| 摘要： | Strain hardening cementitious composite (SHCC) is an attractive construction material used for reinforced concrete (RC) strengthening, and a simplified method has been previ- ously proposed for evaluating the behavior of SHCC flexural strengthening RC member (Zhang, Engineering Fracture Mechanics 2014; 121?122: 11?27), whereas the load carry- ing capacity of strengthened RC member is over-estimated using the simplified method. In this study, a numerical approach improved from the aforementioned method is pre- sented for accurately evaluating the behavior of SHCC flexural strengthening RC member, considering the influence of the tensile strain capacity of SHCC, presence of localized con- crete cracks and varying SHCC layer thickness, in which a zero-span tensile model with fic- titious material is adopted to obtain the average tensile behavior of SHCC layer for strengthening RC member with crack. The effectiveness of the improved numerical approach is confirmed thorough the comparison between experimental and numerical investigations. |
