项目名称: 拱肋混凝土脱空对钢管混凝土拱桥静力性能的影响
项目编号: No.51308254
项目类型: 青年科学基金项目
立项/批准年度: 2014
项目学科: 建筑科学
项目作者: 云迪
作者单位: 吉林建筑大学
项目金额: 25万元
中文摘要: :钢管混凝土技术被广泛应用于桥梁工程,深受土木工程业界人士青睐。但由于温度荷载、混凝土收缩和徐变等原因导致大多数钢管混凝土拱桥成桥后出现不同程度的脱 空,且脱空随桥梁运营时间的增长日渐严重。脱空机理复杂不同于单纯的钢管与核心混凝土 无粘结,且脱空的存在影响了钢管与核心混凝土的共同工作,原有基于二者共同工作的计算 理论与设计方法是否适用受到质疑。本项目采用试验与理论相结合的方法,主要研究具有不 同脱空缺陷的钢管混凝土拱肋在面内、外复杂荷载工况作用下的静力性能;分析拱肋截面混 凝土脱空高度、拱肋脱空位置及范围对多种常用截面形式的钢管混凝土拱肋刚度、稳定性、 承载力、变形特征及破坏模式的影响;提出可用于脱空钢管混凝土拱桥分析的脱空拱肋简化 计算模型;建立脱空钢管混凝土拱桥的分析与设计方法,实现由拱肋基本性能研究到实践的转化。
中文关键词: 钢管混凝土;拱桥;脱空;稳定承载力;试验
英文摘要: Concrete Filled Steel Tube (CFST) technology is more popular in bridge construction. CFST arch bridges become a favorite choice of engineers. Because of temperature load and shrinkage of the core concrete, most of CFST arch bridges service with separation of CFST arch rib. Furthermore, separation problems will be more serious with the increasing term of service. Separation defects in CFST arch bridge are common and complex, which heavily influence the cooperation of steel tube and core concrete. The former calculation theories and designing methods are unreliable. Static behavior of CFST arch rib with separation defects will be analyzed with both experimental study and theoretical analysis. Influences of the following factors on CFST arch bridges static behavior will be obtained: separation height, separation location and range, section type of arch rib. Research will be focused on stiffness, stability and bearing capacity, deformation behavior of CFST arch rib. Put forward the simplified model of separation arch rib for the analysis of CFST arch bridges with deferent separation. Analysis and design methods of CFST arch rib will be improved. Transformations from basic behavior of arch rib to practical application come true.
英文关键词: concrete filled steel tube;arch bridge;cavity;stability capacity;experiment