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

【摘要】：近年來(lái)隨著施工技術(shù)的不斷進(jìn)步和新材料的不斷涌現(xiàn),組合結(jié)構(gòu)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(yīng)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(diǎn),取得了良好的經(jīng)濟(jì)效益,在工程中得到廣泛應(yīng)用。由于混凝土與鋼的導(dǎo)熱性的差異性,鋼-混凝土組合梁的溫度應(yīng)力與混凝土結(jié)構(gòu)的溫度應(yīng)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(nèi)部溫度變化明顯滯后于外界溫度變化;同時(shí)混凝土水化熱產(chǎn)生的熱量一部分通過(guò)抗剪連接件傳導(dǎo),與混凝土板接觸的鋼梁也起到了一定的熱量傳導(dǎo)作用。由于不同的溫度梯度的溫度應(yīng)力相差較大;溫度應(yīng)力降低截面的抗裂性,影響結(jié)構(gòu)的整體性和耐久性,因此通過(guò)現(xiàn)場(chǎng)實(shí)測(cè)和理論計(jì)算得到大跨鋼-混凝土組合梁溫度應(yīng)力,研究其在溫差荷載作用下溫度應(yīng)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(guò)“時(shí)間-溫度-應(yīng)力”測(cè)試,對(duì)鋼-混凝土組合梁的溫度場(chǎng)進(jìn)行實(shí)測(cè)分析。本文采用有限元軟件ABAQUS進(jìn)行鋼-混凝土組合梁瞬態(tài)溫度場(chǎng)仿真分析,同時(shí)考慮抗剪連接件的作用。在建立模型時(shí),采用實(shí)體單元類型進(jìn)行三維全尺寸建模,利用參數(shù)化模型對(duì)不同材料屬性的單元賦予不同的參數(shù),添加相應(yīng)的約束進(jìn)行計(jì)算;可得到這樣的結(jié)論:有限元理論分析結(jié)果與實(shí)際工程擬合較好;組合結(jié)構(gòu)的溫度應(yīng)力的分布于變截面處的值較大;栓釘?shù)膶?dǎo)熱作用對(duì)于鋼-混凝土組合梁的溫度場(chǎng)的分布有很大的影響。通過(guò)分析溫度應(yīng)力分布規(guī)律,可以較為直觀的預(yù)測(cè)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(xué)位授予單位】：長(zhǎng)安大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TU398.9

【引證文獻(xiàn)】

相關(guān)期刊論文 前1條

1 楊登鋒;;帶鋼斜撐大懸臂鋼混組合結(jié)構(gòu)溫差效應(yīng)研究[J];中國(guó)市政工程;2017年03期

相關(guān)碩士學(xué)位論文 前1條

1 王耀旭;鋼—混凝土組合梁橋在日照溫度場(chǎng)空間效應(yīng)下的結(jié)構(gòu)行為研究[D];西南交通大學(xué);2017年

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本文編號(hào)：1797259