【摘要】：我國幅員遼闊,地勢地貌多樣,山區(qū)在我國的國土面積中占有較大的比重,隨著經(jīng)濟建設和區(qū)域統(tǒng)籌的發(fā)展,越來越多的道路在山區(qū)修建,作為道路的關鍵點橋梁起著重要的作用,山區(qū)PC(Prestress Concrete)梁橋由于其獨特的地理環(huán)境特點,其工程設計受到了越來越多橋梁工作者的關注,為了更好的發(fā)揮山區(qū)PC梁橋在交通網(wǎng)和經(jīng)濟建設中的作用,需要對山區(qū)PC梁橋進行進一步研究。本文在總結前人研究成果的基礎上,根據(jù)山區(qū)PC梁橋的結構特點和地理環(huán)境特點,主要做了如下工作:(1)從主梁內(nèi)力、橋梁撓度、混凝土收縮徐變和溫度效應等方面對橋梁上部結構的計算進行研究。對山區(qū)PC梁橋支座支座的劃分和支座的設計計算理論進行了詳細研究,結合山區(qū)PC梁橋具體特點,從山區(qū)PC梁橋橋墩形式、設計計算理論和穩(wěn)定性驗算,橋臺形式和設計計算理論,基礎形式、沉降和穩(wěn)定性計算等方面對山區(qū)PC梁橋的下部結構進行研究,并根據(jù)山區(qū)PC梁橋的特殊地理環(huán)境特點,提出了山區(qū)PC梁橋設計中的注意事項。(2)以國內(nèi)山區(qū)PC梁橋為例,建立了其有限元模型,并對其進行了自振特性分析,屈曲穩(wěn)定分析,整體和局部升降溫受力分析,影響線分析。由結構的動力特性可知由于橋梁墩高較高,結構整體性較柔,且其橫向剛度小于縱向剛度,故應注意驗算風荷載等橫向荷載作用下結構的安全性。由屈曲分析可知橋梁失穩(wěn)模態(tài)主要集中在橋梁結構的整體,高墩的剛度對橋梁屈曲失穩(wěn)模態(tài)和屈曲穩(wěn)定系數(shù)都有較大的影響。橋梁的整體升、降溫對邊跨橋墩的影響比中跨橋墩的影響大。(3)以實際工程為背景,對其上部結構、下部結構進行了設計計算,得到了不同荷載組合作用下結構的內(nèi)力、應力及結構變形數(shù)據(jù),驗證了結構在施工階段、正常使用狀態(tài)、承載力極限狀態(tài)下均滿足規(guī)范要求,為后續(xù)類似工程設計提供設計數(shù)據(jù)參考。
[Abstract]:China is a vast country with various landforms and landforms. Mountain areas occupy a large proportion of China's land area. With the development of economic construction and regional co-ordination, more and more roads are built in mountainous areas. As the key point of roads, bridges play an important role. PC (Prestress Concrete) beam bridges in mountainous areas have their unique geographical environment characteristics. More and more bridge engineers pay attention to the engineering design. In order to play a better role in the transportation network and economic construction of PC girder bridges in mountainous areas, it is necessary to further study the PC girder bridges in mountainous areas. The main works are as follows: (1) The calculation of the superstructure of the bridge is studied from the internal force of the main girder, the deflection of the bridge, the shrinkage and creep of the concrete and the temperature effect. In this paper, the lower structure of PC girder bridge in mountainous area is studied in terms of stability checking calculation, abutment form and design calculation theory, foundation form, settlement and stability calculation. According to the special geographical environment characteristics of PC girder bridge in mountainous area, the matters needing attention in the design of PC girder bridge in mountainous area are put forward. (2) Taking PC girder bridge in domestic mountainous area as an example, its finite element method is established. The dynamic characteristics of the structure show that the pier height of the bridge is higher, the structural integrity is more flexible, and the transverse stiffness is less than the longitudinal stiffness, so it is necessary to check the safety of the structure under transverse loads such as wind load. The buckling analysis shows that the buckling mode of the bridge is mainly concentrated in the whole bridge structure, and the stiffness of the high pier has great influence on the buckling mode and buckling stability coefficient of the bridge. The internal force, stress and deformation data of the structure under different load combinations are obtained. It is verified that the structure meets the requirements of the code in the construction stage, normal service state and ultimate bearing capacity state, which provides design data for similar engineering design.
【學位授予單位】：廣西大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：U448.21;U442.5

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