CFRP加固锈蚀RC柱抗震性能研究

Research on seismic performance of corroded RC columns strengthened with CFRP

钢筋混凝土结构在外界环境侵蚀作用下,抗震性能逐渐退化,利用碳纤维增强基复合材料(CFRP)对锈蚀钢筋混凝土结构进行加固,可有效提高结构的抗震性能。基于ABAQUS软件,选取合理的本构模型及建模方式,建立精细化有限元模型,研究不同CFRP加固方式对锈蚀RC柱抗震性能提升情况。研究结果表明:随着轴压比的增大,CFRP加固锈蚀RC柱承载能力小幅提升,但延性和耗能能力有所降低;随着CFRP加固高度的增大,锈蚀RC柱抗震性能大幅提高,从经济性、施工便利性等角度考虑,对1.5倍塑性铰高度进行加固,即可显著提升锈蚀RC柱的抗震性能。

Under the Erosion of the external environment,the seismic performance of reinforced concrete structures gradually degrades.The use of carbon fiber reinforced polymer(CFRP)to strengthen corroded reinforced concrete structures can effectively improve the seismic performance of structures.Based on ABAQUS software,a reasonable constitutive model and modeling method was selected,a refined finite element model was established,and the improvement of seismic performance of corroded RC columns by different CFRP reinforcement methods was studied.The research results indicate that as the axial compression ratio increases,the bearing capacity of corroded RC columns strengthened with CFRP slightly increases,but the ductility and energy dissipation capacity decrease.With the increase of CFRP reinforcement height,the seismic performance of corroded RC columns has significantly improved.From the perspectives of economy and construction convenience,strengthening 1.5 times the plastic hinge height can significantly improve the seismic performance of corroded RC columns.