本文關鍵詞：超高性能混凝土對輕型組合橋面結構疲勞壽命的影響研究　出處：《湖南大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 正交異性鋼橋面 超高性能混凝土 輕型組合橋面板 熱點應力法 應力幅 疲勞壽命 疲勞試驗

【摘要】：正交異性鋼橋面板具有重量輕、承載能力高、施工快、整體性強等優(yōu)點，現(xiàn)已廣泛應用于世界各國大跨徑鋼橋中。然而，大量的工程實踐表明，正交異性鋼橋面板存在兩大技術難題：鋼結構疲勞開裂和鋪裝層損壞。國內外研究人員通過幾十年的探索，進行了很多有益的嘗試，但仍未能從根本上解決上述難題。為此，筆者所在的研究團隊提出將具有高彈性模量、高抗拉強度的配筋超高性能混凝土(Ultra-High Performance Concrete，簡稱UHPC)引入正交異性鋼橋面板中，形成“輕型組合橋面板結構”，以期解決上述兩種病害。 本文基于虎門懸索橋橋面改造工程，對“輕型組合橋面結構”的疲勞性能進行了研究，主要完成了以下工作： （1）綜述了傳統(tǒng)鋼橋面的使用現(xiàn)狀、病害及病害原因，對UHPC材料性能進行介紹，并引入輕型組合橋面結構的概念。 （2）系統(tǒng)全面地綜述了鋼橋疲勞理論：鋼橋抗疲勞設計方法、鋼橋疲勞壽命評估S-N曲線、鋼橋疲勞驗算方法等。闡明了鋼橋面的三大基本體系。 （3）利用ANSYS有限元軟件建立了虎門懸索橋鋼箱梁局部梁段疲勞分析模型。利用熱點應力法，分別對0mm、45mm、60mm厚度UHPC層情形，鋼橋面常見焊接和非焊接易疲勞開裂細節(jié)，進行應力幅計算。并對采用45mm厚度UHPC層的輕型組合橋面板進行了疲勞壽命評估。分析結果表明：輕型組合橋面板中UHPC層對于面板與縱肋連接細節(jié)與縱肋對接細節(jié)，應力幅改善作用很大，而對其余細節(jié)，其改善程度相對較小。采用45mm厚UHPC層時，中車道累計通過8,035,868輛330kN標準疲勞車后，橫隔板與U肋相交處將出現(xiàn)隔板疲勞開裂現(xiàn)象。 （4）基于虎門大橋橋面板條帶足尺模型，設計并開展靜載破壞試驗與疲勞試驗。靜載試驗表明：UHPC材料在開裂后具有應變強化現(xiàn)象，并且表現(xiàn)出很長一段延性；在受拉線彈性設計中，其彈性模量建議取值40.1GPa。疲勞試驗結果表明：在UHPC層應力幅為9.8MPa~24.3MPa的疲勞荷載作用下，歷經3,101,389次疲勞循環(huán)，UHPC層表面未見可視裂縫，，按疲勞極限等效理論換算，此應力幅相當于0.0MPa~21.3MPa，因而UHPC的抗彎拉疲勞強度折減系數(shù)大于0.5，完全能滿足虎門大橋UHPC層的抗彎拉疲勞強度要求。
[Abstract]:The orthotropic steel deck has the advantages of light weight, high capacity, fast construction, has the advantages of strong integrity, is now widely used in the world of long-span steel bridges. However, a large number of engineering shows that there are two major technical problems of Orthotropic Steel Deck: steel structure fatigue cracking and pavement damage. Researchers at home and abroad by exploration of a few years, have a lot of useful attempts, but still failed to fundamentally solve the above problems. Therefore, our research team proposed has high elastic modulus, high tensile reinforcement strength of ultra high performance concrete (Ultra-High Performance Concrete, referred to as UHPC) the introduction of the orthotropic steel deck, the formation of "light the composite bridge deck structure", in order to solve the above two kinds of diseases.
Based on the reconstruction project of Humen suspension bridge deck, the fatigue performance of "light combined deck structure" is studied, and the following work is completed.
(1) the present situation of the use of the traditional steel bridge surface, the causes of disease and disease, the performance of UHPC materials are introduced, and the concept of light combined deck structure is introduced.
(2) systematically summarized the fatigue theory of steel bridges: the design method of fatigue resistance for steel bridges, the S-N curve for fatigue life evaluation of steel bridges, and the fatigue checking method for steel bridges. The three basic systems of steel bridge deck are clarified.
(3) establish the analysis model of steel box girder of Humen suspension bridge local girder fatigue by using finite element software ANSYS. By using hot spot stress method, respectively for 0mm, 45mm, 60mm, UHPC layer thickness, common welded and non welded steel deck fatigue crack details, the stress amplitude is calculated. And the thickness of 45mm layer UHPC the light composite deck were fatigue life assessment. Analysis results show that the lightweight composite bridge deck in UHPC layer for panels with longitudinal ribs and longitudinal rib butt connection details details, stress amplitude is greatly improved, and the rest of the details, the degree of improvement is relatively small. With 45mm thick UHPC layer, Lane cumulative by 8035868 330kN standard fatigue car, the diaphragm and the U rib intersection will appear diaphragm fatigue cracking phenomenon.
(4) the full-scale model of Humen bridge panel strip based on design and carry out static loading test and fatigue test. The static load test showed that the UHPC material with strain hardening phenomenon after cracking, and showed a long pull in ductility; elastic design, the elastic modulus values of the fatigue test results of 40.1GPa. show that the stress amplitude of 9.8MPa~24.3MPa fatigue loading in the UHPC layer, after 3101389 times of fatigue cycle, the UHPC layer was visible cracks, according to the fatigue limit of the theory of equivalent conversion, the stress amplitude is equivalent to 0.0MPa~21.3MPa, so the flexural fatigue strength of UHPC reduction coefficient is greater than 0.5, can fully meet the Humen bridge UHPC the flexural fatigue strength requirements.

【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】：U441;U443.31

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