【作者】 陈少雄；

【导师】 卢亦焱；

【作者基本信息】 武汉大学 ， 结构工程， 2004， 硕士

【摘要】 碳纤维布与角钢复合加固混凝土弯压构件是一种新的加固形式。在其运用到结构抗震加固时，必须保证加固构件具有良好的延性破坏机制，为此本文进行了七个复合加固弯压试件的抗震性能的试验研究，并评估加固效果。 本文具体的作了一下几个方面的研究工作： 首先总结了国内建筑物修复加固的发展与现状，回顾了已经应用较成熟的建筑物加固方法，综述了外包钢及碳纤维布加固技术在国内外的研究与应用进展，并介绍了碳纤维布及粘结材料的力学特性与工程应用要求。 考虑轴压比、角钢用量、碳纤维布加固量等参数，对七根碳纤维布与角钢复合加固混凝土弯压柱进行低周反复试验。文中具体地介绍了试件的制作，试验过程以及试验现象，详细分析了试验现象；通过对比，确定不同加固方案抗震性能的差异。通过滞回曲线、骨架曲线分析各参数对构件滞回性能。骨架曲线形状、弹性刚度、延性等的影响。结果表明，与未加固柱相比，碳纤维布与角钢复合加固后弯压柱的极限承载力、延性和耗能性能均有大幅提高。与仅用外包角钢加固柱相比，复合加固柱的抗震性能亦得到改善。 在确定钢材和核心混凝土在往复荷载作用下的应力—应变关系模型的基础上，对碳纤维布与角钢复合加固混凝土压弯构件P—△滞回关系曲线和单调曲线进行了理论分析，将试验所得的P—△关系曲线与数值计算结果进行比较，吻合良好；并通过数值计算的荷载—位移单调曲线，分析轴压比、碳纤维布加固量、混凝土强度。等参数对碳纤维布与角钢复合加固混凝土压弯构件的P—△关系曲线的影响。更多还原

【Abstract】 It is a new form of reinforcement for concrete structure to strengthen them with combination of bonded steel angles (BSA) and carbon fiber reinforced polymer sheet(CFRP) ,which must be proved safe and functional in rehabilitation and strengthening of concrete structure .Based on this purpose, Seven reinforced concrete columns strengthened with combination of bonded steel angles and carbon fiber reinforced polymer sheet under cyclic loads have been conducted to investigate the seismic behaviors. The research focused on such a few aspects as shown below.Seven reinforced concrete columns strengthened with combination of bonded steel angles (BSA) and carbon fiber reinforced polymer sheet (CFRP) under cyclic loads have been conducted to investigate the seismic behaviors. Manufacture of the specimen, the whole experiment process and especially concerning phenomena are expounded. The difference of strengthening methods in seismicity is decided by their comparison while parameters influence on members hysteresis, curve shape , elastic rigidity and ductility are all analyzed by hysteresis curve and curve shape. The results demonstrate that there is a remarkable improvement in ductility, energy dissipation and the load-carrying capacity of flexural-compressive .concrete columns strengthened with combination of bonded steel angles (BSA) and carbon fiber reinforced polymer sheet (CFRP) compared with un-strengthened columns. Furthermore, seismic behaviors of combined strengthened columns are also improved compared with only strengthened by externally wrapped angle steel.Based on confirmation of stress-strain relationship model of steel and core concrete subjected to cyclic loads, theoretical analysis is made on monotonous curve and P-△ hysteresis curve of steel tube concrete flexural-compressive members with rectangular section. P-△ hysteresis curves obtained from this agree well with computational results. Furthermore, the influences of such parameters as axial load ratio, re-strengthening amount of BSA and CFRP, compression strength of concrete on P-△ hysteresis curves are all analyzed based on load-displacement monotonous curve obtained from numerical computation.更多还原