混凝土动态力学行为数值模拟研究  

NUMERICAL ANALYSIS ON DYNAMIC MECHANICAL BEHAVIOR OF CONCRETE

作　　者：李晓琴[1] 廖俊智 陈建飞 陆勇[3] 陈前均 LI Xiao-qin;LIAO Jun-zhi;CHEN Jian-fei;LU Yong;CHEN Qian-jun(Faculty of Civil Engineering,Kunming University of Science and Technology,Kunming,Yunnan 650500,China;Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,Guangdong 518055,China;Institute for Infrastructure and Environment,School of Engineering,University of Edinburgh,Edinburgh EH93JL,UK;Institute of Subsurface Energy System,TU Clausthal,Clausthal-Zellerfeld 38678,Germany)

机构地区：[1]昆明理工大学建筑工程学院,云南昆明650500 [2]南方科技大学海洋科学与工程系,广东深圳518055 [3]爱丁堡大学工程学院基础设施与环境研究所,英国EH93JL [4]克劳斯塔尔工业大学地下能源系统研究所,德国38678

出　　处：《工程力学》2024年第12期42-51,共10页Engineering Mechanics

基　　金：国家自然科学基金项目(52168029,51968035);云南省万人计划青年拔尖人才项目(云人社通[2020]150号YNWR-QNBJ-2020-049)。

摘　　要：混凝土动态强度的增强效应DIF(dynamic increase factor)一般由混凝土霍普金森杆SHPB(split Hopkinson pressure bar)试验进行测量,而基于不同应变率ε条件下的试块尺度的SHPB试验结果得到的宏观DIF-ε关系不能直接应用于数值模型定义。运用ANSYS/LS-DYNA有限元软件和K&C混凝土模型,对混凝土SHPB直接拉伸、劈裂和层裂试验进行了模拟研究。提出了局部和非局部损伤模型中引入网格和应变率ε双修正的DIF-ε模拟方案,并对混凝土非局部损伤模型中非局部特征长度L在数值模拟中的应用方案进行了讨论。SHPB和混凝土梁冲击试验模拟研究和试验数据的比较结果均表明,提出的分别基于局部和非局部损伤混凝土模型的双修正DIF-ε模拟方案能够较为准确描述混凝土动态力学行为。The dynamic increasing factor(DIF)of concrete is normally measured via split Hopkinson pressure bar(SHPB)tests.However,the tested macro-scale DIF-ε relationship from the specific SHPB test specimens under different strain rates εcannot be directly introduced to finite element(FE)modelling.Based on the ANSYS/LS-DYNA and K&C concrete damage model,the SHPB direct tension,split and spalling tests were modelled,and a modified DIF-εrelationship with both mesh and ε corrections for dynamic mechanic behaviour of concrete material was proposed for local and non-local damage modelling of concrete respectively,also the numerical application of the nonlocal characteristic length L was detailed discussed.The comparison between the SHPB/impact test modelling and the relevant test results indicated that the proposed doubly corrected DIF-ε numerical application schemes could properly capture the concrete dynamic mechanical property.

关 键 词：混凝土 DIF 应变率 SHPB 有限元分析 局部损伤模型 非局部损伤模型 

分 类 号：TU528.1[建筑科学—建筑技术科学]