[1]李龙,等.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.[doi:10.3969/j.issn.1001-0505.2017.04.023]
 Li Long,Xiao Jianzhuang,Huang Kaiwen.Numerical simulation on strain-rate sensitivity of mechanical properties of recycled aggregate concrete[J].Journal of Southeast University (Natural Science Edition),2017,47(4):776-784.[doi:10.3969/j.issn.1001-0505.2017.04.023]
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再生混凝土力学性能的应变率敏感性数值模拟()
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《东南大学学报(自然科学版)》[ISSN:1001-0505/CN:32-1178/N]

卷:
47
期数:
2017年第4期
页码:
776-784
栏目:
材料科学与工程
出版日期:
2017-07-20

文章信息/Info

Title:
Numerical simulation on strain-rate sensitivity of mechanical properties of recycled aggregate concrete
作者:
李龙1 2肖建庄1黄凯文1
1同济大学土木工程学院, 上海 200092; 2香港理工大学建设与环境学院, 香港999000
Author(s):
Li Long12 Xiao Jianzhuang1 Huang Kaiwen1
1College of Civil Engineering, Tongji University, Shanghai 200092, China
2Faculty of Construction and Environment, The Hong Kong Polytechnic University, Hong Kong 999000, China
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
Keywords:
recycled aggregate concrete(RAC) mechanical property strain-rate sensitivity numerical simulation recycled coarse aggregate(RCA)replacement ratio
分类号:
TU528.59
DOI:
10.3969/j.issn.1001-0505.2017.04.023
摘要:
基于九骨料模型再生混凝土建立了有限元模型,研究了再生混凝土力学性能的应变率敏感性以及细观相材料应变率敏感性对其的影响,并讨论了再生粗骨料取代率和新、老砂浆强度对再生混凝土应变率敏感性的影响.结果表明,该有限元模型能较好地模拟再生混凝土力学性能的应变率敏感性;再生混凝土峰值应力和弹性模量随着应变率的增大近乎线性增大,且弹性模量呈现更加均匀的增长趋势;相比骨料和界面过渡区,砂浆的应变率敏感性对再生混凝土整体应变率敏感性起主导作用;再生粗骨料取代率增大或新、老砂浆强度降低时,再生混凝土的弹性模量应变率敏感性增大,但它们对再生混凝土峰值应力应变率敏感性的影响有所不同.
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.

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备注/Memo

备注/Memo:
收稿日期: 2016-12-20.
作者简介: 李龙(1988—),男,博士;肖建庄(联系人),男,博士,教授,博士生导师,jzx@tongji.edu.cn.
基金项目: 国家杰出青年科学基金资助项目(51325802).
引用本文: 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. DOI:10.3969/j.issn.1001-0505.2017.04.023.
更新日期/Last Update: 2017-07-20