摘要
进行了纤维材料环向缠绕加固混凝土偏压柱的静载试验,其中,碳纤维加固试件5个,玻璃纤维加固试件10个。结果表明,与未加固柱相比,由于纤维的约束,达极限承载力时,混凝土的极限应变增加,柱中纵筋的应变都增大。纤维环向缠绕加固,可提高小偏压柱的承载、变形能力和刚度,也可提高大偏压柱的承载力;采用全包法加固比条带法加固效果显著且更经济;还引入含纤特征值λf衡量纤维布的相对用量,提出了偏压柱约束混凝土的应力、应变计算公式,参考规范提出环向缠绕纤维材料加固偏压柱的承载力计算公式,并与试验结果对比,验证了公式的有效性。
Five eccentric column strengthened with circumferential CFRP and ten with circumferential GFRP were tested under static load in this paper. Because of the reinforcement of the fiber polymer, the increment of the concrete and steel ultimate strain could be obtained, and the small eccentricity column＇s strength, ductility and stiffness can be raised, and the big eccentricity column＇s carrying capacity can be enhanced also. The specimens which were fully wrapped with fiber polymer are more efficient and economic than those which were partially wrapped. In this paper characteristic number λf is introduced to describe the relative quantity of the fiber. The strain and stress formula for restrained concrete of eccentric column are deduced. Refer to the standard, the practical formula to calculate the carrying capacity of eccentric column winded with FRP is put forward and proved to be efficient by experiment.
出处
《四川建筑科学研究》
北大核心
2009年第6期76-79,共4页
Sichuan Building Science
关键词
碳纤维
玻璃纤维
全包加固
条带加固
含纤特征值λf
Carbon Fiber Reinforce Plastics （CFRP）
Glass Fiber Reinforce Plastics （GFRP）
fully wrapped
partially wrapped
characteristic number λf describing the relative quantity of the fiber
