【摘要】：伴隨著中國(guó)經(jīng)濟(jì)的快速發(fā)展，，人口日益增長(zhǎng)，可用規(guī)劃土地的減少，越來(lái)越多的超高層建筑被各個(gè)地區(qū)廣泛的需求。鋼管混凝土柱因?yàn)槠鋬?yōu)異的抗壓受力性能、較好的延性以及良好的經(jīng)濟(jì)效益，已經(jīng)越來(lái)越多的用于各類(lèi)高層建筑。在工程實(shí)踐中，由于存在多根RC梁與單根STCC柱在一個(gè)高度內(nèi)相交的問(wèn)題，使得RC梁與STCC柱在連接方法上不斷的創(chuàng)新和改善，在諸多的連接方式中，因?yàn)殇摻罨炷镰h(huán)梁節(jié)點(diǎn)簡(jiǎn)便的施工程序和良好的受力性能，使其應(yīng)用最為廣泛。 本文以重慶市江北區(qū)某超高層建筑工程實(shí)例為背景對(duì)環(huán)梁節(jié)點(diǎn)進(jìn)行探討，該工程為民用建筑，地下結(jié)構(gòu)為7層，地面以上3層為裙房，上部為單塔結(jié)構(gòu)，該單塔結(jié)構(gòu)高度約280米，屬于超高層建筑的范疇，該工程采用鋼管混凝土柱與鋼筋混凝土剪力墻作為豎向承載構(gòu)件，鋼筋混凝土梁、樓板構(gòu)成水平承載構(gòu)件。在底部裙房區(qū)域，存在4根RC梁與1根STCC柱在同一高度相交的情況，連接方式采用鋼筋混凝土環(huán)梁節(jié)點(diǎn)，通過(guò)有限元軟件ABAQUS對(duì)該RC梁—STCC柱環(huán)梁節(jié)點(diǎn)進(jìn)行了實(shí)體有限元模擬及分析，對(duì)比了在不同的環(huán)筋配筋值下以及設(shè)置斜向拉筋和附加箍筋后節(jié)點(diǎn)的受力情況，并得出一些有意義的結(jié)論。本文主要完成的工作包括： ①結(jié)合重慶市某超高層建筑實(shí)際的設(shè)計(jì)及施工情況，介紹了鋼筋混凝土環(huán)梁的研究現(xiàn)狀及實(shí)際工程中應(yīng)用的情況。 ②介紹了有限元模型和計(jì)算方法，對(duì)該超高層建筑底部裙房區(qū)域的鋼筋混凝土環(huán)梁節(jié)點(diǎn)進(jìn)行了ABAQUS有限元模型模擬 ③分析了環(huán)梁節(jié)點(diǎn)在單調(diào)加載后各部分鋼筋的應(yīng)力變化，對(duì)比了環(huán)梁節(jié)點(diǎn)在不同環(huán)筋配筋下單調(diào)加載后，各部位鋼筋的應(yīng)力差異及P-△曲線。 ④對(duì)比了環(huán)梁節(jié)點(diǎn)在不同環(huán)筋配筋下，往復(fù)荷載加載后，環(huán)梁節(jié)點(diǎn)的滯回性能以及鋼筋屈服區(qū)域的分布情況。 ⑤對(duì)環(huán)梁節(jié)點(diǎn)進(jìn)行兩種優(yōu)化方案設(shè)計(jì)，通過(guò)有限元分析，對(duì)比了優(yōu)化后節(jié)點(diǎn)在單調(diào)加載下的應(yīng)力發(fā)展、P-△曲線以及在往復(fù)荷載下的滯回曲線和環(huán)梁鋼筋屈服區(qū)域的分布情況。
[Abstract]:With the rapid development of Chinese economy, the increasing population and the decrease of available planning land, more and more super-tall buildings are widely needed in various regions. Concrete-filled steel tubular columns have been used in various high-rise buildings more and more because of their excellent compressive performance, good ductility and good economic benefits. In engineering practice, because of the problem of multiple RC beams intersecting with a single STCC column in a single height, the connection method between RC beam and STCC column has been innovated and improved continuously. Because of the simple construction procedure and good mechanical performance, the reinforced concrete ring beam joints are most widely used. Based on the example of a super high-rise building project in Jiangbei District, Chongqing City, this paper discusses the ring beam joint. The project is a civil building, the underground structure is 7 stories, the three floors above the ground are a skirt, and the upper part is a single tower structure. The structure of the single tower is about 280 meters high, which belongs to the category of super high-rise building. The concrete filled steel tube column and reinforced concrete shear wall are used as vertical bearing members, and the reinforced concrete beams and slabs are used as horizontal load-bearing members. In the bottom skirt area, there are four RC beams intersecting with one STCC column at the same height. The finite element simulation and analysis of the RC beam-STCC column ring beam joints are carried out by finite element software ABAQUS, and the stress conditions of the joints under different reinforcement values and with oblique tension bars and additional stirrups are compared. And draw some meaningful conclusions. The main work accomplished in this paper is as follows: 1 according to the actual design and construction of a super high-rise building in Chongqing, the research status of reinforced concrete ring beam and its application in practical engineering are introduced. 2. The finite element model and calculation method are introduced. The ABAQUS finite element model is used to simulate the reinforced concrete ring beam joints at the bottom of the building. 3 the stress changes of each part of the ring beam joints after monotonic loading are analyzed. The stress difference and P- curve of the ring beam joints under the monotonic loading of different ring reinforcement were compared. (4) the hysteretic behavior of ring beam joints and the distribution of the yield region of the steel bars are compared after the cyclic loads are applied to the ring beam joints under different reinforcement. 5. Two optimization schemes are designed for the ring beam joints. The stress development of the optimized joints under monotone loading is compared by finite element analysis. P-curve, hysteretic curve under reciprocating load and distribution of yield region of steel bar in annular beam.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TU398.9

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