【摘要】：近年來由于我國偏遠(yuǎn)山區(qū)交通的發(fā)展,我國修建了大量的高墩連續(xù)剛構(gòu)橋梁。這些剛構(gòu)橋的墩高高矮不一,少則幾十米,多則接近兩百米。正是因為連續(xù)剛構(gòu)橋發(fā)展欣欣向榮,所以很多學(xué)者對這種橋型進(jìn)行了大量的研究,已經(jīng)取得了豐碩的成果,但在墩身高度和截面形式的匹配方面研究較少。有鑒于此,本文以貴州赫章特大橋為工程背景,對墩身高度和截面形式對連續(xù)剛構(gòu)橋梁力學(xué)性能的影響進(jìn)行研究,主要內(nèi)容如下：(1)采用MIDAS CIVIL軟件建立了超高墩和常規(guī)墩兩個有限元計算模型,超高墩計算模型為赫章特大橋?qū)崢蚰Ｐ?常規(guī)高度墩計算模型為以墩高80米的等截面矩形墩代替實橋模型的主墩而建立的計算模型。之后,對兩種體系在自重作用、汽車荷載作用、溫度荷載作用、收縮徐變作用下主梁的應(yīng)力和彎矩進(jìn)行了對比分析,從中得出了一些相關(guān)結(jié)論。(2)針對墩身高度達(dá)195m的主墩,擬訂了兩種墩身截面形式：等截面雙肢薄壁墩和變截面單箱三室墩。這兩者在材料用量方面是相同的,抗彎剛度也近似相等。之后對其在裸墩狀態(tài)、最大懸臂施工狀態(tài)和成橋狀態(tài)下的穩(wěn)定性進(jìn)行了對比分析,從而得出了何種截面形式在穩(wěn)定性方面更加合理。通過以上兩方面內(nèi)容的研究,能夠使我們更加了解剛構(gòu)橋墩身高度不一樣其受力性能存在的差別,以及單肢、雙肢墩在穩(wěn)定性方面的差異,對我們更好的認(rèn)識剛構(gòu)橋提供了理論數(shù)據(jù)參考。
[Abstract]:In recent years, due to the development of traffic in remote mountainous areas in China, a large number of continuous rigid frame bridges with high piers have been built in China. The piers of these rigid-frame bridges vary in height and height, ranging from tens of meters to more than 200 meters. It is precisely because the continuous rigid frame bridge develops prosperously, so many scholars have carried on the massive research to this kind of bridge type, has already obtained the rich achievement, but in the pier height and the section form matching aspect research is relatively few. In view of this, the influence of pier height and section form on the mechanical properties of continuous rigid frame bridge is studied in this paper, taking the Guizhou Hezhang Bridge as the engineering background. The main contents are as follows: (1) two finite element calculation models of super-high pier and conventional pier are established by using MIDAS CIVIL software. The calculation model of super-high pier is a real bridge model of Hezhang large bridge. The calculation model of conventional height pier is established by replacing the main pier of the real bridge model with the rectangular pier with equal cross section which is 80 meters high. Then, the stress and bending moment of the main beam under the action of deadweight, automobile load, temperature load, shrinkage and creep are compared and analyzed. Some relevant conclusions are drawn. (2) for the main pier with the height of 195 m, two types of pier cross-section are proposed: the two-leg thin-walled pier with equal cross-section and the three-chamber pier with variable cross-section. These two materials are the same in terms of the amount of materials, bending stiffness is approximately equal. After that, the stability in bare pier state, maximum cantilever construction state and bridge state is compared and analyzed, which section form is more reasonable in terms of stability. Through the research of the above two aspects, we can understand more about the difference of the pier height of rigid frame bridge and the difference in the stability of single and double pier. It provides a theoretical reference for us to better understand the rigid frame bridge.
【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;U448.23
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本文編號：2428755