【摘要】：目前300~500m跨徑橋梁主要的結構體系有連續(xù)剛構橋、拱橋、斜拉橋和懸索橋，且大多依賴普通的混凝土、鋼結構，，其中連續(xù)剛構橋主跨尚未突破400m。超高性能混凝土（UHPC）具有強度高、收縮徐變小、耐久性強、體積穩(wěn)定性好的優(yōu)點，將其應用到橋梁結構中，可以顯著降低結構自重，提高橋梁跨越能力，降低全壽命成本。本文提出將UHPC應用到大跨梁式結構體系中，以期實現(xiàn)梁式結構體系跨越能力的突破，并重新定義基于可持續(xù)性分析與全壽命分析的300~500m跨徑橋梁適宜的結構體系。為此，本文作者主要做了以下研究工作： （1）首先明確了橋梁結構體系的概念、分類、發(fā)展演進及適用范圍，為開展結構體系的研究奠定基礎。接著詳細介紹了UHPC的材料特性、可持續(xù)性、經(jīng)濟性及其在國內外的工程應用情況，闡明UHPC在橋梁工程中尤其是大跨結構方面具有廣闊的應用前景。 （2）引入超大跨徑UHPC連續(xù)箱梁橋設計理念，選取主跨在300~500m范圍內具有代表性的梁式橋、拱橋、斜拉橋、懸索橋結構體系實橋案例，在科研團隊研究的基礎上，以實橋為工程背景進行UHPC連續(xù)箱梁橋概念設計。 （3）分別對四個不同主跨的UHPC連續(xù)箱梁橋案例進行有限元整體受力分析，并進行強度與剛度驗算，確保結構設計安全合理。有限元分析顯示，四個跨度的設計橋梁受力合理，結構體系安全可行。 （4）根據(jù)橋梁結構材料用量，對實橋與設計橋梁進行初始建造成本及能量消耗情況進行計算，并做方案對比。結果表明：UHPC連續(xù)箱梁橋方案可持續(xù)性效益明顯優(yōu)于實橋，經(jīng)濟性介于拱橋與其他三種結構體系實橋之間。 （5）接著對實橋與設計橋梁主要構件進行壽命預測，據(jù)此確定橋梁構件在整個使用壽命周期內的維護、更換時間和頻率，進而對橋梁方案的全壽命成本進行計算和對比。分析表明：UHPC連續(xù)箱梁橋具有良好的耐久性，使用壽命較長，其后期維護成本百分比低于實橋，100年壽命成本介于拱橋與其他三種結構體系實橋之間，200年壽命成本明顯低于所有實橋。
[Abstract]:At present, the main structural systems of 300 m span bridge are continuous rigid frame bridge, arch bridge, cable-stayed bridge and suspension bridge, and most of them rely on ordinary concrete and steel structure, in which the main span of continuous rigid frame bridge has not yet broken through 400 m. Ultra-high performance concrete (UHPC) has the advantages of high strength, small shrinkage and creep, strong durability and good volume stability. Its application to bridge structure can significantly reduce the weight of the structure, improve the span capacity of the bridge and reduce the whole life cost. In this paper, UHPC is applied to the long-span beam structure system in order to realize the breakthrough of the span capacity of the beam structure system, and the suitable structural system of 300 m span bridge based on sustainability analysis and whole life analysis is redefined. Therefore, the author has done the following research work: (1) firstly, the concept, classification, development, evolution and applicable scope of bridge structure system are clarified, which lays the foundation for the research of structural system. Then the material characteristics, sustainability, economy and engineering application of UHPC at home and abroad are introduced in detail, and it is expounded that UHPC has a broad application prospect in bridge engineering, especially in long-span structures. (2) the design concept of large span UHPC continuous box girder bridge is introduced, and the real bridge cases of beam bridge, arch bridge, cable-stayed bridge and suspension bridge structure system with main span in the range of 300 m are selected. On the basis of the research team, the conceptual design of UHPC continuous box girder bridge is carried out with the real bridge as the engineering background. (3) the finite element overall force analysis of four UHPC continuous box girder bridges with different main spans is carried out, and the strength and stiffness are checked to ensure the safety and reasonableness of the structural design. The finite element analysis shows that the stress of the four-span design bridge is reasonable and the structural system is safe and feasible. (4) according to the amount of bridge structure material, the initial construction cost and energy consumption of the real bridge and the designed bridge are calculated, and the schemes are compared. The results show that the sustainability benefit of UHPC continuous box girder bridge is obviously better than that of real bridge, and the economy is between arch bridge and other three kinds of structural systems. (5) then the life prediction of the main components of the real bridge and the design bridge is carried out, according to which the maintenance, replacement time and frequency of the bridge components in the whole service life cycle are determined, and then the whole life cost of the bridge scheme is calculated and compared. The analysis shows that the UHPC continuous box girder bridge has good durability and long service life, the percentage of maintenance cost in the later stage is lower than that of the real bridge, the life cost of 100 years is between the arch bridge and the other three kinds of structural systems, and the life cost of 200 years is obviously lower than that of all the real bridges.
【學位授予單位】：湖南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U442.5

【參考文獻】

相關期刊論文 前3條

1 曹萬會;高淑平;;RPC混凝土在鐵路預應力T形梁中的應用試驗[J];鐵道建筑技術;2009年07期

2 肖汝誠;陳紅;魏樂永;;橋梁結構體系的研究、優(yōu)化與創(chuàng)新[J];土木工程學報;2008年06期

3 邵旭東;詹豪;雷薇;張哲;;超大跨徑單向預應力UHPC連續(xù)箱梁橋概念設計與初步實驗[J];土木工程學報;2013年08期

本文編號：2497678