摘要
以CFRP加固方式和轴压比为主要参数,进行了9个CFRP-方钢管混凝土压弯构件的滞回试验,建议了适合有限元软件ABAQUS中使用的CFRP材料模型及CFRP断裂的模拟方法,并建立了双向CFRP-方钢管混凝土压弯构件的有限元模型。研究结果表明:该类构件的滞回曲线饱满;轴压比越大,构件的延性越差,抗剪承载力越低;纵向布可有效提高构件的抗剪承载力,但随着轴压比的增大,纵向CFRP的加固效果下降;环向布可显著提高构件的耗能能力,同时环向布还可保证纵向布与钢管之间良好的粘接性能。为该类新型组合构件的工程应用建议了简化的横向荷载-位移滞回模型。
The dynamic tests of nine CFRP-reinforced square concrete-filled steel tubular （CFST） beam-columns with Carbon fibre reinforced polymer （CFRP） were carried out. The main parame- ters include the CFRP-reinforced method and the axial load level. The material model of CFRP and the modelling method of CFRP rupture used in ABAQUS were then proposed. The finite ele- ment model （FEM） for bidirectional CFRP-reinforced square CFST beam-columns was devel- oped. Test results indicate that hysteretic curves of beam-columns are good. With the increasing of the axial load level, the ductility and the shear capacity decrease. The longitudinal CFRP can effectively improve the shear capacity, the reinforced effect however decreases with the increasing of axial load level. The lateral CFRP can significantly enhance energy dissipation capacity. Mean- while, the lateral CFRP can be used to ensure the good adhesive performance between the steel tube and the longitudinal CFRP. Finally, for the utilization of this new composite specimen, the simplified hysteretic model of lateral force versus displacement was provided. The predicted re- sults agree well with tested ones. 2 tabs, 12 figs, 26 refs.
出处
《长安大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2014年第6期91-99,共9页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(51308124)
福建省自然科学基金项目(2013J05073)
关键词
土木工程
CFRP-方钢管混凝土压弯构件
滞回性能
有限元模型
简化滞回模型
civil engineering
CFRP-reinforced square CFST beam-columns
dynamic behaviorfinite element model （FEM）
simplified hysteretic model
