【作者】 丁洪涛；

【导师】 易伟建； 冼巧玲；

【作者基本信息】 湖南大学 ， 结构工程， 2003， 硕士

【摘要】 近年来采用粘贴碳纤维布(Carbon Fiber Reinforced Polymer，简称CFRP)修复、加固钢筋混凝土结构的新技术，在国际上深受重视并已经获得了较多的应用和发展。本文在广州市建设科技发展基金项目(9908)资助下进行粘贴碳纤维布加固钢筋混凝土柱的试验与研究。 本文完成了23根钢筋混凝土柱的试验研究，研究了粘贴碳纤维布偏压柱承载力和刚度的变化；分析了碳纤维布粘贴对柱延性、裂缝分布及破坏形态的影响；研究了在不同偏心距下碳纤维布的作用发挥程度；比较了不同粘贴方式和不同混凝土强度对加固效果的影响。试验结果表明，大偏心受压柱受拉面纵向粘贴碳纤维布后，偏压柱承载力和抗弯刚度有一定程度的提高，裂缝宽度减小且分布均匀；碳纤维布横向粘贴偏压柱对偏压柱的承载力和延性有一定的提高；纵横向混合粘贴大偏压柱加固效果更显著；混凝土强度低于C20级时，不适合采用碳纤维布粘贴加固。另外本文还研究了碳纤维布锚固方式、粘贴层数对粘贴效果的影响。 本文在平截面假定的基础上分别推导了碳纤维布纵向粘贴大偏心受压柱的正截面承载力校核和截面加固基本计算公式，并对公式进行了相应的简化；运用FORTRAN语言编制相应程序对纵向粘贴碳纤维布大偏压柱进行了数值分析，本文公式计算结果和程序计算结果均与试验结果吻合良好。 此外本文还对碳纤维布约束混凝土的受力性能及影响参数进行了研究。基于碳纤维布有效约束混凝土的面积，在原有箍筋约束混凝土的模型的基础上，提出了碳纤维布约束混凝土棱柱体应力-应变关系模型。在此基础上，编制弯矩-曲率计算程序，对受约束柱截面的弯矩-曲率关系进行了非线性分析，分析了轴压比、包裹碳纤维布层数对约束后截面承载力和曲率延性的影响。编制荷载-挠度全过程计算程序对碳纤维布约束偏压柱进行数值分析，程序计算曲线与试验曲线吻合良好。在忽略混凝土应力路径的影响下，编制相应程序对碳纤维布粘贴钢筋混凝土压弯构件进行了全过程分析及相关参数研究，并把计算结果与试验结果进行了对比，两者吻合较好。更多还原

【Abstract】 In recent years, considerable attention has been focused on the use of carbon fiber-reinforced polymer/plastic (CFRP) for structural rehabilitation and strengthening. Because of many advantages such as high-strength and stiffness-weight ratio, a high degree of chemical inertness, widely applied, convenient construction, CFRP has been popular and praised highly. Necessarily, this paper is engaged to research the behavior of reinforced concrete eccentrically loaded column strengthened with CFRP.Based on the tests of 23 RC columns, the strength capacity, stiffness of the columns strengthened with CFRP have been researched; ductility, the distribution of cracks and failure modes of retrofitted columns have been analyzed.This paper investigated the degree of CFRP function on different eccentricities, and discussed the influence to strengthening effect on the basis of different strengthening mode and concrete strength. Experimental results indicate that the strength capacity, stiffness of columns have a certain extent increasing as a result of the action of CFRP, repaired columns’ cracks show little and distribute uniformly. The ultimate strength and ductility of column improved due to the transverse strengthening with CFRP and display more distinct benefit when strengthened by the combined action of the longitudinal and the transverse straps of CFRP. In addition, Many parameters including anchorage length of CFRP, thickness of CFRP are considered on the effects of CFRP on strength, and failure modes of columns.Based on plane section assumption, this paper presents the methods of calculating the ultimate strength of the columns strengthened with CFRP, and makes a simplification of the methods. A FORTRAN program on nonlinear method is presented to numerically analyze the characteristics of large eccentrically loaded columns strengthened by longitudinal straps of CFRP, calculating results compare well with experimental data.Influential factors and behavior of concrete prism confined with CFRP have been studied, Based on the effective confined concrete area with CFRP, the peak stress and peak strain of CFRP-confined concrete prism depend on , and calculating equation is put forward. On the basis of the stress-strain relationship of steel stirrup-confinedconcrete, a certain stress-stain relationship model of CFRP-confined concrete prism is presented.Behaviors of reinforced concrete columns confined with CFRP have been researched. Based on the progressed stress-strain relation of CFRP-confined concrete, a calculating moment-curvature relationship program is presented; the moment-curvature relationship of CFRP-confined rectangular RC columns was nonlinearly analyzed. The effect of parameters including axial compression ratio, layers of CFRP on the ultimate strength, curvature ductility is discussed. A load-displacement full-process analyzing program of CFRP-confined RC eccentrically loaded columns is given. The computed results of load-displacement coincide with test results.Neglecting the influence of concrete stress-path, relative program is presented to make full-process analysis on compression-flexure members confined with CFRP in the compression zone, a key research is to analyze the effect of some parameters including axial compression ratio, thickness of CFRP, concrete strength on strength capacity and displacement ductility of reinforced compression-flexure members. The theoretical values well agree with test results.更多还原