【摘要】 在利用OpenSees对钢-连续纤维复合筋(SFCB)力学性能进行较好模拟的基础上,研究配筋率、轴压比、SFCB材性二次刚度比等指标对SFCB柱承载力和变形能力的影响;进而研究SFCB柱在三个不同地震波激励下的最大位移和残余位移响应特征,最后对普通RC柱和SFCB柱的滞回性能进行比较研究。结果表明,①基于材料的复合法则,利用OpenSees分别模拟钢筋和FRP部分,可以较好的模拟SFCB在单向拉伸和往复拉伸作用下的力学特性;②同样配筋率下,较高二次刚度比的SFCB增强的混凝土柱具有较高的屈服后二次刚度,且复合筋中FRP含量的增加有利于提高SFCB柱的变形能力;③提高轴压比对SFCB柱二次刚度有所削弱,而较高SFCB材性二次刚度比可延缓SFCB柱中FRP断裂后由P-δ效应引起的倒塌;④和等刚度配筋率的RC柱相比,8度大震作用下,SFCB材性二次刚度比大于0.15可以实现较小震后残余位移;⑤水平往复荷载作用下的混凝土柱理论和试验分析结果均表明,SFCB柱卸载残余位移远小于普通RC柱,即SFCB柱可以实现较高的震后可修复性。更多还原

【Abstract】 Though simulation of the mechanical properties of steel-FRP(fiber reinforced polymer) composite bar(SFCB) with OpenSees,the influences of reinforcement ratio,axial compression ratio,and SFCB post-yield stiffness ratio on the bearing capacity and deformation capacity of SFCB columns,and the maximum and residual deformation responses of SFCB column with different post-yield stiffness ratios under the excitation of three different earthquake waves were studied.The hysterisis behavior of SFCB columns and that of one reference RC(reinforced concrete) column were compared.The results showed:(1) the mechanical properties of SFCB under tensile and cyclic tensile loads could be well simulated by OpenSees based on the mixture rule,during which the steel bar and FRP were modeled separately;(2) with the same reinforcement ratio,the post-yield stiffness and corresponding deformation capacity of SFCB column increased with the increase of FRP content in SFCB;(3) the increase of column axial compression ratio had a negative effect on the post-yield stiffness of SFCB column,and more FRP in SFCB could delay the collapse of SFCB columns caused by the P-δ effect;(4) under the excitation of sever earthquakes of 400 Gal acceleration,SFCB column would exhibit smaller residual displacement than ordinary RC column when the post-yield stiffness ratio of SFCB was larger than 0.15;(5) both the calculation and the experimental results of SFCB columns under horizontal cyclic loading indicated that SFCB column could have smaller residual displacement than RC column,meaning that SFCB column had better post-earthquake reparability.更多还原