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Discrete element framework for modeling tertiary creep of concrete in tension and compression

机译：张力和压缩混凝土三级蠕变的离散元素框架

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摘要

In this contribution, a computational framework for the analysis of tertiary concrete creep is presented, combining a discrete element framework with linear visco-elasticity and rate-dependency of damage. The Lattice Discrete Particle Model (LDPM) serves as constitutive model. Aging visco-elasticity is implemented based on the Micro-Prestress-Solidification (MPS) theory, linking the mechanical response to the underlying physical and chemical processes of hydration, heat transfer and moisture transport through a multi-physics approach. The numerical framework is calibrated on literature data, which include tensile and compressive creep tests, and tests at various loading rates. Afterwards, the framework is validated on time-to-failure tests, both for flexure and compression. It is shown that the numerical framework is capable of predicting the time-dependent evolution of concrete creep deformations in the primary, secondary but also tertiary domains, including very accurate estimates of times to failure. Finally, a predictive numerical study on the time-to-failure response is presented for load levels that are difficult to test experimentally, showing a deviation from the simple linear trend that is commonly assumed. Ultimately, two alternative functions for time-to-failure curves are proposed that are mechanically justified and in good agreement with both, experimental data and numerical simulations.
机译：在这一贡献中，提出了一种用于分析三级混凝土蠕变的计算框架，将离散元件框架与线性粘弹性和损伤率依赖性组合。晶格离散粒子模型（LDPM）用作本构模型。基于微观预应力 - 凝固（MPS）理论，实现了老化粘弹性，通过多物理方法将机械反应与水合，传热和水分运输的潜在物理和化学过程联系起来。在文献数据上校准数值框架，包括拉伸和压缩蠕变测试，并以各种装载速率测试。之后，框架在对弯曲和压缩时验证了对故障时间测试的验证。结果表明，数值框架能够预测初级，次级但第三个域中的混凝土蠕变变形的时间依赖性演变，包括非常准确的失效估算。最后，提出了对失效时间响应的预测数值研究，用于实验难以测试的负载水平，显示出与通常假设的简单线性趋势的偏差。最终，提出了两种替代功能，提出了与故障时间曲线进行机械合理的，并且与实验数据和数值模拟有关。

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