| 钢-混凝土组合梁桥的温度梯度作用——地域差异与等值线地图 |
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| 引用本文： | 刘江,刘永健,马志元,吕毅.钢-混凝土组合梁桥的温度梯度作用——地域差异与等值线地图[J].中国公路学报,2023,36(1):135-149. |
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| 作者姓名： | 刘江 刘永健 马志元 吕毅 |
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| 作者单位： | 1. 长安大学 公路学院, 陕西 西安 710064;2. 长安大学 公路大型 结构安全教育部工程研究中心, 陕西 西安 710064 |
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| 基金项目： | 国家自然科学基金项目（52108111，51978061）；中国博士后科学基金项目（2021M692747）；中央高校基本科研业务费专项资金项目（300102212102，300102219310）；陕西省交通运输厅科研项目（17-14k） |
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| 摘 要： | 为研究组合梁桥温度梯度作用取值的地域差异性，搜集了全国839个气象站的长期历史气象数据，建立了全国91个辐射气象站（有太阳辐射历史数据）太阳辐射预测的Bahel模型，补充了748个常规气象站（无太阳辐射历史数据）各23年的太阳日辐射总量数据。在这些气象数据的基础上，提出了温度作用代表值等值线地图的“逐层绘制法”，该方法首先采用有限元温度场长期计算和气象相关性经验公式分别得到91个辐射气象站和748个常规气象站的温度作用样本数据，随后基于广义帕累托分布（GP分布）的超阈值模型求得各气象站的温度作用代表值，最后，采用空间插值方法绘制各温度作用代表值的等值线地图。采用上述方法，绘制了组合梁桥温度梯度升温模式1、升温模式2和降温模式中各温差代表值的等值线地图。研究结果表明：Bahel模型在中国范围内具有很好的适用性，可用于太阳辐射数据的准确预测和补充；中国组合梁桥各温差存在显著的地域差异性，最大可达到27.89℃，若在一个较大的区域内选取一恒定温差作用取值会明显低估了这种地域差异性；“逐层绘制法”概念清晰，操作方便，是进行温度作用等值线地图绘制的有效方法；所绘制的50年回归期温差代表值等值线地图，可用于全国范围内组合梁桥温度梯度作用的准确取值，所提供的温差数据具有概率统计意义，较现行规范更能满足极限状态设计法的基本要求，对于中国组合梁桥的精细化设计和规范体系的补充具有重要价值。
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| 关 键 词： | 桥梁工程 钢-混凝土组合梁桥 温度梯度模式 等值线地图 温差代表值 地域差异性 历史气象数据 |
| 收稿时间： | 2021-02-04 |
Temperature Gradient Action of Steel-concrete Composite Girder Bridge: Regional Difference and Isoline Map |
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| LIU Jiang,LIU Yong-jian,MA Zhi-yuan,LYU Yi.Temperature Gradient Action of Steel-concrete Composite Girder Bridge: Regional Difference and Isoline Map[J].China Journal of Highway and Transport,2023,36(1):135-149. |
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| Authors: | LIU Jiang LIU Yong-jian MA Zhi-yuan LYU Yi |
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| Affiliation: | 1. School of Highway, Chang'an University, Xi'an 710064, Shaanxi, China;2. Research Center of Highway Large Structure Engineering on Safety, Ministry of Education, Chang'an University, Xi'an 710064, Shaanxi, China |
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| Abstract: | To study the regional differences in temperature gradient actions of composite girders and based on long-term historical meteorological data collected from 839 weather stations in China, the Bahel model of 91 radiation weather stations (with solar radiation data) was established, and the daily total solar radiation data of 748 regular weather stations (without solar radiation data) for 23 years were supplemented further. By using these meteorological data, a "layer-by-layer drawing method" was put forward for the isoline map of the temperature action representative value. In this method, the temperature action samples of 91 radiation weather stations and 748 regular weather stations were first obtained by long-term calculations using the finite-element method and meteorological correlated empirical formula, respectively. Then, the temperature action representative values of each weather station were obtained based on the superthreshold model of the generalized Pareto distribution. Finally, the isoline map of each temperature action was drawn using spatial interpolation. Using the above method, temperature difference isoline maps were drawn for Heating Pattern 1, Heating Pattern 2, and the cooling pattern of composite girder bridges. The research results show that the Bahel model has good applicability in China and can be used for accurate prediction of and to supplement solar radiation data. There are significant regional differences in the temperature difference of composite girder bridges in China, the maximum value of which can reach 27.89℃. If a certain value is selected in a large area, this regional difference will be underestimated. The concept of the layer-by-layer drawing method is clear and easy to implement, and it is demonstrated to be an effective method for drawing a temperature difference isoline map. An isoline map with a representative value of temperature difference in a 50-year return period can be used to provide an accurate and nationwide value for the temperature gradient of composite girder bridges. Compared with the current specification, the temperature difference data provided can meet the basic requirements of the limit state design method, which is of great value for the refined design of composite girder bridges in China, and to supplement the specification system. |
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| Keywords: | bridge engineering steel-concrete composite girder bridge temperature gradient pattern isoline map representative value of temperature difference regional differences historical meteorological data |
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