钢-混凝土组合结构桥梁温度场及温度效应研究

项目名称： 钢-混凝土组合结构桥梁温度场及温度效应研究

项目编号： No.51478245

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 建筑科学

项目作者： 樊健生

作者单位： 清华大学

项目金额： 90万元

中文摘要： 太阳辐射、气温等环境因素的改变将在桥梁结构中产生显著的温度变化和不可忽略的温度应力，对桥梁设计的安全性和耐久性有重要影响。由于钢和混凝土材料热工参数的差异，钢-混凝土组合结构桥梁的温度场具有自身的特点，采用基于混凝土桥梁温度场理论的温度荷载来计算组合桥的温度响应可能存在较大偏差。本项目计划采用数值模拟、理论推导、模型试验和实桥测试等方法对钢-混凝土组合桥的温度场和温度效应进行研究。首先，建立可反映组合桥梁特征的温度场及结构响应数值模拟平台，得到桥梁的典型温度分布模式。其次，分别在实验室条件和实际桥梁环境下进行温度场测试和温度效应试验，获得的数据可对数值模型进行标定和检验。最后，基于可靠度理论和不同区域的气象特征提出可供设计使用的组合桥梁温度荷载模型，分析多类组合桥的温度响应特征。本项目成果有助于更准确合理认识组合结构桥梁的温度分布模式和结构响应机理，并可供工程设计参考。

中文关键词： 钢-混凝土组合结构；桥梁；试验研究；温度场；温度效应

英文摘要： Remarkable temperature variation and non-ignorable thermal stresses exist in bridges due to the ever-changing environment factors such as solar radiation and ambient temperature. Due to the distinguishing material thermal parameters of steel and concrete, the temperature field of composite steel-concrete bridges has its own characteristics; calculation of the structural responses based on current Chinese bridge design specification, in which the thermal loads was established on temperature field theories of concrete bridges, may lead to bias. This project plans to conduct research on the temperature field and thermal effects of composite steel-concrete bridges, by methods of numerical simulation, analytical research, model tests and bridge temperature observation. Firstly, full-bridge FEM model for thermal field simulation will be established to find the typical worst temperature distribution patterns. Secondly, thermal experiments under laboratory conditions and real environments will be carried on for parametric calibration and results check of the FEM models. Finally, design recommendations for temperature loads of composite bridge will be proposed based on reliability theory. The implement of this project is expected to have guiding significance to promote the design safety and durability level for composite steel-concrete bridge under thermal loads.

英文关键词： composite steel and concrete structures;bridge;experiments;temperature field;thermal response