本文選題：鋼-混凝土組合梁 + 瞬態(tài)溫度應力�。� 參考：《長安大學》2015年碩士論文

【摘要】：近年來隨著施工技術的不斷進步和新材料的不斷涌現(xiàn),組合結構得到了很大的發(fā)展,比如在超高層建筑中、大跨度橋梁中的應用。其中,鋼-混凝土組合梁發(fā)揮了混凝土與鋼材各自的優(yōu)點,取得了良好的經濟效益,在工程中得到廣泛應用。由于混凝土與鋼的導熱性的差異性,鋼-混凝土組合梁的溫度應力與混凝土結構的溫度應力有著很大的區(qū)別。在溫差荷載作用下,組合梁混凝土翼板內部溫度變化明顯滯后于外界溫度變化;同時混凝土水化熱產生的熱量一部分通過抗剪連接件傳導,與混凝土板接觸的鋼梁也起到了一定的熱量傳導作用。由于不同的溫度梯度的溫度應力相差較大;溫度應力降低截面的抗裂性,影響結構的整體性和耐久性,因此通過現(xiàn)場實測和理論計算得到大跨鋼-混凝土組合梁溫度應力,研究其在溫差荷載作用下溫度應力分布及規(guī)律十分必要。本文以西安某十字路口20m跨度人行天橋(鋼-混凝土組合梁)為工程背景,通過“時間-溫度-應力”測試,對鋼-混凝土組合梁的溫度場進行實測分析。本文采用有限元軟件ABAQUS進行鋼-混凝土組合梁瞬態(tài)溫度場仿真分析,同時考慮抗剪連接件的作用。在建立模型時,采用實體單元類型進行三維全尺寸建模,利用參數(shù)化模型對不同材料屬性的單元賦予不同的參數(shù),添加相應的約束進行計算;可得到這樣的結論:有限元理論分析結果與實際工程擬合較好;組合結構的溫度應力的分布于變截面處的值較大;栓釘?shù)膶嶙饔脤τ阡?混凝土組合梁的溫度場的分布有很大的影響。通過分析溫度應力分布規(guī)律,可以較為直觀的預測其裂縫出現(xiàn)的位置及裂縫的走向。
[Abstract]:In recent years, with the continuous progress of construction technology and the emergence of new materials, composite structures have been greatly developed, such as the application in super-tall buildings and long-span bridges. Among them, steel-concrete composite beams play the respective advantages of concrete and steel, obtain good economic benefits, and are widely used in engineering. Because of the difference of thermal conductivity between concrete and steel, the temperature stress of steel-concrete composite beam is very different from that of concrete structure. Under the action of temperature difference load, the variation of internal temperature of concrete wing slab of composite beam lags behind that of external temperature obviously, and the heat produced by hydration heat of concrete is partly transmitted through shear connection. Steel beams in contact with concrete slabs also play a role in heat transfer. Because the temperature stress of different temperature gradient is quite different, the temperature stress reduces the crack resistance of the section and affects the integrity and durability of the structure, so the temperature stress of the long-span steel-concrete composite beam is obtained by field measurement and theoretical calculation. It is necessary to study the temperature stress distribution and law under the action of temperature difference load. Based on a 20m span footbridge (steel-concrete composite beam) at a crossroads in Xi'an, the temperature field of steel-concrete composite beam is measured and analyzed by time-temperature-stress test. In this paper, the transient temperature field of steel-concrete composite beam is simulated by finite element software ABAQUS, and the effect of shear joint is considered. In the process of building the model, the solid element type is used to model the whole dimension, and the parameterized model is used to assign different parameters to the units with different material properties, and the corresponding constraints are added to calculate the model. It can be concluded that the results of the finite element theory fit well with the actual engineering, the temperature stress of the composite structure is larger than that of the variable section. The thermal conductivity of bolt has great influence on the distribution of temperature field of steel-concrete composite beam. By analyzing the distribution of temperature stress, the location of cracks and the strike of cracks can be predicted intuitively.
【學位授予單位】：長安大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TU398.9

【引證文獻】

相關期刊論文 前1條

1 楊登鋒;;帶鋼斜撐大懸臂鋼混組合結構溫差效應研究[J];中國市政工程;2017年03期

相關碩士學位論文 前1條

1 王耀旭;鋼—混凝土組合梁橋在日照溫度場空間效應下的結構行為研究[D];西南交通大學;2017年

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本文編號：1797259