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|本期目录/Table of Contents|

考虑温度影响的混凝土弹塑性本构模型及其应用

《应用力学学报》[ISSN:1000-4939/CN:61-1112/O3]

期数:
2019年02期
页码:
280-288
栏目:
出版日期:
2018-12-18

文章信息/Info

Title:
The elasto-plastic constitutive model of concrete including effects of temperature and its application
作者:
李亮1姜文华1吴俊12杜修力1
1 北京工业大学 城市与工程安全减灾教育部重点实验室 100124 北京;2 上海工程技术大学 城市轨道交通学院 201620 上海
Author(s):
Li Liang1 Jiang Wenhua1 Wu Jun12 Du Xiuli1
1 The Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education, Beijing University of Technology, 100124, Beijing, China; 2 School of Urban Railway Transportation, Shanghai University of Engineering Science, 201620, Shanghai, China
关键词:
混凝土弹塑性本构模型温度半隐式回映算法
分类号:
TU528.0
DOI:
10.11776/cjam.36.02.B008
文献标识码:
A
摘要:
基于弹塑性理论的框架,引入热力学中的自由能概念,建立了考虑温度影响的混凝土弹塑性本构模型。假设混凝土为弹塑性解耦材料,通过采用包含温度的自由能函数建立了弹性应力-应变关系的表达式;基于Drucker-Prager强度准则构造屈服函数,以塑性剪应变作为硬化参量,通过在硬化规律中引入温度变量来反映温度对混凝土塑性性质的影响,得到了塑性应力-应变关系的表达式。基于ABAQUS有限元软件平台,应用半隐式回映算法编制了上述弹塑性本构模型的UMAT子程序,完成了该模型的程序实现。通过对C20及C40混凝土单元在不同温度条件下单轴压缩与双轴压缩的数值模拟,并将模拟结果与已有文献试验结果进行了对比,二者符合较好,验证了该模型的正确性。应用该模型模拟混凝土材料的力学特性,开展了不同温度下集中荷载作用的混凝土简支梁及混凝土轴心受压柱力学响应的数值模拟。计算结果表明,随着温度的升高,相同荷载作用下混凝土构件的力学响应逐渐增大,反映了混凝土材料的力学性能随着温度的升高逐渐退化,这符合不同温度条件下混凝土构件力学响应的基本规律。

参考文献/References

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