基于ABAQUS的混凝土单轴冻融损伤本构模型研究  

Development and application of uniaxial constitutive model of freeze-thaw concrete based on ABAQUS

作　　者：王建伟 逯静洲[1] 朱朝磊 王维良 孔政宇 Wang Jianwei;Lu Jingzhou;Zhu Chaolei;Wang Weiliang;Kong Zhengyu(School of Civil Engineering,Yantai University,Yantai 264005,China)

机构地区：[1]烟台大学土木工程学院,山东烟台264005

出　　处：《建筑科学》2022年第7期34-39,共6页Building Science

基　　金：国家自然科学基金资助项目(51978596);山东省自然科学基金博士基金项目(ZR2017BEE046)。

摘　　要：为进行受冻融混凝土动态加载特性的研究,利用通用有限元软件ABAQUS的用户材料子程序UMAT接口,采用Fortran语言编制了受冻融混凝土单轴受压本构模型。通过数值模拟的方式研究混凝土经冻融循环后动态加载特性,将其结果与试验结果进行对比。研究发现,使用本文编制的混凝土受冻融本构模型模拟所得的结果与试验结果基本吻合。此外,进一步分析了冻融次数和应变率对混凝土力学性能的影响,结果显示:在相同应变率作用下,随着冻融次数的增加混凝土的抗压强度均有所降低,而峰值应变逐渐增大;在相同冻融次数作用下,随着应变率的增大混凝土的抗压强度均有所增加,而峰值应变逐渐减小,表现出明显的脆性。In order to study the dynamic loading characteristics of freeze-thawed concrete, the uniaxial compression constitutive model of freeze-thawed concrete is developed by Fortran language using the user material subroutine UMAT interface of ABAQUS. The dynamic loading characteristics of concrete after freeze-thaw cycles are studied by numerical simulation, and the simulation results are compared with the experimental results. It is found that the results obtained by the freeze-thaw constitutive model of concrete prepared in this paper are basically consistent with the experimental results. In addition, the effects of freeze-thaw cycles and strain rates on the mechanical properties of concrete are further analyzed. The results show that under the same strain rate, the compressive strength of concrete decreases with the increase of freeze-thaw cycles, while the peak strain increases gradually. Under the same freeze-thaw cycles, the compressive strength of concrete increases with the increase of strain rate, while the peak strain decreases gradually, showing obvious brittleness.

关 键 词：混凝土 冻融循环 加载速率 数值模拟 UMAT 

分 类 号：TU528[建筑科学—建筑技术科学]