利用FRP增强高强钢筋混凝土结构的延性机理与试验研究

项目名称： 利用FRP增强高强钢筋混凝土结构的延性机理与试验研究

项目编号： No.50878035

项目类型： 面上项目

立项/批准年度： 2009

项目学科： 交通运输

项目作者： 王苏岩

作者单位： 大连理工大学

项目金额： 34万元

中文摘要： 随着高强混凝土得到普遍的应用，高强混凝土所具有的脆性大、延性差的缺陷日益显现。因此利用FRP增强高强钢筋混凝土结构延性也受到研究人员的广泛关注。基于国家自然科学基金的支持，我们对FRP增强高强钢筋混凝土结构延性机理进行了系统的试验研究和机理分析。通过对FRP增强高强钢筋混凝土方柱延性的试验研究，研发了FRP与夹板组合加固技术，建立了各种影响因素下FRP加固形式、加固量与高强钢筋混凝土柱延性系数的定量关系，提出了FRP增强高强钢筋混凝土柱延性设计方法；对FRP增强高强钢筋混凝土梁(矩形梁和T形梁)延性的试验研究，提出了一种适用于T形梁的锚固约束方式，研究了FRP约束混凝土对高强钢筋混凝土梁塑性铰的形成、发展和塑性铰的长度及其转动能力的影响规律，并建立了FRP加固形式、加固量与高强钢筋混凝土梁延性系数的定量关系，提出了FRP增强高强钢筋混凝土梁延性设计方法；通过对组合FRP约束高强混凝土棱柱体力学性能的试验研究，分析了FRP增强高强钢筋混凝土T形梁的延性机理；此外，还进行了FRP增强高强钢筋混凝土偏心受压柱的力学性能试验研究，对FRP加固大、小偏心受压柱的承载力及延性性能进行了分析。

中文关键词： FPR；高强钢筋混凝土；延性；加固；塑性铰长度

英文摘要： As with the wide use of high strength concrete, the defects of great brittleness and poor ductility become more obvious. So the ductility performance of reinforced high strength concrete structures retrofitted by FRP has attracted wide attention. Just based on the NSFC, experimental studies on ductility mechanism of FRP reinforced high strength concrete structure are systematically carried out.Through the experiment of ductility behavior on the reinforced square high strength concrete columns confined with FRP,a FRP hybridized method is found, the relationships of the ductility ratio of the high strength concrete columns and the strengthening types and amounts of FRP in different affecting factors are established, the ductility design of high strength concrete column confined with FRP is finally given. According to the experiment of ductility of reinforced high strength concrete beams(include rectangular beams and T-section beams)retrofitted with FRP, an effective anchorage measure is proposed for T-section beams, the influences of the FRP confinement on the development of the plastic hinge of the high strength concrete beam are investigated, the relationships of ductility ratio of the high strength concrete beams and the strengthening types and amounts of FRP are established and the ductility design of the high strength concrete beam is obtained. Based on the experiment research on mechanical behavior of high strength concrete prisms confined with hybridized FRP method, the ductility mechanism of reinforced high strength T-section beams retrofitted with FRP is analysed at the end. In addition, ground on the experiment of behaviour of GFRP strengthened reinforced concrete columns under large and small eccentric compression load,the ductility and bearing capacity of the eccentric loading column are also explored.

英文关键词： FRP;high strength reinforced concrete; ductility;strengthening;length of the plastic hinge