钢-混凝土组合梁的非线性与徐变耦合效应研究

项目名称： 钢-混凝土组合梁的非线性与徐变耦合效应研究

项目编号： No.51208431

项目类型： 青年科学基金项目

立项/批准年度： 2013

项目学科： 建筑环境与结构工程学科

项目作者： 占玉林

作者单位： 西南交通大学

项目金额： 25万元

中文摘要： 使用服役期内，钢-混凝土组合梁会由于混凝土开裂、界面滑移、荷载改变及边界变化等而产生非线性行为；徐变是混凝土的固有属性，混凝土的徐变变形会由于受到钢梁的约束而产生附加截面应力。同时存在的非线性和徐变效应之间具有相互耦合的特点，会使结构的受力状态变得更为复杂，研究非线性与徐变耦合效应对于探明钢-混凝土组合梁的受力机理具有十分重要的意义。围绕钢-混凝土组合梁非线性与徐变耦合这一前沿课题，采用概率统计方法对非线性参数进行统计分析；并研究成熟徐变本构模型在钢-混凝土组合梁中的适应性问题；根据流变力学理论原理，采用阶段逐步积分方法进行非线性与徐变的耦合问题探索。通过理论分析、数值研究、试验验证探明在正常使用状态下，钢-混凝土组合梁非线性与徐变耦合的基本特征。本项目研究成果可为钢-混凝组合梁设计理论、施工控制决策和营运养护管理提供科学依据和理论支撑，具有重要的理论意义和工程应用价值。

中文关键词： 钢-混凝土组合梁；非线性；徐变；耦合；结构行为

英文摘要： In the process of servicability stage, nonlinear performances of steel-concrete composited beams will be taken place because of the crack of concrete, inerface slip between steel and concrete, loading or boundary conditions be changed. It was well known that the creep is inherent attribute of concrete material, the trend for creep deformance will be constrained by steel girder for they have different creep properties, so this will cause secondary stress in the composited section. The stress state of steel-concrete composited beam would be more complex because of the coupled relationship between nonlinearity and creep, so it is very meaningful to deep study these coupled performances. This perpose of this project is mainly study the coupled relationship between nonlinearity and creep of steel-concrete composited beam. Firstly, the probabilistic method will be introduced to anlysis the nonlinear parameters. Secondly, study a lot of classical creep models to modify the creep parameters for analysis the creep performance of steel-concrete composited beam. Thirdly, the step-by-step Integration model based on the rheological mechanics will be obtained to study the coupled relationships. The coupled performances of the steel-concrete composited beam under servicability state will be gotten by these theoretical analys

英文关键词： steel concrete composite beam；nonlinearity；creep；couple；structure performance