Constitutive modeling of creep-fatigue interaction for normal strength concrete under compression
Constitutive modeling of creep-fatigue interaction for normal strength concrete under compression
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DOI：
10.1016/j.ijfatigue.2015.03.026
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发表时间：
2015-09-01
影响因子：
6
通讯作者：
Unger, Joerg F.
中科院分区：
文献类型：
--
作者：
Kindrachuk, Vitaliy M.;Thiele, Marc;Unger, Joerg F.
模拟疲劳失效的传统方法是基于作为载荷幅度的函数的寿命的表征。Wohler图与线性损伤累积假设相结合，预测了不同加载状态下的寿命。使用这种唯象的方法，损伤和非弹性应变的演变和应力的重新分布不能被建模。假定材料的逐渐退化不会改变应力状态。采用Palming-Miner损伤累积准则，忽略了非线性响应的阶次效应，建立了一个基于连续损伤力学的混凝土本构模型。该模型包括率相关的影响和现实再现逐步性能退化的正常强度混凝土下压缩静态，蠕变和循环荷载在一个统一的框架。损伤演化由非弹性变形驱动，并捕获实验观察到的应变率效应。实施细节进行了讨论。最后，通过蠕变、疲劳和三轴压缩试验数据的对比，验证了模型的正确性。(C)2015爱思唯尔有限公司版权所有。
Conventional approaches to model fatigue failure are based on a characterization of the lifetime as a function of the loading amplitude. The Wohler diagram in combination with a linear damage accumulation assumption predicts the lifetime for different loading regimes. Using this phenomenological approach, the evolution of damage and inelastic strains and a redistribution of stresses cannot be modeled. The gradual degration of the material is assumed to not alter the stress state. Using the Palmgren-Miner rule for damage accumulation, order effects resulting from the non-linear response are generally neglected.In this work, a constitutive model for concrete using continuum damage mechanics is developed. The model includes rate-dependent effects and realistically reproduces gradual performance degradation of normal strength concrete under compressive static, creep and cyclic loading in a unified framework. The damage evolution is driven by inelastic deformations and captures strain rate effects observed experimentally. Implementation details are discussed. Finally, the model is validated by comparing simulation and experimental data for creep, fatigue and triaxial compression. (C) 2015 Elsevier Ltd. All rights reserved.