考虑温度和湿度变化的钢-混组合连续梁桥徐变效应分析

发布时间：2018-04-26 16:16

本文选题：混凝土徐变 + 环境温度　；参考：《中南大学学报(自然科学版)》2015年07期

【摘要】：针对现有规范徐变模型中环境温度和相对湿度未根据实际温度和湿度变化而取固定值的问题,通过研究桥梁实际变化的环境温度和相对湿度,构建环境温度和相对湿度变化函数,嵌入CEB-FIP 90徐变模型,建立考虑混凝土桥梁实际工作环境的温湿变化徐变模型,并通过试验数据验证模型的正确性。研究结果表明:考虑温度和湿度变化的徐变系数与试验值更吻合;采用数值模拟的方法开展港珠澳大桥组合连续梁桥徐变效应分析,明确了成桥10 a间温度和湿度变化对组合连续梁桥的最大应力和长期变形的影响规律,温湿变化徐变模型计算的最大挠度比规范值大10%以上,这表明考虑温度和湿度变化计算徐变的必要性,为合理、可靠进行桥梁结构的徐变效应分析提供了一种新方法。
[Abstract]:In order to solve the problem that the environmental temperature and relative humidity are not fixed according to the change of actual temperature and humidity in the existing code creep model, the actual environmental temperature and relative humidity of the bridge are studied. The change function of temperature and relative humidity in environment is constructed, and the creep model of CEB-FIP 90 is embedded in the creep model of concrete bridge. The creep model of temperature and humidity changes considering the actual working environment of concrete bridge is established, and the correctness of the model is verified by the experimental data. The results show that the creep coefficient considering the variation of temperature and humidity is in better agreement with the experimental value, and the creep effect of the composite continuous girder bridge of HongKong-Zhuhai-Macao Bridge is analyzed by numerical simulation. The effect of temperature and humidity on the maximum stress and long-term deformation of composite continuous beam bridge during 10 years is clarified. The maximum deflection calculated by the creep model of temperature and humidity changes is more than 10% larger than the standard value. This indicates that it is necessary to calculate creep by considering the variation of temperature and humidity, which provides a new method for the analysis of creep effect of bridge structure.
【作者单位】：武汉理工大学道路桥梁与结构工程湖北省重点实验室;
【基金】：高等学校博士点基金(新教师类)资助项目(20120143120017) 湖北省自然科学基金资助项目(2014CFB847) 中央高校专项资金资助项目(2014-IV-087)~~
【分类号】：U441

【参考文献】