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混凝土的单轴率型本构模型
引用本文:王哲,林皋,逯静洲.混凝土的单轴率型本构模型[J].大连理工大学学报,2000,40(5):597-601.
作者姓名:王哲  林皋  逯静洲
作者单位:1. 北方交通大学,土木建筑学院,北京,100044
2. 大连理工大学,土木工程系,辽宁,大连,116024
基金项目:国家自然科学基金!资助项目 (重点项目 5 973 9180 ),大连理工大学海岸与近海工程国家重点实验室基金
摘    要:以不同可逆热力学为基础,构造了混凝土的单轴率型本构模型,该模型可描述混凝土的以下特性;初始屈服强度为零;峰值强度随应变速率的增大而增加,在上升段和下降段都是光滑的;当应变趋于无穷大量,应力是收敛的;峰值点处应变不随加载就变速率的增大而变化。另外,根据前人的实验结果,明确提出了在率型本构关系中一致性条件的适用范围是加载应变速率低于应变速率的临界值,这一速率范围也是单轴率型本构模型的适用范围。

关 键 词:本构关系  混凝土  率相关  荷载

A uniaxial rate-dependent constitutive model for concrete materials
WANG Zhe,LIN Gao,LU Jing-zhou.A uniaxial rate-dependent constitutive model for concrete materials[J].Journal of Dalian University of Technology,2000,40(5):597-601.
Authors:WANG Zhe  LIN Gao  LU Jing-zhou
Institution:WANG Zhe 1,LIN Gao 2,LU Jing zhou 2
Abstract:A uniaxial rate dependent constitutive model for the concrete materials is constructed on the basis of the irreversible thermodynamics. The model describes such properties of the concrete as that initial yield strength is zero; the peak strength grows as the strain rate grows; both the hardening part and the softening part of the stress strain curve are smooth; the stress converges when the strain becomes infinitely large; the strain at the peak point does not vary as the loading strain rate grows. In addition, according to formerly experimental data, it is properly suggested that the consistency condition in the rate dependent constitutive model applies to the range where the loading strain rate is lower than its critical value, and this rate range is also the adaptable range of the model of the present paper.
Keywords:constitutive relation  irreversible process thermodynamics  concrete/consistency condition  rate  dependent
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