混凝土箱梁支座位移实验及有效温度计算
发布时间：2018-11-05 11:36
【摘要】：为计算非线性温度分布下桥梁的支座位移,基于单位荷载法基本原理,建立了连续梁支座位移的计算方法和截面有效温度的计算公式。在此基础上,提出了有效温度的5种简化计算方法。为检验计算方法的精度和合理性,以西安沣河大桥这座单箱三室7跨变截面的连续箱梁桥为研究对象,现场实测了箱梁截面的温度和支座位移。实验研究和数值计算结果表明,截面的有效温度与截面的温度分布和截面的形状有关,对于变截面箱梁而言,即使具有相同的温度分布,不同截面的有效温度也是不同的。考虑混凝土的热传导效应,假定混凝土板内温度变化为指数衰减模式计算截面有效温度的加权平均值,所得支座位移误差较小,且偏安全。随后,有限元方法的计算结果进一步表明这种算法的合理性。
[Abstract]:In order to calculate the support displacement of a bridge under nonlinear temperature distribution, based on the basic principle of unit load method, the calculation method of support displacement of continuous beam and the formula of effective temperature of section are established. On this basis, five simplified calculation methods of effective temperature are put forward. In order to test the accuracy and reasonableness of the calculation method, the temperature and support displacement of the section of the box girder are measured on the spot by taking the continuous box girder bridge with a single box, three chambers and seven spans with variable cross-section as the research object. The experimental and numerical results show that the effective temperature of the cross section is related to the temperature distribution of the section and the shape of the section. For the variable section box girder, even if it has the same temperature distribution, the effective temperature of different section is different. Considering the heat conduction effect of concrete, the variation of temperature in concrete slab is assumed to be the weighted average of the effective temperature of the section calculated by exponential attenuation mode, and the displacement error of the bearing is small and the displacement is relatively safe. Then, the results of finite element method further show the rationality of the algorithm.
【作者单位】： 北京科技大学土木工程系;中国水电建设集团十五工程局有限公司;
【基金】：北京市自然科学基金项目(8143037) 北京科技大学教改项目(JG2013M11)
【分类号】：U446.1
本文编号：2311965
[Abstract]:In order to calculate the support displacement of a bridge under nonlinear temperature distribution, based on the basic principle of unit load method, the calculation method of support displacement of continuous beam and the formula of effective temperature of section are established. On this basis, five simplified calculation methods of effective temperature are put forward. In order to test the accuracy and reasonableness of the calculation method, the temperature and support displacement of the section of the box girder are measured on the spot by taking the continuous box girder bridge with a single box, three chambers and seven spans with variable cross-section as the research object. The experimental and numerical results show that the effective temperature of the cross section is related to the temperature distribution of the section and the shape of the section. For the variable section box girder, even if it has the same temperature distribution, the effective temperature of different section is different. Considering the heat conduction effect of concrete, the variation of temperature in concrete slab is assumed to be the weighted average of the effective temperature of the section calculated by exponential attenuation mode, and the displacement error of the bearing is small and the displacement is relatively safe. Then, the results of finite element method further show the rationality of the algorithm.
【作者单位】： 北京科技大学土木工程系;中国水电建设集团十五工程局有限公司;
【基金】：北京市自然科学基金项目(8143037) 北京科技大学教改项目(JG2013M11)
【分类号】：U446.1
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