中文摘要：

在6根自密实混凝土增大截面加固柱的拟静力试验基础上,采用ABAQUS建立了自密实混凝土加固钢筋混凝土柱的非线性有限元模型,并将抗剪承载力计算结果与试验结果进行对比,验证有限元模型的可行性.对二次受力下自密实混凝土加固柱的抗剪承载力进行参数扩展分析,探讨初始应力水平对加固柱抗剪承载力的影响规律.结果表明,不同初始应力对加固柱的抗剪承载力影响较大,当初始轴向应力水平低于0.75时,加固柱的抗剪承载力随初始轴向应力的增大而增大,当初始轴压比达到0.75时,加固柱的抗剪承载力达到最大.初始轴向应力水平大于0.75后,抗剪承载力不再随初始轴向力的增大而增大.因此在加固工程中应根据不同初始受力来考察柱的抗剪承载力.

英文摘要：

Based on the shear behavior tests of six columns strengthened by self-compacting concrete （SCC）,the finite element analytical model of the RC columns strengthened by SCC was developed using ABAQUS.The simulation results were compared with experimental results to verify the feasibility of the finite element analytical model.And then a further study of was carried out to investigate the effect of the initial loading on the shear capacity of RC columns strengthened by SCC.The results show that the shear capacity increases with the initial loading when the axial compression ratio level is lower than 0.75,and reaches the maximum when the ratio equals to 0.75,however,the shear capacity stopped increasing with the axial compression ratio when it is higher than 0.75.Therefore,the shear capacity of such SCC strengthened columns needs to be evaluated considering the different initial loading level in engineering practices.