碳纤维布约束型钢混凝土矩形短柱轴心受压性能研究

项目名称： 碳纤维布约束型钢混凝土矩形短柱轴心受压性能研究

项目编号： No.51208166

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： 高鹏

作者单位： 合肥工业大学

项目金额： 25万元

中文摘要： 根据目前结构加固的现状，本课题拟对碳纤维布约束型钢混凝土矩形短柱轴心受压力学性能进行研究。变化加固组合柱中的负载水平、倒角半径和加固率参数，通过单调静力加载试验，研究其破坏模式和受力机理。之后对加载破坏过程进行非线性有限元模拟和参数分析，探寻负载水平和倒角半径变化下，矩形柱截面中受约束混凝土应力分布和碳纤维布的应变发挥规律，以及构件破坏模式的改变。最后在试验和数值计算基础上进行理论分析，建立考虑负载和倒角半径条件的约束混凝土本构模型，针对负载下的碳纤维布加固型钢混凝土矩形短柱，定义强弱约束加固界限和对应加固率，区分破坏模式，并提出相应设计方法和构造措施。以期为纤维增强复合材料加固钢和混凝土组合结构理论做出贡献。

中文关键词： 碳纤维布；约束；型钢混凝土柱；轴压性能；

英文摘要： According to current research on structural rehabilitation, this project intends to study on axial compressive mechanical performance of steel reinforced concrete rectangular short columns confined by carbon fiber reinorced plastics sheet. By variation of service loading, corner radius and strengthening ratio, axially monotonic static compression tests of strengthened components are finished to explore confinement mechanism and failure modes. Then nonlinear finite element method is used to simulate experimental specimens, more parameters analyses are done after the verification of accurate models, the discipline of concrete stress distributio on column section and the recognition of CFRP sheets hoop orientation working strain are presented, the change of failure modes is also explored. Based on former results, considering the service loading and corner radius, a new constitutive model of steel reinforced concrete confined by CFRP sheets is set up; the boundray between lightly and heavily confined corresponding confinement ratio is defined and failure modes are distinguished; a design method with formulas of ultimate axial compressive bearing capacity of specimens under service loading are provided. This study is aimed for theoretical proposal of CFRP use on strengthening SRC composite structure.

英文关键词： carbon fiber composite sheets；confined；steel reinforced concrete column；axial compressive performance；