ABSTRACT

Based on the proposed material model, through the finite element method, the influences of the strain rate and the recycled coarse aggregate (RCA) replacement ratio on the structural behaviors and the damage evolution of the recycled aggregate concrete (RAC) structure are thoroughly investigated. The corresponding empirical formulas of the influence factors are proposed. It is revealed that the suffered damage in the structure increases with the increasing RCA replacement ratio. Based on the experimental results and the numerical simulation, the rate-dependent damage model of the RAC structure is proposed. The effects of the replacement ratio and the strain rate are taken into account in the suggested structural damage model. The damage evolution based on the proposed damage function model in this study is significantly important to improve the seismic performance and guide the seismic design of recycled aggregate concrete structures in the popularization and application of RAC.

摘要

基于所提出的材料模型，通过有限元方法，深入研究了应变率和再生粗骨料（RCA）替代率对再生骨料混凝土（RAC）结构的结构行为和损伤演化的影响。提出了相应的影响因素经验公式。结果表明，结构中遭受的损坏随着RCA更换率的增加而增加。基于实验结果和数值模拟，提出了RAC结构的速率相关损伤模型。在建议的结构损伤模型中考虑了替换率和应变率的影响。