东南大学学报（自然科学版）2017，Vol.47Issue(4)：776-784,9.DOI:10.3969/j.issn.1001-0505.2017.04.023
再生混凝土力学性能的应变率敏感性数值模拟
Numerical simulation on strain-rate sensitivity of mechanical properties of recycled aggregate concrete
摘要
Abstract
A finite element model based on the modeled recycled aggregate concrete with nine aggregates is established.The strain-rate sensitivity of mechanical properties of recycled aggregate concrete (RAC) and the influence of the strain-rate sensitivity of each meso-phase material on it are studied.The effects of the recycled coarse aggregate (RCA) replacement ratio and the strength of new mortar or old mortar on the overall strain-rate sensitivity of RAC are discussed.The simulation results show that the finite element model can simulate the strain-rate sensitivity of RAC well.The peak stress and elastic modulus of RAC increase almost linearly with the increase of strain-rate, and the increasing rate of elastic modulus is more uniform.Compared with aggregate and interfacial transition zone, the strain-rate sensitivity of RAC is mainly influenced by the strain-rate sensitivity of mortar in RAC.When the RCA replacement ratio increases or the strength of new mortar or old mortar decreases, the strain-rate sensitivity of elastic modulus of RAC increases, but the influences of these factors on the strain-rate sensitivity of peak stress of RAC are different.关键词
再生混凝土/力学性能/应变率敏感性/数值模拟/再生粗骨料取代率Key words
recycled aggregate concrete (RAC)/mechanical property/strain-rate sensitivity/numerical simulation/recycled coarse aggregate (RCA) replacement ratio分类
建筑与水利引用本文复制引用
李龙,肖建庄,黄凯文..再生混凝土力学性能的应变率敏感性数值模拟[J].东南大学学报（自然科学版）,2017,47(4):776-784,9.基金项目
国家杰出青年科学基金资助项目(51325802). （51325802）
