本文選題：鋼管混凝土拱橋 + 極限承載力��； 參考：《廣西大學(xué)》2015年碩士論文

【摘要】：鋼管混凝土拱橋是近二十年來發(fā)展十分迅速的一種橋梁形式,具有跨越能力大、承載能力高、耐火性能好、造價低廉、便于施工等優(yōu)點(diǎn)。然而,在實(shí)際的工程運(yùn)用中,鋼管混凝土拱橋也產(chǎn)生了一些問題,其中脫空問題是引起人們關(guān)注的問題之一。目前針對脫空對鋼管混凝土拱橋極限承載力的影響研究多是在理論方面的研究,實(shí)驗(yàn)方面的研究較少。因此,針對脫空對鋼管混凝土拱橋受力性能的影響研究是很有必要的。本文的主要工作有(1)本文以一根自然放置6年、已自然產(chǎn)生脫空的鋼管混凝土單圓管拱肋為實(shí)驗(yàn)對象,進(jìn)行了L/4點(diǎn)加載破壞實(shí)驗(yàn),得到相應(yīng)的位移、應(yīng)力、應(yīng)變數(shù)據(jù)。加載實(shí)驗(yàn)結(jié)束后對模型進(jìn)行了拆解,以研究其真實(shí)的脫空情況。實(shí)驗(yàn)發(fā)現(xiàn)鋼管拱呈現(xiàn)出非對稱變形,并有一定程度的橫向變形,但橫向變形量較小,變形以面內(nèi)變形為主。(2)利用大型通用有限元軟件ANSYS對實(shí)驗(yàn)鋼管混凝土拱肋模型進(jìn)行建模分析,分別建立了有脫粘缺陷鋼管混凝土拱肋有限元模型和無脫粘缺陷鋼管混凝土拱肋有限元模型,對脫粘對鋼管混凝土拱肋極限承載力的影響情況進(jìn)行了對比分析研究。
[Abstract]:Concrete-filled steel tube (CFST) arch bridge is a rapidly developing bridge form in the past twenty years. It has the advantages of large span capacity, high bearing capacity, good fire resistance, low cost and easy construction. However, in practical application, concrete filled steel tubular arch bridge also has some problems, among which the problem of void is one of the problems that people pay attention to. At present, the research on the effect of void on ultimate bearing capacity of concrete-filled steel tubular arch bridge is mostly in theory, but little in experiment. Therefore, it is necessary to study the effect of void on the behavior of CFST arch bridge. The main work of this paper is as follows: (1) in this paper, a concrete filled steel tube arch rib which has been emptied for 6 years has been taken as the experimental object, and the failure test of L / 4 point loading has been carried out, and the corresponding data of displacement, stress and strain have been obtained. At the end of the loading experiment, the model was disassembled to study the real void situation. The experimental results show that the steel tube arch shows asymmetric deformation, and has a certain degree of transverse deformation, but the transverse deformation is relatively small. The deformation is mainly in plane deformation. (2) the model of experimental concrete-filled steel tube arch rib is modeled and analyzed by using the large-scale general finite element software ANSYS. The finite element model of concrete-filled steel tube arch rib with debonding defect and the finite element model of concrete filled steel tube arch rib without debonding defect are established, and the influence of debonding on ultimate bearing capacity of concrete filled steel tube arch rib is compared and analyzed.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U446;U448.22

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本文編號：2108685