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预应力混凝土连续箱梁温度作用的观测与分析研究 【作者】王毅 【导师】叶见曙

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n9T \g:~0预应力混凝土连续箱梁温度作用的观测与分析研究水利论文O-QH;P{^k3e

S&eg1{ v3U4E O0【作者】王毅导师叶见曙
9c)}$ut(x5M@0【作者基本信息】东南大学,桥梁与隧道工程,2006年,博士水利论文"E8f y%Npz ]#|

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T ym[3s0【中文摘要】 混凝土箱梁的温度作用效应直接影响了公路混凝土箱梁桥的安全性。统计资料和研究表明,公路桥梁混凝土箱梁某些部位裂缝是由于温度作用而产生的,其原因是缺乏在系统的观测数据上对混凝土箱梁温度场的深入研究。论文旨在混凝土公路箱梁桥温度场的长期观测数据基础上深入研究并完善公路桥梁混凝土箱梁温度场的理论与计算方法。主要研究内容和成果如下:对一座大跨径公路桥预应力混凝土连续箱梁进行了1年多的连续温度场观测,根据观测的数据,详细分析了在太阳辐射、降温以及春秋季平稳的自然环境下混凝土箱梁各个板件的温度场随时间变化的规律。研究表明,在日气候条件变化下,混凝土箱梁的温度呈正弦曲线变化,周期为24小时。用假设检验和参数估计方法对混凝土箱梁温度场的观测值进行了统计分析,提出了一种根据长期观测数据计算混凝土箱梁温度作用代表值的方法,据此计算了基于观测数据的无沥青混凝土铺装层的混凝土箱梁温度作用的概率模型。经统计分析和假设检验,无沥青混凝土铺装层的混凝土箱梁夏季的日最高温差服从W (9.1327,2.61837)的Weibull分布,冬季服从W (4.4392,2.0749)的Weibull分布。将混凝土箱梁的温度场分...更多析由3维问题简化为2维问题,对混凝土箱梁温度场的时间滞后性进行了研究,提出了计算混凝土箱梁温度变化滞后时间的公式,从理论上证明了混凝土箱梁温度场的变化周期与日气温的变化周期相同,并用数学表达式量化了混凝土箱梁温度变化与环境气温变化的幅值之比及相位差。详细讨论了混凝土箱梁的正温度梯度曲线的影响因素,研究了我国公路桥梁混凝土箱梁的正温度梯度,证明其可以用双折线或指数函数来表达,本文采用指数函数表达混凝土箱梁的正温度梯度。根据计算研究结果,定量的确定了各影响因素与正温度梯度曲线的关系,证明了梗腋高度、太阳辐射强度和日气温变化的幅值是影响混凝土箱梁正温度梯度的重要因素。详细研究了梗腋高度对混凝土箱梁竖向正温度梯度的影响,数据拟合表明,梗腋高度和混凝土箱梁正温度梯度指数函数表达式中参数a呈线性关系。在温度作用下,3跨变高度预应力混凝土连续箱梁的最不利位置位于中跨跨中截面的顶板下表面处,该位置的温度作用效应最大。  还原

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Yy V3O GG|h3Kv"n0【英文摘要】 Temperature action effect affects directly safety of concrete box-girder. Statistical datum and researches have indicated that some cracks of concrete box-girder are caused by temperature action, which results from lack of in-depth research on concrete box-girder temperature field basing on systemic observing datum. Therefore, to research and perfect the theory study and calculating method of temperature field in concrete box-girder basing on long-term observation data is the purpose of this dissertation. The main research content and conclusion of this dissertation are as follows:Continuous observation method is used to observe temperature field in concrete box-girder of a long-span high-way bridge. The change regularity with time is analyzed detailedly for temperature field in each concrete box-girder components in the cases of natural environment, such as solar radiation, temperature drop, and stable natural environment in spring and autumn. Research indicates that under the daily a...更多tmospheric temperature, the curve of concrete box-girder is sinusoid approximately, whose periods is 24 hours.Hypothesis testing and parameter analysis are used for the statistic analysis of temperature field in concrete box-girder. A method for calculating the temperature action representative value is developed according to long-term observation data. Representative value of temperature action is calculated by this method. Hypothesis testing and parameter analysis indicate that daily difference in temperature of concrete box-girder in summer without asphalt concrete cover follows Weibull distribution with parameter 9.1327 and 2.61837, it in winter follows Weibull distribution with parameter 4.4392 and 2.0749.The 3D problem of concrete box-girder temperature field is simplified to 2D problem, and the formulation of the time hysteretic properties of temperature field in concrete box-girder is proposed. It proves in theory that the periods of daily temperature agrees with the periods of concrete box-girder temperature. The range ratio and phasic difference of concrete box-girder temperature to daily temperature is quantitated.The factor influencing positive temperature-gradient-curve of concrete box-girder is discussed detailedly, relative positive temperature-gradient applicable for China is discussed, it proves that positive temperature-gradient can be expressed as exponential and bilinear curve. Moreover, the relation of different factors to positive temperature-gradient is determined quantitatively. It is proved that height of bottom corner of top plate, solar radiation and change range of daily temperature are main impedance factors. Datum fitting indicates that the relationship of height of bottom corner of top plate and parameter a of expression of positive temperature-gradient is linear.The most unfavorable position of three-span prestressed concrete continuous box girder is located at the bottom of top plate of mid-section in the middle span.  还原水利论文NO&[_!T5s&VY"V Dq

xg0a*\[0【中文关键词】 桥梁工程; 混凝土连续箱梁; 温度场; 温度场观测; 参数分析; 温度梯度; 温度作用效应
hvAC-m ],HY0【英文关键词】 bridge engineering; concrete continuous box-girder; temperature field; temperature observation; parametric analysis; temperature gradient; effects of temperature action
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