CFRP约束钢管高强混凝土柱的约束机理与设计方法研究

项目名称： CFRP约束钢管高强混凝土柱的约束机理与设计方法研究

项目编号： No.51308201

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： 秦鹏

作者单位： 湖南大学

项目金额： 25万元

中文摘要： 钢管高强混凝土结构技术是解决钢筋混凝土高层建筑"胖柱"问题和增大桥梁结构跨越能力的经济而有效的措施，在高层建筑与大跨桥梁工程中得到了卓有成效的应用。但采用高强混凝土会使钢管混凝土柱的脆性增大，而高强薄壁钢管的应用会导致钢管局部稳定问题变得突出。基于上述工程背景，本项目重点研究CFRP约束钢管高强混凝土柱的力学性能和工作机理。本项目拟发挥硅压阻式压力计的优势，提出基于核心混凝土轴向应力与约束应力的测试新方法，建立核心混凝土被动约束模型，揭示钢管约束延迟核心混凝土出现剪切滑移破坏的机理。通过轴心受压试验揭示CFRP约束钢管高强混凝土的约束机理，建立CFRP约束参数与套箍率的数学关系，确定破坏模态转化的临界值。进行压弯试验，揭示CFRP对钢管高强混凝土压弯构件的约束机理，获得CFRP约束对提高承载力和延性的规律。提出基于性能的CFRP约束钢管高强混凝土的分析与设计方法用于指导工程实践。

中文关键词： 钢管高强混凝土；CFRP约束钢管混凝土柱；精细化有限元模型；参数分析；计算方法

英文摘要： High-strength concrete-filled steel tube technology is an economic and effective method to solve "fat column" problem in reinforced concrete high-rise buildings and to increase the spanning capacity of bridge structure, by which it is widely used in high-rise buildings and long-span bridges . However, using of high-strength concrete will increase brittleness in CFT columns, and the application of high-strength thin-walled steel tube will result in local stability issues. Based on the above engineering background, the project will focus on mechanical properties and working mechanism of CFRP confined high-strength concrete-filled steel tube columns. This Project will take advantage of the silicon piezoresistive pressure gauge and propose a new test method based on axial stress and confinement stress of core concrete.The passive confinement model will be established , and the mechanism of shear slip failure of core concrete being delayed by confinement from steel tube will be revealed. Through axial compression test, the confinement mechanism of CFRP confined high-strength concrete-filled steel tube will be revealed, and the mathematical relationship of the CFRP confinement parameters and confinement coefficient will be established. Then, compression-bending tests will be conducted to reveal the confined mechanism

英文关键词： High-strength concrete of CFT；CFRP confined concrete filled steel tube columns；Finite element analysis (FEA) model；Parameter analysis；Calculation method