【摘要】：隨著我國(guó)城市的交通建設(shè)進(jìn)一步的發(fā)展，互通立交橋梁、高架橋得到了廣泛的應(yīng)用。為實(shí)現(xiàn)交通轉(zhuǎn)向功能的匝道，由于其連接的主干線(xiàn)與交叉線(xiàn)間較大的高程差，往往需要設(shè)計(jì)為匝道橋梁。同時(shí)在城市中受到地形、地物、地下管線(xiàn)等多方面因素的影響，為了使匝道橋設(shè)計(jì)滿(mǎn)足路線(xiàn)平面及道路建筑界限凈空的要求，在關(guān)鍵節(jié)點(diǎn)處需要設(shè)置門(mén)架式橫梁跨越橋下的道路。 本文對(duì)帶外伸橫梁的匝道橋的設(shè)計(jì)計(jì)算理論與方法作了初步的介紹，分析了影響此類(lèi)橋梁上部結(jié)構(gòu)受力的主要因素，并結(jié)合惠州金愷大道A匝道4x30m預(yù)應(yīng)力混凝土連續(xù)箱梁橋?yàn)閷?shí)例進(jìn)行設(shè)計(jì)研究，主要研究?jī)?nèi)容有： （1）由于門(mén)式橫梁的存在，主梁的彎扭耦合效應(yīng)更為復(fù)雜，分析研究主梁在自重及整體溫度等荷載工況及荷載組合下的內(nèi)力分布情況。 （2）因約束支座布置情況的不同，在荷載工況作用下對(duì)縱向主梁的內(nèi)力分布情況及PSC截面設(shè)計(jì)方面的影響，以及支承反力的變化。 （3）根據(jù)現(xiàn)行橋梁抗震設(shè)計(jì)規(guī)范，對(duì)比縱向固定支座設(shè)置的不同，在地震工況作用下的支反力變化。 通過(guò)Midas Civil有限元軟件計(jì)算分析，總結(jié)了此類(lèi)橋梁因外伸橫梁的存在，對(duì)縱向主梁內(nèi)力分布、截面設(shè)計(jì)、支承反力影響： （1）由于大外伸橫梁的存在，使得大橫梁處的主梁負(fù)彎矩減少約10%、扭矩值增加約一倍、剪力值無(wú)大變化。 （2）由于縱向主梁與大橫梁的相互制約，在整體溫度工況下將產(chǎn)生較大的水平支反力，，對(duì)于下部橋墩以及基礎(chǔ)起不利作用。 （3）縱向固定支座建議設(shè)置在外伸大橫梁處，同時(shí)需重視對(duì)下部結(jié)構(gòu)的抗震設(shè)計(jì)。通過(guò)以上的結(jié)論可以為今后在類(lèi)似匝道橋設(shè)計(jì)和施工中提供一些參考。
[Abstract]:With the further development of urban traffic construction in China, interchange bridges and viaducts have been widely used. In order to realize the ramp of traffic steering function, because of the large elevation difference between the main line and the crossing line, it is often necessary to design the ramp bridge. At the same time, affected by terrain, ground objects, underground pipelines and other factors in the city, in order to make the ramp bridge design meet the requirements of route plane and road building boundary clearance, it is necessary to set up a portal beam across the road under the bridge at the key node. In this paper, the design and calculation theory and method of ramp bridge with extended beam are introduced, and the main factors affecting the force of superstructure of this kind of bridge are analyzed, and the design and research of 4x30m prestressed concrete continuous box girder bridge on ramp A of Jinkai Avenue in Huizhou are carried out as an example. The main research contents are as follows: (1) due to the existence of portal beam, the coupling effect of bending and torsional of main beam is more complex. The internal force distribution of the main beam under load conditions such as self-weight and overall temperature and load combination is analyzed and studied. (2) due to the different arrangement of constraint supports, the influence on the internal force distribution of longitudinal main beam and the design of PSC section under the action of load condition, as well as the change of support reaction force. (3) according to the current seismic design code of bridge, the change of support force under seismic working condition is compared with the different setting of longitudinal fixed support. Through the calculation and analysis of Midas Civil finite element software, this paper summarizes the influence of the existence of this kind of bridge on the internal force distribution, section design and supporting reaction force of the longitudinal main beam: (1) because of the existence of the large extended beam, the negative bending moment of the main beam at the large beam is reduced by about 10%, the torque value is about doubled, and the shear value has no great change. (2) due to the mutual restriction between the longitudinal main beam and the large beam, there will be a large horizontal support reaction force under the overall temperature condition, which will play an adverse role in the lower pier and foundation. (3) it is suggested that the longitudinal fixed support should be installed at the extended beam, and the seismic design of the lower structure should be paid attention to at the same time. The above conclusions can provide some references for the design and construction of similar ramp bridges in the future.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：U442.5

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