大跨度钢桁梁斜拉桥温度效应分析
发布时间：2018-12-13 01:25
【摘要】：长时间暴露在太阳辐射以及环境因素下的桥梁结构由于温度变化而引起非线性温度分布不均匀,会造成显著温度效应的影响。研究表明,随时间变化的温度载荷作用下,大跨度桥梁将产生非常严重温度效应：当温度变化引起的频率变化达到4%时,结构刚度响应将达到8%的变化。在强烈的温度荷载的作用下,大型桥梁结构在使用期时同样易于引起强烈的非线性热效应,因此会导致非常严重的应力集中以及变形,这会进一步导致桥梁结构发生退化甚至损伤,进一步削弱桥梁的作用,不能满足其适用性和耐久性。在某些情况下,可变温度引起的结构载荷并不比常规使用的荷载弱,并且在某些情况下,甚至决定着结构安全。本文以新疆果子沟首座公路斜拉桥为工程背景,对新疆严寒地区桥梁结构受到温度影响时的力学行为进行分析。首先介绍了斜拉桥,以及研究目的、意义,以及工程的背景和研究方法的现状与发展。搜集了国内外文献对温度研究的深度,在理论研究、实测研究以及目前较为关注的问题做以详细的阐述,并整理了各国公路桥涵规范对温度作用的影响规定。对桥梁温度荷载的形成原因、主要影响因素、分类及特点一一论述,并介绍了目前较为常用的温度荷载理论计算公式。介绍了以果子沟大桥为工程依托的Midas/Civil钢桁梁模型建立,并简要介绍Midas/Civil软件在温度分析方面的功能和分类,采用升高钢桁梁上部温度模拟太阳垂直照射钢桁梁时,钢桁梁本身、索塔、斜拉索应力、位移、变化值并进行细致分析,得到一定结论。对国内桥梁墩塔温度作用的研究进展和温度应力计算理论做简单介绍,并依托果子沟斜拉桥为工程背景建立索塔温度模型,按照规范进行三种工况下索塔自身、对钢桁梁、斜拉索索力影响都做了详细计算分析并得出一定结论。讨论了年均匀温差和体系温差对桥梁的影响,通过对比索塔,主梁,斜拉索索力影响得出相关结论。
[Abstract]:The nonlinear temperature distribution of bridge structures exposed to solar radiation and environmental factors for a long time is uneven due to temperature variation, which will cause significant temperature effects. The results show that the temperature effect of the long-span bridge will be very serious under the influence of temperature load with time: when the frequency change due to the temperature change reaches 4, the stiffness response of the structure will reach 8% change. Under the action of strong temperature load, the large bridge structure is easy to cause strong nonlinear thermal effect in the service life, so it will lead to very serious stress concentration and deformation. This will further lead to the degradation or damage of bridge structure, further weaken the role of bridge, and can not meet its applicability and durability. In some cases, the structural load caused by variable temperature is not weaker than the conventional load, and in some cases, it even determines the safety of the structure. Based on the engineering background of the first highway cable-stayed bridge in Jiegou, Xinjiang, the mechanical behavior of the bridge structure under the influence of temperature is analyzed in this paper. At first, the paper introduces the cable-stayed bridge, the purpose and significance of the research, the background of the project and the present situation and development of the research methods. The depth of temperature research in domestic and foreign literature is collected, the theoretical research, the actual measurement research and the problems concerned at present are elaborated in detail, and the influence regulations of highway bridge and culvert codes on the effect of temperature in various countries are sorted out. In this paper, the causes, main influencing factors, classification and characteristics of the temperature load of the bridge are discussed, and the theoretical formulas of the temperature load are introduced. This paper introduces the establishment of Midas/Civil steel truss model based on Shuigou Bridge, and briefly introduces the function and classification of Midas/Civil software in temperature analysis. When the upper temperature of steel truss beam is raised to simulate the vertical sun irradiating steel truss beam, The stress, displacement and variation of steel truss itself, cable tower and cable are analyzed and some conclusions are obtained. This paper briefly introduces the research progress and the theory of temperature stress calculation of bridge pier tower in China, and establishes the temperature model of cable tower based on Shuigou cable-stayed bridge for engineering background. According to the code, the temperature model of cable tower is established under three working conditions, and the steel truss beam is made. The influence of cable-stayed cable force is calculated and analyzed in detail and a certain conclusion is drawn. The effects of annual uniform temperature difference and system temperature difference on the bridge are discussed.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.5;U448.27
本文编号：2375608
[Abstract]:The nonlinear temperature distribution of bridge structures exposed to solar radiation and environmental factors for a long time is uneven due to temperature variation, which will cause significant temperature effects. The results show that the temperature effect of the long-span bridge will be very serious under the influence of temperature load with time: when the frequency change due to the temperature change reaches 4, the stiffness response of the structure will reach 8% change. Under the action of strong temperature load, the large bridge structure is easy to cause strong nonlinear thermal effect in the service life, so it will lead to very serious stress concentration and deformation. This will further lead to the degradation or damage of bridge structure, further weaken the role of bridge, and can not meet its applicability and durability. In some cases, the structural load caused by variable temperature is not weaker than the conventional load, and in some cases, it even determines the safety of the structure. Based on the engineering background of the first highway cable-stayed bridge in Jiegou, Xinjiang, the mechanical behavior of the bridge structure under the influence of temperature is analyzed in this paper. At first, the paper introduces the cable-stayed bridge, the purpose and significance of the research, the background of the project and the present situation and development of the research methods. The depth of temperature research in domestic and foreign literature is collected, the theoretical research, the actual measurement research and the problems concerned at present are elaborated in detail, and the influence regulations of highway bridge and culvert codes on the effect of temperature in various countries are sorted out. In this paper, the causes, main influencing factors, classification and characteristics of the temperature load of the bridge are discussed, and the theoretical formulas of the temperature load are introduced. This paper introduces the establishment of Midas/Civil steel truss model based on Shuigou Bridge, and briefly introduces the function and classification of Midas/Civil software in temperature analysis. When the upper temperature of steel truss beam is raised to simulate the vertical sun irradiating steel truss beam, The stress, displacement and variation of steel truss itself, cable tower and cable are analyzed and some conclusions are obtained. This paper briefly introduces the research progress and the theory of temperature stress calculation of bridge pier tower in China, and establishes the temperature model of cable tower based on Shuigou cable-stayed bridge for engineering background. According to the code, the temperature model of cable tower is established under three working conditions, and the steel truss beam is made. The influence of cable-stayed cable force is calculated and analyzed in detail and a certain conclusion is drawn. The effects of annual uniform temperature difference and system temperature difference on the bridge are discussed.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.5;U448.27
【参考文献】
相关期刊论文 前1条
1 樊启武;钱永久;;采用间接耦合法分析斜拉桥索塔瞬态温度应力场[J];石家庄铁道学院学报(自然科学版);2008年01期
，本文编号：2375608
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