柱下端局部采用FRC材料钢筋混凝土柱的承载力分析

Bearing Capacity Analysis of the Column with Fiber Reinforced Concrete in Bottom Region

为了改善钢筋混凝土柱的变形能力和损伤容限,在其下端局部采用纤维增强混凝土(FRC)代替普通混凝土,设计了6根剪跨比为3、柱内配置较少箍筋的钢筋混凝土柱试件,进行了拟静力试验。试验结果表明,这种柱为弯曲屈服后的剪切破坏,具有较好的变形能力和损伤容限;局部使用FRC材料可以减少约束箍筋和抗剪箍筋用量。根据试验结果,建立了考虑截面受拉区FRC受拉作用的压弯承载力计算方法以及斜截面受剪承载力计算公式,其中斜截面受剪承载力计算公式的计算值与试验值比较吻合。

In order to improve the deformation capacity and damage tolerance of the reinforced concrete columns ,six reinforced concrete column specimens with fiber reinforced concrete （FRC ） in the bottom region instead of ordinary concrete were tested under reversed cyclic lateral loading .The specimens’ shear span ratio is three and its configuration of stirrups are relatively few . T he test results show that these columns exhibit shear failures after the longitudinal reinforcement yielding , and they have better deformation capacity and damage tolerance .The column with FRC in the bottom region can reduce the amount of constraint stirrup and shear stirrup . According to the test results , bending bearing capacity calculation method considering FRC tension action and shear capacity formula were established .The shear capacity calculated by the adopted formula are in good agreement with the test results .