本文選題：剛構(gòu)—連續(xù)組合體系梁橋 + 疲勞�。� 參考：《長沙理工大學(xué)》2014年碩士論文

【摘要】：隨著我國交通事業(yè)的迅速發(fā)展,大跨度預(yù)應(yīng)力混凝土橋梁的建造技術(shù)日趨成熟,且造價經(jīng)濟、行車舒適、便于養(yǎng)護,因而得到廣泛應(yīng)用。但在運營過程中,出現(xiàn)了各種形式的病害,嚴(yán)重影響橋梁結(jié)構(gòu)的使用性能,其中以腹板斜裂縫和跨中下?lián)献顬閲?yán)重。針對這一情況,本文以湘府路湘江大橋為工程背景,對其疲勞性能與長期下?lián)蠁栴}進行研究,主要完成了以下工作：(1)介紹了預(yù)應(yīng)力混凝土剛構(gòu)—連續(xù)組合體系梁橋的發(fā)展歷程,以及此類橋型的優(yōu)點和主要的病害情況。(2)通過對各國混凝土疲勞驗算相關(guān)規(guī)范的比較,總結(jié)了各國規(guī)范中混凝土結(jié)構(gòu)疲勞驗算的特點。建立了有限元分析模型,采用各國的驗算規(guī)范對主梁正截面進行疲勞驗算。經(jīng)對比發(fā)現(xiàn),按照國內(nèi)規(guī)范進行正截面疲勞驗算相比BSEN規(guī)范和CEB-FIP規(guī)范偏保守。(3)運用橋梁專用有限元分析軟件Midas/Civil,研究了縱向預(yù)應(yīng)力損失、系統(tǒng)溫度變化、剛度降低、收縮徐變等因素對該橋長期撓度影響。分析結(jié)果表明,縱向預(yù)應(yīng)力損失是引起橋梁下?lián)系淖钪饕蛩?其中頂板束預(yù)應(yīng)力損失比底板束預(yù)應(yīng)力損失的影響更大；混凝土收縮徐變也是橋梁長期下?lián)系闹饕绊懸蛩�；結(jié)構(gòu)剛度損失對橋梁下?lián)嫌?定的影響；整體升降溫對橋梁撓度影響較小。(4)根據(jù)本文的分析結(jié)果,從設(shè)計、施工等不同階段提出了防治預(yù)應(yīng)力混凝土連續(xù)剛構(gòu)橋跨中長期下?lián)系拇胧?br/>[Abstract]:With the rapid development of transportation in our country, the construction technology of long-span prestressed concrete bridge is becoming more and more mature, and the cost is economical, the driving is comfortable and easy to maintain, so it is widely used. However, in the process of operation, there are various kinds of diseases, which seriously affect the performance of bridge structure, among which the web slanting crack and mid-span deflection are the most serious. In view of this situation, this paper takes Xiangjiang Bridge of Xiangfu Road as the engineering background, studies its fatigue performance and long-term deflection problem, mainly accomplishes the following work: 1) introduces the development course of prestressed concrete rigid frame-continuous composite system beam bridge. And the advantages and main diseases of this type of bridge. (2) by comparing the relevant codes of fatigue calculation of concrete structures in different countries, the characteristics of fatigue calculation of concrete structures in national codes are summarized. The finite element analysis model is established, and the fatigue calculation of the normal section of the main beam is carried out by using the checking codes of various countries. By comparison, it is found that compared with BSEN code and CEB-FIP code, the fatigue checking calculation of normal section is carried out according to the domestic code. (3) the longitudinal prestressing loss, system temperature change and stiffness decrease are studied by using the bridge special finite element analysis software Midas / Civil. The effect of shrinkage, creep and other factors on the long-term deflection of the bridge. The results show that the longitudinal prestress loss is the most important factor to cause the bridge deflection, among which the prestressed loss of roof beam is more important than that of the bottom beam, and the shrinkage and creep of concrete is also the main factor affecting the long-term deflection of the bridge. The influence of structural stiffness loss on bridge deflection and the influence of global rise and cooling on bridge deflection are small. (4) according to the analysis results of this paper, the design, At different stages of construction, the measures to prevent and cure the long-term deflection of prestressed concrete continuous rigid frame bridge are put forward.
【學(xué)位授予單位】：長沙理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U441.4

【參考文獻】

相關(guān)期刊論文 前1條

1 陶永偉;;預(yù)應(yīng)力連續(xù)剛構(gòu)橋常見病害及防治對策[J];交通標(biāo)準(zhǔn)化;2012年10期

，

本文編號：1806552