本文選題：高速鐵路　切入點：混凝土箱梁　出處：《中南大學》2014年碩士論文

【摘要】：摘要：橋梁在與外界環(huán)境的熱交換過程中,受到太陽直接照射、對流換熱、輻射換熱的作用,梁體內產生非線性的溫度場,影響橋梁結構的安全性。隨著我國高速鐵路的發(fā)展,溫度效應問題突出表現(xiàn)在：1.軌道結構與橋梁結構互相影響,系統(tǒng)內溫度場問題復雜,但我國相關規(guī)范未考慮無砟軌道對橋面的遮擋作用；2.隨著大跨度鋼橋的發(fā)展,溫度效應已經成為關乎大跨度鋼橋列車走行性的重要課題,而目前對鋼橋溫度荷載的規(guī)定尚不完善。因此有必要對鋪設無砟軌道混凝土橋梁及鐵路大跨度鋼橋的溫度效應及溫度模式加以研究。 本文以某32m預應力簡支箱梁橋和滬通長江公鐵兩用大橋為工程背景,主要研究工作如下： (1)基于ANSYS大型通用有限元軟件,以熱流密度作為模擬未鋪設CRTS Ⅱ型板式無砟軌道簡支梁的熱邊界條件,分析其溫度場的時變規(guī)律,并與實測數據進行對比,驗證了計算結果的準確性。 (2)建立了鋪設CRTS Ⅱ型板式無砟軌道的混凝土簡支梁熱力學模型,進行了考慮無砟軌道遮擋后箱梁橋的溫度場效應研究,探討了設CRTS Ⅱ型板式無砟軌道箱梁的日照溫度分布規(guī)律。 (3)對CRTS Ⅱ型板式無砟軌道箱梁典型時刻的溫度自應力分布規(guī)律進行了分析,提出了橫、豎向溫度梯度模式。與各國規(guī)范關于豎向溫度梯度分布的進行了對比,證明本文所得溫度梯度曲線較為合理。 (4)以滬通長江公鐵兩用大橋為工程背景,建立大跨度鋼桁橋雙層橋面熱力學模型,考慮了公路橋面對鐵路橋面的遮擋效應,進行了溫度場效應研究,初步探討了大跨度鋼桁架橋的日照溫度分布規(guī)律。
[Abstract]:Abstract: the bridge in exchange with the external environment in the process of heat, by direct solar radiation, heat convection, heat radiation effect, temperature field of nonlinear beam, affect the safety of bridge structure. With the development of high-speed railway in China, the temperature effect of outstanding performance in: 1. track and bridge the structure of mutual influence, problems in temperature field is complex, but the relevant norms of our country did not consider the ballastless track on bridge deck shelter effect; 2. with the development of large span steel bridge, the temperature effect has been related to large span steel bridge train for the important subject, and the current provisions of the steel bridge temperature load is not perfect. Therefore it is necessary to study the temperature effect of laying ballastless track concrete bridges and railway long span steel bridge and temperature model.
In this paper, the main research work is as follows: a 32m prestressed simple supported box girder bridge and the Shanghai Tong Changjiang River dual-purpose bridge as the engineering background.
(1) based on the ANSYS general finite element software, taking the heat flux as the thermal boundary condition for simulating the simply supported beam of CRTS II slab ballastless track, the time-varying law of the temperature field is analyzed, and the accuracy of the calculation results is verified by comparing with the measured data.
(2) a thermodynamic model of concrete simply supported beam laying CRTS II slab ballastless track is established. The temperature field effect of box girder bridge after ballastless track occlusion is studied. The rule of sunshine temperature distribution for CRTS II slab ballastless track box girder is discussed.
(3) the thermal stress distribution law of typical moment ballastless track box beam of CRTS type plate are analyzed, put forward the horizontal and vertical temperature gradient mode. With all the specifications on the vertical temperature gradient distribution were compared, show that this temperature gradient curve is more reasonable.
(4) in Shanghai Yangtze River Tianxinzhou bridge as the engineering background, the establishment of a thermodynamic model of double deck large span steel truss bridge, the highway bridge face the shielding effect of railway bridge, the effect of temperature field, discussed the temperature of long-span steel truss bridge of the distribution.

【學位授予單位】：中南大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：U441.5

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本文編號：1712077