發(fā)布時(shí)間：2018-05-30 16:00

  本文選題：半整體式無縫橋 + 溫度��； 參考：《長(zhǎng)安大學(xué)》2014年碩士論文

【摘要】：伸縮裝置長(zhǎng)期暴露在大氣中極易遭到破壞，修復(fù)需耗費(fèi)大量的人力和物力，如果增加橋跨連續(xù)長(zhǎng)度減少伸縮裝置數(shù)量或直接取消伸縮裝置，不僅大大降低橋梁的造價(jià)以及養(yǎng)護(hù)維修的巨額費(fèi)用，而且可減小對(duì)橋梁的沖擊，提高行車舒適性。整體式無縫橋應(yīng)運(yùn)而生，但已建的整體式無縫橋在運(yùn)營(yíng)過程中出現(xiàn)了各種問題，為解決這些問題，有學(xué)者提出了性能更優(yōu)的半整體式無縫橋。本文以一座（5×25）m的先簡(jiǎn)支后連續(xù)梁橋?yàn)閷?shí)例，自行設(shè)計(jì)了半整體式橋臺(tái)，利用Midas Civil建立三維有限元模型，上部結(jié)構(gòu)采用彈性空間梁格模擬，臺(tái)后土和樁側(cè)土抗力采用節(jié)點(diǎn)彈性支承模擬，支座采用線性彈簧模擬。對(duì)半整體式無縫橋的受力性能展開了以下研究：首先分析了均勻溫度、截面溫度梯度以及收縮徐變對(duì)上部結(jié)構(gòu)內(nèi)力和變形的影響，分析結(jié)果表明升溫對(duì)主梁彎矩、主梁軸力和主梁縱向位移影響較大，收縮徐變對(duì)主梁縱向和豎向位移、主梁軸力影響較大，，對(duì)橋臺(tái)樁的彎矩影響較大。其次按照現(xiàn)行規(guī)范對(duì)該半整體式無縫橋進(jìn)行了持久狀況承載能力極限狀態(tài)和正常使用極限狀態(tài)驗(yàn)算，對(duì)主梁進(jìn)行了持久狀況應(yīng)力分析驗(yàn)算。對(duì)無縫橋的應(yīng)力驗(yàn)算有別于傳統(tǒng)梁式橋，應(yīng)考慮溫度軸向壓應(yīng)力的影響以保證結(jié)構(gòu)安全性。然后對(duì)半整體式無縫橋的重要設(shè)計(jì)參數(shù)進(jìn)行了分析，參數(shù)主要包括溫度、背墻高度、背墻與主梁抗彎剛度比（背墻厚度）及地基土比例系數(shù)（臺(tái)后土剛度），并給出了關(guān)鍵參數(shù)的設(shè)計(jì)合理取值建議。最后指出了半整體式無縫橋設(shè)計(jì)和施工應(yīng)注意的事項(xiàng)，對(duì)半整體式無縫橋的后續(xù)研究及其在中國(guó)的開發(fā)應(yīng)用具有一定的參考價(jià)值。
[Abstract]:Telescopic devices are extremely vulnerable to damage when exposed to the atmosphere for a long time, and repair requires a great deal of manpower and material resources. If the number of telescopic devices is reduced by increasing the continuous length of the bridge span or directly canceling the telescopic devices, Not only the cost of bridge and the huge cost of maintenance and repair can be greatly reduced, but also the impact on the bridge can be reduced, and the driving comfort can be improved. Integral seamless bridge emerged as the times require, but there are a variety of problems in the operation of the built integrated seamless bridge. In order to solve these problems, some scholars have proposed a better performance of semi-integral seamless bridge. In this paper, a simple supported and continuous beam bridge with 5 脳 25m is taken as an example. The semi-integral abutment is designed by itself. The three-dimensional finite element model is established by Midas Civil, and the upper structure is simulated by elastic space beam lattice. The resistance of soil behind abutment and pile side is simulated by elastic support and linear spring. The mechanical properties of the semi-integral seamless bridge are studied as follows: firstly, the effects of uniform temperature, cross-section temperature gradient and shrinkage and creep on the internal force and deformation of the superstructure are analyzed. The results show that the temperature rise affects the bending moment of the main beam. The axial force of the main beam and the longitudinal displacement of the main beam have a great influence on the longitudinal and vertical displacement of the main beam, the axial force of the main beam and the bending moment of the abutment pile. Secondly, according to the current code, the ultimate state of bearing capacity and the limit state of normal use of the semi-integral seamless bridge are checked, and the stress analysis of the main beam is carried out. The stress checking calculation of the seamless bridge is different from that of the traditional beam bridge. The influence of temperature axial compression stress should be considered to ensure the safety of the structure. Then the important design parameters of semi-integral seamless bridge are analyzed. The parameters mainly include temperature, back wall height, The ratio of flexural stiffness (thickness of back wall) and the ratio coefficient of foundation soil (soil stiffness behind abutment) between the back wall and the main beam are given, and some suggestions for the design of the key parameters are given. Finally, the paper points out the matters needing attention in the design and construction of the semi-integral seamless bridge, which has certain reference value for the follow-up study of the semi-integral seamless bridge and its development and application in China.
【學(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：U441;U442.5

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