碳纤维布加固钢筋混凝土柱的破坏曲率增大系数分析

编制了碳纤维布加固钢筋混凝土柱的截面弯矩-曲率关系全过程分析程序,通过对多种工况下碳纤维布加固钢筋混凝土柱的破坏曲率进行大量计算分析,较全面地探讨了截面尺寸、轴压比、碳纤维布配箍特征值、箍筋配箍特征值、纵筋配筋率、混凝土强度等参数对碳纤维布加固钢筋混凝土柱破坏曲率增大系数的影响,在此基础上给出了该增大系数的回归计算公式。研究结果表明,该增大系数随着碳纤维布配箍特征值的增大而增大,且变化最为显著;此外,大多数情况下该增大系数还随构件截面尺寸或箍筋配箍特征值的增大而减小。给出的增大系数回归计算公式较好地反映了该系数随各主要参数的变化趋势。

ANALYSIS OF DAMAGE-CURVATURE-ENHANCEMENT-COEFFICIENT OF R.C. COLUMNS STRENGTHENED WITH CARBON FIBER SHEETS

A computer program is developed for analyzing the moment-curvature relationship of R.C.columns strengthened with carbon fiber sheets(CFSs).Using the computer program,a parametric study is conducted to examine the effect of various parameters on the damage-curvature-enhancement-coefficient(DCEC) of reinforced concrete columns strengthened with CFSs.The parameters include cross-sectional dimension,axial load ratio,characteristic value corresponding to carbon fiber sheets,characteristic value corresponding to transverse reinforcement,longitudinal reinforcement ratio,and compressive strength of concrete.A regression formula is put forward for the DCEC.Results indicate that:(1) With an increase in the characteristic value corresponding to carbon fiber sheets,the DCEC increases;(2) In majority cases,the DCEC decreases by enhancing the cross-sectional dimension or the characteristic value corresponding to transverse reinforcement;(3) The proposed regression formula agrees well with the numerical results.