【摘要】 为研究钢-FRP复合筋(Steel-FRP Composite Bar,SFCB)超高性能混凝土(Ultra-High Performance Concrete,UHPC)梁受弯性能,采用有限元软件ABAQUS对2根SFCB-UHPC梁和1根普通钢筋-UHPC梁受弯性能试验进行数值模拟,验证了模拟的可行性。分析了SFCB外包FRP弹性模量、截面含钢率和内芯钢筋强度对SFCB-UHPC受弯梁承载力、变形、延性和耗能的影响。研究表明,随着SFCB外包FRP弹性模量的提高,试件屈服和极限荷载提高,而耗能和延性降低;随着SFCB截面含钢率增大,试件屈服荷载增大而极限荷载下降,耗能和延性也降低;随SFCB内芯钢筋强度的提高,试件屈服和极限荷载增加,耗能增加而延性降低。研究可为钢-FRP复合筋UHPC梁的分析设计提供参考。更多还原

【Abstract】 To investigate the bending performance of Steel-FRP Composite Bar(SFCB) reinforced Ultra-High Performance Concrete(UHPC) beams,numerical simulations were conducted on two SFCB-UHPC beams and one ordinary steel bar-UHPC beam using the finite element software ABAQUS to verify the validity of the simulation.The effects of elastic modulus of SFCB outer-wrapped FRP,steel ratio of SFCB and strength of inner steel on bending capacity,deformation,ductility,and energy dissipation of SFCB-UHPC beams were analyzed.Research has shown that as the elastic modulus of SFCB out-wrapped FRP increases,the yield and ultimate load increase,while energy dissipation and ductility decrease.As the steel ratio of SFCB increases,the yield load increases while the ultimate load decreases,and the energy dissipation and ductility decrease.As the strength of SFCB inner steel increases,the yield and ultimate load increase,energy dissipation increases,but ductility decreases.The research can provide reference for the analysis and design of SFCBs reinforced UHPC beams.更多还原