【摘要】：大力推進(jìn)建筑產(chǎn)業(yè)化的今天,混凝土疊合結(jié)構(gòu)得到了迅速的發(fā)展,其中混凝土疊合樓蓋應(yīng)用最為廣泛。本課題組所研究的PK預(yù)應(yīng)力混凝土疊合板具有施工簡(jiǎn)便、承載力高、抗裂性和整體性好、節(jié)約建材、縮短工期等優(yōu)點(diǎn),應(yīng)用前景廣闊。本文就是在該疊合樓板已有成果的基礎(chǔ)上進(jìn)行研究的。目前PK預(yù)應(yīng)力混凝土疊合底板端部預(yù)留的胡子筋是主要的梁板節(jié)點(diǎn)構(gòu)造形式。胡子筋在存放和施工過(guò)程中存在很多弊端,對(duì)施工效率和施工質(zhì)量造成影響。新型梁板節(jié)點(diǎn)構(gòu)造形式是在預(yù)制底板端部擺放連接鋼筋,沒(méi)有胡子筋,避免了這些問(wèn)題,但需要通過(guò)研究來(lái)驗(yàn)證其受力性能的可靠性。本文對(duì)4個(gè)中部有橫梁的梁板節(jié)點(diǎn)試件進(jìn)行單向靜載試驗(yàn)。通過(guò)對(duì)比分析各試件的試驗(yàn)結(jié)果,來(lái)探究PK預(yù)應(yīng)力混凝土疊合板梁板節(jié)點(diǎn)與普通整澆混凝土梁板節(jié)點(diǎn)受力性能的差異,并綜合評(píng)價(jià)連接鋼筋的這種節(jié)點(diǎn)構(gòu)造作法是否能取代胡子筋來(lái)滿(mǎn)足梁板節(jié)點(diǎn)的受力要求。對(duì)試驗(yàn)結(jié)果進(jìn)行分析對(duì)比發(fā)現(xiàn),在與通常梁板節(jié)點(diǎn)受力相反的荷載工況下,疊合板梁板節(jié)點(diǎn)在整體受力性能、極限承載力等方面均不如普通整澆混凝土梁板節(jié)點(diǎn),兩者的受力破壞機(jī)制存在差別。疊合板梁板節(jié)點(diǎn)的受力性能主要取決于預(yù)制底板與混凝土橫梁的連接性能。在疊合板梁板節(jié)點(diǎn)受力過(guò)程中,連接鋼筋和胡子筋所起到的作用相同,兩者的破壞機(jī)理一致。只要配備足夠量的連接鋼筋,梁板節(jié)點(diǎn)的受力性能就可以滿(mǎn)足工程要求。甚至在延性和耗能能力方面,連接鋼筋比胡子筋更有優(yōu)勢(shì)。但連接鋼筋會(huì)對(duì)疊合面的受力產(chǎn)生不利影響,而在《預(yù)制帶肋底板混凝土疊合樓板技術(shù)規(guī)程》中要求胡子筋與連接鋼筋交替布置,消除了這種不利影響,使疊合板梁板節(jié)點(diǎn)更加安全、可靠,完全滿(mǎn)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.
【學(xué)位授予單位】：湖南大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TU378

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