【作者】 欧添雁；

【导师】 卢亦焱；

【作者基本信息】 武汉大学 ， 结构工程， 2004， 硕士

【摘要】 粘贴碳纤维布和外包钢加固混凝土结构已经在工程上得到大量应用。碳纤维布有强度高、弹模大、耐腐蚀、施工简便快捷等优点。外包钢可以直接受力，而且延性好。把碳纤维布和角钢复合起来加固钢筋混凝土短柱，研究表明可以取得良好的加固效果。但是采用碳纤维布和角钢复合加固钢筋混凝土中长柱的性能国内外研究很少。 基于上述分析，本次试验总共浇筑了12根长细比为8、10、12、15的中长柱。对长细比为8的柱进行未加固、包碳纤维布、外包钢、外包钢与碳纤维布复合加固对比试验。其它试件采取改变碳纤维布、角钢、箍板密度参数对比试验。通过对柱的轴心受压试验观察分析柱的受力性能和破坏形态，并结合中长柱的有关理论，主要探讨长细比、角钢量、碳纤维布量以及箍板量对外包钢与碳纤维布复合加固混凝土中长柱承载力及其他性能的影响。 试验结果表明：外包钢与碳纤维布复合加固能显著提高混凝土中长柱的承载力和延性；复合加固后，外包角钢量越多，碳纤维布发挥的作用越大；长细比越小外包钢与碳纤维布复合加固效果越好，长细比大于一定值后复合加固柱荷载下降的速度比普通混凝土柱快；箍板的密度对复合加固中长柱的影响比复合加固短柱的影响大。 在理论分析的基础上，本文给编制了全过程分析程序进行数值模拟计算。全过程分析得到的荷载—挠度曲线与试验得到的荷载—挠度曲线吻合较好。 另外，结合折合模量理论，提出了外包角钢与碳纤维布中长柱折合模量计算公式。在分析复合加固混凝土短柱承载力计算公式的基础上，提出外包角钢与碳纤维布复合加固中长柱稳定系数公式，该稳定系数考虑长细比、碳纤维布量、角钢量以及箍板量四个影响承载力主要因素，在给出的稳定系数的基础上，提出外包角钢与碳纤维布复合加固混凝土中长柱承载力计算公式。折算模量理论得到的计算结果和简化计算结果与试验结果吻合较好。更多还原

【Abstract】 Retrofitting and strengthenin of RC structures by fiber-wrapping and steel-bonding have become very popular. A satisfactory conclusion of the short columns strengthened with a combination of the two materials is acquired for the merits of Carbon Fiber reinforced plastic (CFRP) include anti-corrosion, lightweight and low manpower for application, as well as high strength and high elastic modulus, and angle steel resisting compression direct and good ductility, but it not be seen in foreign and native literature that the long concrete columns are strengthened with the combination of the two materials.Basis on the analysis above, 12 columns are studied in the experiment whose slenderness ratio were 8,10,12,15. Columns slenderness ratio of 8 are under different strengthening conditions of unstrengthen, fiber-wrapping, steel-wrapping and wrapping with a combination of the two materials. Other columns strengthened with a combination of the two materials by changing the parameter of CFRP, angle steel and "stirrup" plate. Ultimate load and failure mode were measured and observed. This paper mainly study the effect of changing the parameter of CFRP, angle steel and "stirrup" plate on the ultimate load and other behavior of the columns strengthened with the combination of the two materials.The result of experiment shows that wrapping CFRP and angle steel can significantly improve the resisting load-compression capacity and ductility of member. It also indicate that the more angle steel wrapping the fuller the strengthen of CFRP has been used, and the effect of strengthening greatly depend on the slenderness ratio, the load drop greater than that of contrast if the slenderness ration is larger than a certain one. Compared to short columns strengthened with the combination of CFRP and angle steel ,the factor of stirrup spacing affects the load of long columns greater.Based on the theoretical analysis, an available analytical proceduce is presented . The load梔isplacement curves that calculated from the full-course analysis program are in accordance with the results of experimental.In the terms of the Reduced Modulus Theory, formulation of calculation is established. Based the analysis of formulation of calculating short RC columns strengthened with the combination of CFRP and angle steel, a method of analyses of stability of bearing capacity of long RC columns strengthened with the combination of CFRP and angle steel is presented, in which various parameters, such as slenderness ration, quantity of CFRP and angle steel, space of "stirrup"plate, have been considered, the calculating results of both methods cohere to the experimental results well.更多还原