Dynamic Elastic-Plastic Analysis on High-rise Recycled Aggregate Concrete Frame-Shear Wall Structures

Abstract:

Based on detailed analysis of material properties of recycled aggregate concrete (RAC) and the differences between the nonlinear behavior of RAC and those of normal concrete, key points about elastic-plastic analysis on RAC structures, including selecting the proper analysis software, constitutive relation model and structure modeling were discussed. Then the elastic-plastic analysis on one RAC frame-shear wall high-rise demonstration project was undertaken, while the analysis result were compared with that of normal concrete structures. The analysis result demonstrates that when the recycled coarse aggregate (RCA) replacement ratio is lower than 30%, although the relative elastic-plastic drift angle of RAC structures is larger than that of normal concrete structures, it can still meet the requirements of “no-collapsing with rarely-met intensity earthquake”. The energy dissipation due to structural elastic-plastic deformation and hysteretic stiffness degradation of RAC structure accounts for 32.8% of the total energy, which decreases by 9.6% from the corresponding normal concrete structure. According to the performance of the components, it can be concluded that the high-rise RAC frame-shear wall structure conforms the concepts for the seismic design such as “strong column-weak beam” and “strong wall-weak coupling beam”.