单调荷载作用下CFRP加固混凝土复合受扭柱的有限元分析

Finite element analysis of CFRP strengthened concrete composite torsional columns under monotonic loading

为了研究CFRP(碳纤维增强复合材料)加固混凝土复合受扭柱在单调荷载作用下的受力性能,以轴压比、扭弯比、配筋率、配箍率、混凝土强度和CFRP加固方式为设计参数,设计了13根CFRP加固混凝土柱(简称CCZ柱)和1根钢筋混凝土柱(简称RCZ柱),并利用ABAQUS软件进行了数值模拟分析。结果表明:轴压比提高,峰值扭矩提高但延性降低;扭弯比提高,前期刚度、开裂扭矩和峰值扭矩均提高,且延性得到改善;配筋率提高,对前期刚度、开裂扭矩、峰值扭矩和延性的影响都不大;配箍率和混凝土强度提高,峰值扭矩提高,但对前期刚度、开裂扭矩和延性的影响不大;CFRP环贴加纵贴起到的加固效果最好。

In order to study the mechanical performance of CFRP reinforced concrete composite torsional columns under the monotone load,13 CFRP reinforced concrete columns(CCZ column)and 1 reinforced concrete column(RCZ column)were designed with axial compression ratio,torsional bending ratio,reinforcement ratio,hoop ratio,concrete strength and CFRP reinforcement as design parameters,and ABAQUS software is used for numerical simulation analysis.The results show that the peak torque increases but ductility decreases with the increase of axial compression ratio;with the increase of torsional bending ratio,the stiffness,cracking torque and peak torque are all increased,and the ductility is improved;the increase of reinforcement ratio has little effect on stiffness,cracking torque,peak torque and ductility;with the increase of stirrup ratio and concrete strength,the peak torque increases,but it has little effect on stiffness,cracking torque and ductility;and CFRP ring paste plus vertical paste presents the best effect in strengthening.