發(fā)布時間：2018-01-20 12:50

  本文關鍵詞： 斜拉桁架T構橋 受力特性 病害機理 正交試驗 維修加固　出處：《長安大學》2014年碩士論文　論文類型：學位論文

【摘要】：預應力混凝土斜拉桁架T構橋是一種新穎的橋梁結構，，由斜拉結構、桁架結構及T形剛構組合而成。此類型橋梁上弦桿的豎直分力支撐下弦桿，形成彈性支撐連續(xù)梁，上弦桿水平分力對下弦桿形成加勁作用，受力與斜拉橋相似；桿件的軸力均大于彎矩，其構件表現(xiàn)出明顯的二力桿受力特性，軸力控制設計，受力與桁架橋相似；自重與預應力產生的效應最大，其他荷載效應較小，表現(xiàn)出連續(xù)剛構的受力特性。其自重輕、剛度大、受力明確、外觀優(yōu)美，但此類橋型跨中設置的剪力鉸及邊跨設置的拉壓支座時常破壞，影響橋梁結構的安全和使用。因此，研究該類橋梁的病害機理及維修加固方案具有重要意義。主要研究內容有： （1）本文以福建省洪塘大橋為研究對象，通過建立有限元模型對預應力混凝土斜拉桁架T構橋的主要受力構件，包括上弦桿、下弦桿、腹桿、T縱梁及V型墩，進行力學特性分析，總結出構件在不同荷載工況下的內力、應力及位移的變化規(guī)律。 （2）利用現(xiàn)場勘察報告，針對引起預應力混凝土斜拉桁架橋T構橋病害的因素進行理論分析和敏感性分析，并通過正交試驗設計分析多因素組合情況下的病害機理，利用SPSS軟件計算正交表，提出敏感性參數(shù)重要性排序。 （3）綜合預應力混凝土斜拉桁架橋T構橋病害機理和參數(shù)敏感性分析，初步編制出洪塘大橋維修加固方案，可供有關部門參考。
[Abstract]:Prestressed concrete cable-stayed truss T-frame bridge is a novel bridge structure, composed of cable-stayed structure, truss structure and T-shaped rigid frame. A continuous beam with elastic support is formed, and the horizontal force of the upper chord stiffens the lower chord, and the force is similar to that of the cable-stayed bridge. The axial force of the members is greater than the bending moment, and its members show obvious force characteristics of the two-force rod. The axial force control design is similar to that of the truss bridge. The effect of deadweight and prestress is the largest, and the other load effect is small, which shows the mechanical characteristics of continuous rigid frame. Its weight is light, its stiffness is large, the force is clear and its appearance is beautiful. However, the shear hinge in the middle of the bridge type and the tension and compression bearing in the side span are often destroyed, which affects the safety and use of the bridge structure. It is of great significance to study the disease mechanism and maintenance and reinforcement scheme of this kind of bridge. The main research contents are as follows: This paper takes the Hongtang Bridge in Fujian Province as the research object and establishes the finite element model for the main force components of the prestressed concrete cable-stayed truss T-bridge, including the upper chord, the lower chord, and the web bar. The mechanical properties of T-longitudinal beam and V-shaped pier are analyzed, and the variation of internal force, stress and displacement of members under different load conditions is summarized. 2) based on the field investigation report, the factors causing the damage of prestressed concrete cable-stayed truss bridge T-bridge are analyzed theoretically and sensitively. The disease mechanism under the condition of multi-factor combination was analyzed by orthogonal experiment design. The orthogonal table was calculated by SPSS software, and the importance ranking of sensitivity parameters was put forward. 3) based on the analysis of the damage mechanism and parameter sensitivity of prestressed concrete cable-stayed truss bridge, the maintenance and reinforcement scheme of Hongtang Bridge is worked out, which can be used as a reference for relevant departments.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U445.7;U448.231

【參考文獻】

相關期刊論文 前10條

1 夏永明;斜拉桁架連續(xù)梁的設計與施工——介紹碩放大橋[J];東北公路;1995年01期

2 鄭振,黃鋮;國道316線洪塘大橋結構檢測與狀態(tài)評估[J];福州大學學報(自然科學版);2003年02期

3 漆光榮;林增官;于堅;;預應力混凝土斜拉式桁架T構橋介紹[J];公路;1992年01期

4 杜甫文;斜拉桁架橋的施工實踐與認識[J];公路;1996年05期

5 王蒂;任翔;黃平明;徐建煒;龐志華;;PC桁架連續(xù)剛構橋動力特性研究[J];公路交通科技;2010年01期

6 王文濤，梁奎基;國外大跨徑斜拉橋使用狀況綜述[J];國外公路;1996年06期

7 周履;國外預應力混凝土斜拉板(桿)橋簡介[J];國外橋梁;1994年02期

8 林大云;;T構橋梁施工對連續(xù)剛構橋梁設計的影響研究[J];廣東科技;2013年08期

9 田仲初;黃瑩穎;王博;周瓊;;溫度荷載對PC斜拉橋拉壓支座影響風險識別與分析[J];中外公路;2013年06期

10 于堅;;316國道福州洪塘大橋整治方案探討[J];廣東科技;2008年03期

相關博士學位論文 前2條

1 黃永輝;鋼管混凝土拱橋拱肋病害機理與影響分析及吊桿更換技術研究[D];華南理工大學;2010年

2 陳峰;預應力橋梁結構耐久性與剩余壽命研究[D];長安大學;2011年

本文編號：1448245