钢-混凝土组合梁徐变和收缩效应的理论和试验研究

项目名称： 钢-混凝土组合梁徐变和收缩效应的理论和试验研究

项目编号： No.51468026

项目类型： 地区科学基金项目

立项/批准年度： 2015

项目学科： 建筑科学

项目作者： 周东华

作者单位： 昆明理工大学

项目金额： 48万元

中文摘要： 钢-混凝土组合梁发挥了两种材料的受力优势，具有强度高、刚度大、延性好等特点，在土木工程中应用越来越广泛。在长期使用过程中，组合梁中的混凝土板会产生徐变和收缩，在钢梁的约束下将引起截面应力和结构内力重分布，从而导致最终应力状态的改变。怎样来计算组合梁在一系列直接和间接作用下的徐变和收缩效应？目前还缺乏行之有效和简单方便的解析计算方法，对组合梁的徐变和收缩效应（如应力和内力的重分布）的认知也不多和不充分。本项目的研究内容一是从理论上解决组合梁徐变和收缩引起的应力和内力重分布计算问题，尤其是研究简单方便的计算方法，如经项目组的前期研究提出的直接法；二是从试验上对理论研究成果进行验证，同时探寻组合梁的徐变和收缩行为规律。本项目的研究将会推进完善组合梁的计算理论和进一步揭示组合梁在徐变和收缩作用下的复杂受力行为，同时也为今后技术标准的相关内容制定提供理论依据，为工程设计提供有价值的参考和建议。

中文关键词： 钢-混凝土组合梁；徐变；收缩；应力重分布；直接法

英文摘要： Steel - concrete composite beams have the characteristics of high strength, large stiffness and good ductility, etc. for taking advantage of the two materials' mechanical properties. They are more and more widely used in civil engineering. In the process of long-term operation , the concrete slab of composite beams will create creep and shrinkage, which can cause cross-sectional stress and internal force redistribution under the steel beam constraints, and change the final stress states. How to calculate the creep and shrinkage effects on composite beams in a series of direct and indirect action? Currently, there is no effective and simple analytical calculation method, and it is not much and not enough for the awareness of them (such as stress and internal force redistribution). Firstly, the research is theoretically to solve the calculation problem of stress and internal force redistribution caused by the creep and shrinkage effects of composite beams, especially to find simple and convenient methods, such as direct method put forward by the applicants at the early research stage. Secondly, it is to conduct an experiment to verify the theoretical results, and to explore the creep and shrinkage regularity of composite beams. The research will improve the composite beam theory, reveal its complex mechanical behaviors under creep and shrinkage effects, provide theoretical basis for related contents of future technical codes, and offer valuable references and recommends for engineering design. .

英文关键词： steel-concrete composite beam;creep;shrinkage;redistribution of stress;direct method