FRP网格约束混凝土圆柱的抗震性能

对纤维增强聚合物(FRP)网格约束混凝土圆柱进行了轴压荷载试验;给出了FRP网格侧向约束强度和侧向约束刚度计算公式及FRP网格约束混凝土圆柱的应力-应变关系模型确定方法.在此基础上,进一步完成了FRP网格加固钢筋混凝土圆柱在低周反复荷载作用下的试验,重点探讨了FRP网格加固用量及FRP网格中纵筋是否锚入柱底座对试件承载力和变形能力的影响.结果表明,FRP网格约束后混凝土圆柱的强度和延性有明显提高,约束后的应力-应变关系曲线有无软化段主要与FRP约束量有关,FRP网格加固能明显提高钢筋混凝土结构的承载力和延性等抗震性能.

Aseismic Performance of Circular Concrete Columns Confined with FRP Grids

A series of axial compression load tests of circular concrete columns confined with FRP grids were carried out.The equations for calculating the lateral confinement strength,lateral confinement modulus, as well as the stress and strain relation models of circular concrete columns confined with FRP grids were suggested.Based on this,the circular RC columns strengthened with FRP grids were tested under constant axial load and reversed cyclic lateral load.The parameters including the confinement strength and modulus of FRP which the bearing capacity and deformability of specimens for the anchorage types of FRP grids at the bottom were mainly discussed.The results show that FRP grids can significantly improve the strength and ductility of circular concrete columns.The stress and strain relation curves of circular concrete columns confined with FRP grids may be with strain-softening response or not,which is strongly related to the confinement strength and modulus of FRP.The strengthening of FRP grids can obviously improve the aseismic performance including the capacity and ductility of RC structures.