曲线连续箱梁桥二维温度梯度效应及设计方法研究

发布时间：2018-03-28 23:24

本文选题：曲线连续梁桥　切入点：二维温度梯度　出处：《长安大学》2014年硕士论文

【摘要】：随着城市道路与高速公路的快速发展，曲线连续梁桥在现代交通中发挥着越来越重要的作用，但是在运营过程中，经常出现径向位移过大、支座脱空和梁体翻转等病害，严重威胁服役安全。曲线连续梁桥设计时往往采用《公路桥涵设计通用规范》（JTGD60-2004）中的温度梯度，即仅考虑竖向温度梯度。本文针对曲线连续箱梁桥在自然环境中存在横向温度梯度，而设计时仅考虑竖向温度梯度的问题，开展了如下研究： 1.基于温度梯度作用效应分析的需要，探讨了温度梯度形成原因以及我国现行规范中温度梯度分布形式，明确了温度梯度作用效应及特点，归纳了桥梁在温度梯度作用下应力与变形分析理论，提出了温度梯度作用效应分析理论的选用原则和方法，确定了本文的研究内容和方法。 2.基于桥梁横向温度梯度的相关研究成果，参照现行公路桥梁规范的温度梯度，根据桥位和桥梁走向，构造了二维温度梯度模式，借助有限元软件ANSYS，分别研究了某匝道桥在规范温度梯度和二维温度梯度作用下的受力与变形；通过计算结果的对比分析，探讨了二维温度梯度效应与规范温度梯度效应的特点，，提出了曲线连续梁桥温度梯度模式的设计建议。 3.基于二维温度梯度作用，探讨了曲线连续箱梁桥钢筋和支座布置的设计方法。分别针对全抗扭支承体系和点铰支承体系提出了多个支座设计方案，通过各方案计算结果的对比分析，提出了全抗扭支承体系和点铰支承体系下，考虑横向温度梯度作用的支座布置最佳设计方法。
[Abstract]:With the rapid development of city road and highway, curved continuous girder bridge plays an increasingly important role in the modern traffic, but in the process of operation, often the radial displacement is too large, bearing cavity and beam body turning and other diseases, serious threat to safety. "General specification for design of highway bridges and culverts > often adopts the design of continuous curve girder bridge (JTGD60-2004) temperature gradient, which only consider the vertical temperature gradient. The continuous curved box girder bridges in the natural environment in the presence of transverse temperature gradient, and the design only considering the vertical temperature gradient, is carried out as follows:
1. based on the analysis of temperature gradient effect, discusses the causes and the temperature gradient in our specification of temperature gradient distribution, the effect of temperature gradient and characteristics, summed up the bridge under temperature gradient stress and deformation analysis of the theory, the analysis of the temperature gradient effect selection principle and method of theory the study determined the content and methods of this paper.
2. based on the relevant research results of bridge transverse temperature gradient, temperature gradient according to the current highway bridge specifications, according to the trend of bridge and bridge structure, the two-dimensional temperature gradient model, using the finite element software ANSYS, respectively on the stress and deformation in the standard temperature gradient and temperature gradient under the action of the two dimension by a ramp bridge; comparison of the calculation results of the analysis, discusses the characteristics of two-dimensional temperature gradient effect and standard temperature gradient effect, this paper suggests the design of curved continuous beam bridge temperature gradient mode.
3. based on the two-dimensional temperature gradient effect, discusses the design method of curved continuous girder bridge reinforcement and bearing arrangement are put forward. A design scheme for the torsion bearing supporting system and hinge bearing point system, through comparative analysis of the calculation results of the proposed scheme, the anti torsion support system and hinge bearing point system the optimal design method of bearing arrangement, considering the effect of transverse temperature gradient.

【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.5;U448.213

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