凤凰三桥钢箱拱肋温度效应研究

发布时间：2018-11-27 12:14

【摘要】：自大跨度桥梁建成以来，国内外研究桥梁温度效应的专家不乏少数，但大部分都集中在混凝土温度效应的研究，针对钢结构温度效应的研究相对较少，至于钢箱拱肋温度效应的研究就更加少之又少了。本文主要基于凤凰三桥钢箱拱肋温度监测结果对其温度效应进分析与研究。凤凰三桥为中承式系杆拱桥，其拱肋是高度比宽度大的高窄钢箱，而且拱肋绕顺桥向存在1/5的旋转角，造成在温度效应下钢箱拱肋产生应力的同时，且各点的位移是空间位移，显然并不类似传统的扁平钢箱梁，其温度效应影响要比普通扁平钢箱梁复杂得多。本文主要内容有：钢箱拱肋温度场的测试；基于温度场的实测数据拟合温度场分布曲线，以适用于温度效应的计算；施工过程中为确保钢拱精准合拢，考虑了温度效应及对策，包括温度作用下拱肋合拢定位坐标的确定，拱肋临时拉索索力的确定；成桥状态下系统温度与温度梯度对吊杆应力和钢拱应力位移的影响及对策，，并对比了四种规范模式与本文拟合温度分布模式下的计算结果。全文以凤凰三桥中承式钢箱系杆拱桥工程为研究背景，针对高难度的大吨位整体提升施工方案，遵循“测试——分析——对策”步骤，全面分析了凤凰三桥的温度效应影响，并利用温度效应解决了工程实践过程中的技术难题，从而更好地为工程建设服务。这一特定的案例必将为其它工程提供借鉴和参考价值。
[Abstract]:Since the construction of the bridge, there are few experts at home and abroad to study the temperature effect of the bridge, but most of them are focused on the temperature effect of concrete, and the research on the temperature effect of steel structure is relatively few. As for the temperature effect of steel box arch rib, the research is even less. Based on the temperature monitoring results of steel box arch rib of Phoenix third Bridge, the temperature effect is analyzed and studied in this paper. Phoenix third Bridge is a middle through tied arch bridge. Its arch rib is a high narrow steel box with large height than width, and the arch rib has a rotation angle of 1 / 5 around the downstream bridge, which results in the stress of the steel box arch rib under the effect of temperature at the same time. The displacement of each point is spatial displacement, which is obviously not similar to the traditional flat steel box girder, and the influence of temperature effect is much more complicated than that of the ordinary flat steel box girder. The main contents of this paper are as follows: testing the temperature field of steel box arch rib, fitting the distribution curve of temperature field based on the measured data of temperature field, so as to apply to the calculation of temperature effect; In order to ensure the precise closure of the steel arch, the temperature effect and its countermeasures are considered, including the determination of the positioning coordinate of the arch rib closure under the action of temperature, and the determination of the temporary cable pulling force of the arch rib; The effects of system temperature and temperature gradient on stress and displacement of suspension rod and steel arch under the condition of bridge completion are discussed and the calculation results of four standard models and the temperature distribution model are compared. Based on the research background of the through steel box tie arch bridge of Phoenix third Bridge, this paper, in view of the high difficulty construction scheme of large tonnage integral lifting, follows the steps of "test-analysis-countermeasure", and comprehensively analyzes the influence of temperature effect on Phoenix third Bridge. The temperature effect is used to solve the technical problems in the process of engineering practice, so as to better serve the engineering construction. This particular case will provide reference and reference value for other projects.
【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U441.5

【参考文献】