周期荷载作用下碳纤维布对钢筋混凝土悬臂梁的加固效果研究

The Reinforced Effect of Carbon Fiber on the Concrete Cantilever Beams Under Cyclic Loading

通过ANSYS数值模拟平台,建立了碳纤维布加固钢筋混凝土悬臂梁的有限元模型,在考虑材料的非线性下,利用瞬态分析方法考察周期荷载作用下碳纤维布对钢筋混凝土悬臂梁加固效果的影响.结果表明:当周期荷载一定时,采用碳纤维布加固后悬臂梁的动力响应降低,梁自由端最大位移减小,固定端混凝土拉应力峰值降低,但固有频率基本不变;随着粘贴层数增加,加固梁的最大位移逐渐减小;对比动、静态分析结果,提出采用静力非线性分析法作为碳纤维布对悬臂梁动、静态加固效果的统一评估方法.

Through the ANSYS simulation platform, this paper established a finite element model of concrete cantilever beams strengthened with CFRP. Considering the nonlinearity of material, the authors used a transient method to investigate the influence of strengthening layer on the effect of reinforced concrete cantilever beams strengthend with CFRP under cyclic load. Research showed that the dynamic response of cantilever beam was decreased when the load was certain. The maximal displacement of the free end of the cantilever beams is reduced after reinforced, meanwhile, the stress peak value of the concrete is decreased after reinforced, but the natural frequency is basically unchanged ; With the increase of crabon fiber layers, the reinforced beam＇s maximum diaplacement is increase; Comparing the maximum diaplacement reducing rate of different layers reinforced beams, it found that 4 layers of CFRP situation have the best reinforcement effect; Comparing the dynamic with static results, it suggested to use the static nonlinear analysis method as a unified evaluation method for the reinforcement dynamic and static reinforcement effect of the cantilever beam.