Chemoplastic Modelling for Concrete at High Temperature

Rabah Hammoud; Rachid Boukhili; Ammar Yahia

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Chemoplastic Modelling for Concrete at High Temperature

机译：混凝土高温化学模型

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A numerical model to simulate the impact of high temperature on the behavior of conventional concrete under chemoplastic framework is developed and validated. The model is based on new formulation of a constitutive law with new chemoplastic potential. By overlaying the chemoplastic potential on the modified Etse and Willam yielding surface, both defined on the Haigh-Westergaard coordinates, it was found that the two curves do not undergo similar stress state at the same strength parameter. For an adequate evaluation of normal vectors, each surface is forced to pass through the current stress state. Keeping the loading surface unchanged, the calculation of the plastic potential need to be modified. The proposed constitutive model is validated by comparing predicted and experimental data. The model is shown to be accurate to predict different stress states of concrete under different temperature levels.

机译：建立并验证了模拟高温对常规混凝土在化学塑性框架下性能的影响的数值模型。该模型基于具有新的化学潜在性的本构律的新公式化。通过在均定义在Haigh-Westergaard坐标上的修饰的Etse和Willam屈服表面上叠加化学势，可以发现两条曲线在相同的强度参数下不会经历相似的应力状态。为了对法向矢量进行足够的评估，每个表面都必须经过当前应力状态。在保持加载表面不变的情况下，需要修改塑性势的计算。通过比较预测和实验数据验证了所提出的本构模型。结果表明，该模型可以准确预测不同温度水平下混凝土的不同应力状态。

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来源
《Journal of structural fire engineering》 |2014年第2期|135-146|共12页
作者
Rabah Hammoud; Rachid Boukhili; Ammar Yahia;
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作者单位

Ecole Polytechnique de Montreal, Montreal (Quebec), Canada;

Ecole Polytechnique de Montreal, Montreal (Quebec), Canada;

Universite de Sherbrooke, Sherbrooke (Quebec), Canada;

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正文语种 eng
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关键词
Chemoplastic; Concrete; Constitutive law; Elastoplastic material; High temperature;

机译：化学性具体;宪法弹塑性材料;高温;

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专利

1. Chemoplastic material model for the simulation of early-age cracking: From the constitutive law to numerical analyses of massive concrete structures [J] . Roman Lackner, Herbert A. Mang Cement & concrete composites . 2004,第5期

机译：用于模拟早期开裂的化学材料模型：从本构定律到大型混凝土结构的数值分析
2. `Chunnel' fire. I: Chemoplastic softening in rapidly heated concrete [J] . Ulm Franz-Josef, Bazant Zdenek P., Coussy Olivier Journal of Engineering Mechanics . 1999,第3期

机译：通道火。 I：快速加热的混凝土中的化学增塑
3. Constitutive modeling of cementitious materials in the framework of chemoplasticity [J] . R. Lackner, Ch. Hellmich, H. A. Mang International Journal for Numerical Methods in Engineering . 2002,第10期

机译：化学可塑性框架下胶结材料的本构模型
4. CHEMOPLASTIC MATERIAL MODEL FOR THE SIMULATION OF EARLY-AGE CRACKING: FROM EXPERIMENTS TO THE CONSTITUTIVE LAW [C] . Roman Lackner, Herbert A. Mang Conference on Early Age Cracking in Cementitious Systems - EAC'01, Mar 12-14, 2001, Haifa, Israel . 2001

机译：模拟开裂的化学塑性材料模型：从实验到本构法
5. A Numerical Investigation of Fractional Models for Viscoelastic Materials with Applications on Concrete Subjected to Extreme Temperatures [D] . Macnamara, Murray. 2021

机译：粘弹性材料分数模型的数值研究与混凝土对极端温度的影响
6. A Study of the Flexural Behavior of Fiber-Reinforced Concretes Exposed to Moderate Temperatures [O] . Marta Caballero-Jorna, Marta Roig-Flores, Pedro Serna 2021

机译：纤维增强混凝土弯曲行为的研究暴露于中等温度
7. Mechanical properties of various concrete after high temperature exposure Mechanical property of various types of concrete after high temperature exposure is investigated. Considering compressive strength requirement for a vertical element in high rise building, concrete specimens with various design strengths of 35, 80, 100, and 150 MPa were tested. Particularly, the influence of incorporated steel fiber on fire resistance is of interest in this study. Experimental results show that the fire resistance depends on the design strength and steel fiber content. Normal strength concrete (NSC) of a design strength of 35 MPa or high performance concrete (HPC) of 80-100 MPa does not spall when exposed to 100-400 °C of temperature. However, an explosive spalling occurs at 300 °C when the HPCs contain 1 vol. of steel fiber. Ultra-high performance concrete (UHPC) of a design strength of 150 MPa and 1.5 vol. of steel fiber also shows dramatic spalling at 300 °C. The experimental results found in this study can contribute to a better understanding of the behaviors of HPC and UHPC under fire and the role of steel fiber on the fire resistance. [O] . 2017

机译：研究了高温暴露后各种混凝土高温曝光机械性能各种混凝土的机械性能。考虑到高层建筑中垂直元件的抗压强度要求，测试了35,80,100和150MPa各种设计强度的混凝土试样。特别是，在这项研究中，掺入钢纤维对耐火性的影响。实验结果表明，耐火性取决于设计强度和钢纤维含量。在暴露于100-400°C的温度时，80-100MPa的设计强度为35MPa或高性能混凝土（HPC）的正常强度混凝土（NSC）不会击落。然而，当HPC含有1体积的钢纤维的百分比时，爆炸性剥落发生在300℃。超高性能混凝土（UHPC）的设计强度为150 MPa和1.5 Vol。钢纤维的百分比也显示出300℃的剧烈剥落。本研究中发现的实验结果可以有助于更好地了解在火灾中的HPC和UHPC的行为以及钢纤维对耐火性的作用。

Chemoplastic Modelling for Concrete at High Temperature

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