合楼板已有成果的基础上进行研究的。目前PK预应力混凝土叠合底板端部预留的胡子筋是主要的梁板节点构造形式。胡子筋在存放和施工过程中存在很多弊端,对施工效率和施工质量造成影响。新型梁板节点构造形式是在预制底板端部摆放连接钢筋,没有胡子筋,避免了这些问题,但需要通过研究来验证其受力性能的可靠性。本文对4个中部有横梁的梁板节点试件进行单向静载试验。通过对比分析各试件的试验结果,来探究PK预应力混凝土叠合板梁板节点与普通整浇混凝土梁板节点受力性能的差异,并综合评价连接钢筋的这种节点构造作法是否能取代胡子筋来满足梁板节点的受力要求。对试验结果进行分析对比发现,在与通常梁板节点受力相反的荷载工况下,叠合板梁板节点在整体受力性能、极限承载力等方面均不如普通整浇混凝土梁板节点,两者的受力破坏机制存在差别。叠合板梁板节点的受力性能主要取决于预制底板与混凝土横梁的连接性能。在叠合板梁板节点受力过程中,连接钢筋和胡子筋所起到的作用相同,两者的破坏机理一致。只要配备足够量的连接钢筋,梁板节点的受力性能就可以满足工程要求。甚至在延性和耗能能力方面,连接钢筋比胡子筋更有优势。但连接钢筋会对叠合面的受力产生不利影响,而在《预制带肋底板混凝土叠合楼板技术规程》中要求胡子筋与连接钢筋交替布置,消除了这种不利影响,使叠合板梁板节点更加安全、可靠,完全满足工程需要。
[Abstract]:Today, with the development of building industrialization, concrete composite structure has been developed rapidly, among which concrete superimposed floor is the most widely used. The competitive prestressed concrete composite slab studied by our research group has the advantages of simple construction, high bearing capacity, good crack resistance and integrity, saving building materials, shortening construction period, and so on. This paper is based on the existing achievements of the composite floor. At present, the beards reserved at the end of competitive prestressed concrete composite bottom slab are the main structural form of beam-slab joint. There are many disadvantages in the storage and construction of beards bars, which affect the construction efficiency and construction quality. A new type of beam-slab joint is constructed by placing connecting steel bars at the end of the prefabricated floor, without beards, which avoids these problems, but it needs to be studied to verify the reliability of its mechanical performance. In this paper, the unidirectional static load tests are carried out on four specimens with beams in the middle of the beam and plate joints. By comparing and analyzing the test results of each specimen, the difference of the mechanical behavior of the competitive prestressed concrete composite beam-slab joint and the common cast-in-place concrete beam-slab joint is explored. And whether the joint construction method can replace the beards bar to meet the stress requirements of the beam-slab joint is evaluated synthetically. Through the analysis and comparison of the test results, it is found that under the load condition contrary to the normal beam-slab joints, the composite beam-slab joints are inferior to the common cast-in-place concrete beam-slab joints in the overall mechanical performance and ultimate bearing capacity. There is a difference in the mechanism of mechanical failure between them. The mechanical behavior of composite beam-slab joints mainly depends on the connection performance of precast floor slab and concrete beam. In the process of bearing the joint of composite plate beam and plate, the connection of steel bar and beards bar plays the same role, and the failure mechanism of them is the same. The mechanical behavior of beam-slab joints can meet the engineering requirements as long as they are equipped with sufficient connecting steel bars. Even in terms of ductility and energy dissipation, connecting steel bars has an advantage over beard bars. However, the connecting steel bar will have a negative effect on the stress on the superimposed surface, and in the Technical Specification for concrete Composite floor Slab with prefabricated ribbed Slab, it is required that the beards bar and the connecting steel bar should be arranged alternately, thus eliminating this adverse effect. So that the laminated beam-plate joints are more secure, reliable and fully meet the engineering needs.
【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】：TU378

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