Micromechanical analysis of concrete and reinforcing steel exposed to high temperature

Guruprasad Y. K.; Ramaswamy Ananth

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Micromechanical analysis of concrete and reinforcing steel exposed to high temperature

机译：高温下混凝土和钢筋的微力学分析

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摘要

This study discusses determination of macroscale properties of concrete and reinforcing steel from micromechanical properties (elastic modulus) of individual phases in concrete (coarse aggregate, mortar), and reinforcing steel that have been exposed to high temperature through micro-indentation of their respective samples. Micro-indentation results are obtained by performing grid indentation. These results are then statistically analyzed through a deconvolution technique and a self-consistent homogenization scheme, to obtain the mechanical properties at macroscale. These obtained properties from samples are useful in assessing the nature and extent of damage that has taken place in concrete or steel due to high temperature expressed in terms of stiffness reduction. As a consequence this can provide a basis for designing a suitable structural repair with an understanding of the force flow in the element. Micro indentation of concrete samples in hot state has also been undertaken, and these results suggest that combined thermos-mechanical loads result in more degradation of concrete due to thermo-mechanical coupling. Results of elastic modulus obtained from homogenization of micro-indentation data and the elastic modulus obtained from macroscale tests are in good agreement. (C) 2017 Elsevier Ltd. All rights reserved.

机译：这项研究讨论了通过混凝土（粗骨料，砂浆）和通过各自样品的微观压痕暴露于高温的钢筋中各相的微机械性能（弹性模量）来确定混凝土和钢筋的宏观性能。通过执行网格压痕可以获得微压痕结果。然后，通过反卷积技术和自洽均质化方案对这些结果进行统计分析，以获得宏观的机械性能。从样品中获得的这些特性可用于评估由于以刚度降低表示的高温而对混凝土或钢造成的破坏的性质和程度。因此，这可以为设计适当的结构修补件提供基础，同时了解元件中的力流。还对热状态下的混凝土样品进行了微压痕，这些结果表明，由于热力耦合，热力-机械载荷的组合会导致混凝土的更多降解。从微观压痕数据的均质化获得的弹性模量结果与从宏观测试获得的弹性模量结果吻合良好。（C）2017 Elsevier Ltd.保留所有权利。

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来源
《Construction and Building Materials》 |2018年第15期|761-773|共13页
作者
Guruprasad Y. K.; Ramaswamy Ananth;
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作者单位

Indian Inst Sci, Dept Civil Engn, Bangalore 560012, Karnataka, India;

Indian Inst Sci, Dept Civil Engn, Bangalore 560012, Karnataka, India;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);
原文格式 PDF
正文语种 eng
中图分类
关键词
Concrete; Reinforcing steel; High temperature exposure; Micro indentation; Homogenization;

机译：混凝土;钢筋;高温暴露;微压痕;均质化;

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3. Analysis of the residual yield (fy) and ultimate (fu) stress of steel reinforcing bars from concrete columns exposed to elevated temperatures [J] . Tutikian Bernardo Fonseca, Lerner Lucas Rafael, Ehrenbring Hinoel Zamis, Ambiente Construído . 2021,第1期

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机译：用钢纤维加强的反应性粉末混凝土暴露在高温下
5. FINITE ELEMENT ANALYSIS OF FIRE-EXPOSED REINFORCED CONCRETE COLUMN (REINFORCED CONCRETE). [D] . KISHYSH, KADHUM OTHMAN. 1986

机译：火灾后钢筋混凝土柱（钢筋混凝土）的有限元分析。
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。

Micromechanical analysis of concrete and reinforcing steel exposed to high temperature

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