通过15根碳纤维预应力棱柱体复合筋(Carbon Fiber Reinforced Plastics Prestressed Concrete Prisms,简称“CFRPPCPs复合筋”)混凝土柱进行偏心受压试验,考虑相对偏心距、复合筋配筋率、CFRP筋张拉控制应力和普通钢筋配筋率4个变化参数对复合筋混凝土柱受力性能的影响.观察了试件的受力过程及破坏形态,获取了试件开裂荷载、极限承载力、荷载-侧向变形曲线等重要数据,分析了4个变化参数对CFRP-PCPs复合筋混凝土柱偏心受压作用下的开裂荷载和极限承载力的影响规律.研究结果表明:CFRP-PCPs复合筋混凝土偏压柱与普通钢筋混凝土偏压柱的受力过程及破坏形态相似,试件的开裂荷载和极限承载力均随相对偏心距的增大而降低;提高CFRP筋张拉控制应力、增大复合筋配筋率和普通钢筋配筋率均能有效提高CFRP-PCPs复合筋混凝土柱的开裂荷载和极限承载力.
In order to study the mechanical performance of CFRP-PCPs composite reinforced concrete eccentric compression columns,fifteen specimens are designed for eccentric loading tests.Four variable factors such as eccentricity,ratio of composite reinforcement,tension control stress of CFRP bars and general reinforcement ratio are taken into consideration.According to the test,the stress distribution,cracking load,ultimate bearing capacity,load-strain curve and other important data are obtained,and the influence of four variable factors on cracking load and the ultimate capacity of CFRP-PCPs composite reinforced concrete eccentric compression columns is analyzed.The results show that the damage process and failure mode of a CFRP-PCPs composite reinforced concrete eccentric compression column are similar to those occurred in an ordinary reinforced concrete eccentric compression column,where the cracking load and the limited supporting capacity decreased gradually with the increase of eccentricity.The cracking load and the limited supporting capacity of CFRP-PCPs composite reinforced concrete columns can be improved effectively by increasing the stress of tension control,increasing the ratio of CFRP-PCPs composite reinforcement and ordinary steel bars.
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