高应变率下再生橡胶颗粒改性混凝土受压破坏细观数值模拟  

Numerical modeling of compressive behavior of recycled rubber-filled concrete at high strain rates

作　　者：师燕超[1,2] 李忠献[1,2] 

机构地区：[1]天津大学建筑工程学院,天津300072 [2]滨海土木工程结构与安全教育部重点实验室(天津大学),天津300072

出　　处：《地震工程与工程振动》2010年第6期98-105,共8页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(50638030);国家科技支撑计划重点项目(2006BAJI3B02);天津市应用基础和前沿技术研究计划重点项目(08JCZDJC19500);科技计划项目(06QTPTSF05600)

摘　　要：再生橡胶颗粒改性混凝土作为一种绿色的新型混凝土材料,具有低弹性模量、大变形、高阻尼、能量耗散多及抗裂性能好等特点,引起了国内外土木工程界特别是混凝土界的广泛关注和研究。然而,目前该领域所进行的研究多为再生橡胶颗粒改性混凝土的动力特性及其在静载作用下破坏规律;而对动力荷载作用下再生橡胶颗粒改性混凝土动态响应及破坏的相关研究则很少涉及。在高应变率下,再生橡胶颗粒改性混凝土是否仍然保有其大变形、高能量耗散和良好的抗裂性能的优点,是否具有卓越的抗爆炸抗冲击性能,成为该领域一个很有意义的科学问题。本文利用有限元显式动力分析软件建立了包含水泥砂浆、粗骨料两相的普通混凝土随机细观模型,以及包含水泥砂浆、粗骨料、橡胶颗粒三相的再生橡胶颗粒改性混凝土随机细观模型,通过在静力荷载作用下普通混凝土和再生橡胶颗粒改性混凝土的破坏分析和比较,验证了建立的混凝土随机细观模型的合理性。在此基础上,研究了再生橡胶颗粒改性混凝土在冲击荷载作用下受压破坏的破坏规律,通过与普通混凝土的比较,揭示了再生橡胶颗粒改性混凝土在高应变率下的受压破坏的特点,为其进一步应用于建筑结构的抗爆抗冲击提供理论基础和技术支持。As a new green concrete material, recycled rubber-filled concrete is of low Young’s modulus, remarkable deformation capacity, high energy dissipation and great crack resistance. Thus, it is becoming a hot research topic in the field of concrete research at home and aboard. However, current researches in this field are mainly focused on the dynamic characteristics and damage law under static load of the recycled rubber-filled concrete. On the other hand, little information could be found about the dynamic responses and damage to the recycled rubber-filled concrete at high strain rates in the current literatures. Therefore,it is of great significance to investigate whether the recycled rubber-filled concrete still have the advantages of large deformation capacity, high energy dissipation and extremely good crack resistance at high stain rates. In this paper, both the mesoscale model, including two phases with coarse aggregate and mortar, for plain concrete and the mesosclae model for recycled rubber-filled concrete with coarse aggregate, mortar and recycled rubber particles are established using the explicit dynamic finite element software LS-DYNA. Based on the numerical models, the static compressive behavior of both the plain concrete and the recycled rubber-filled concrete are simulated. The results are compared with those from other researches to verify the accuracy and reliability of the established mesoscale models. On this basis, the compressive behavior of recycled rubber-filled concrete at high strain rates is investigated and compared with the plain concrete. The results could be used as a technical support for applying the recycled rubber-filled concrete in the blast resistant engineering.

关 键 词：再生橡胶颗粒改性混凝土 高应变率 受压破坏 随机细观模型 数值模拟 

分 类 号：TU375[建筑科学—结构工程]