Design against failure of structural concrete elements near points of contraflexure

Kotsovos Michael D.

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Design against failure of structural concrete elements near points of contraflexure

机译：抗弯点附近结构混凝土构件破坏的设计

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In spite of the considerable number of reinforced-concrete structures invariably suffering earthquake damage in the regions of points of contraflexure of their beam or column elements, research on the subject to date has been sparse. This work discusses the causes of such damage and proposes a simple design method that does not require calibration through the use of experimental data. A comparison of the proposed method's predictions with experimental information and the predictions of typical current code methods not only demonstrates the validity of the proposed method, but also confirms the shortcomings of current design practice.

机译：尽管在其梁或柱单元的反弯点区域中有相当数量的钢筋混凝土结构无一例外地遭受地震破坏，但迄今为止对该问题的研究很少。这项工作讨论了这种损坏的原因，并提出了一种简单的设计方法，该方法不需要通过使用实验数据进行校准。将所提方法的预测结果与实验信息进行比较，并与典型的当前代码方法的预测结果进行比较，不仅证明了所提方法的有效性，而且也证实了当前设计实践的不足。

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来源
《Magazine of Concrete Research》 |2019年第2期|2-13|共12页
作者
Kotsovos Michael D.;
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作者单位

Natl Tech Univ Athens, Civil Engn Dept, Athens, Greece;

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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
beams girders; British standards codes of practice; shear; structural design;

机译：梁和大梁;英国标准和操作规范;剪切;结构设计;

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1. Contribution of Nonlinear Finite-Element Analysis to Evaluation of Two Structural Concrete Failures [J] . F. J. Vecchio Journal of Performance of Constructed Facilities . 2002,第3期

机译：非线性有限元分析对两个结构混凝土故障评估的贡献
2. Energy based load-impulse diagrams with multiple failure modes for blast-loaded reinforced concrete structural elements [J] . Tsai Ying-kuan, Krauthammer Ted Engineering failure analysis . 2019,第期

机译：具有多种故障模式的基于能量的负载冲击图，用于加载钢筋混凝土结构元件
3. Behavior of Patch-Repaired Concrete Structural Elements under Increasing Static Loads to Flexural Failure [J] . O. Rio, C. Andrade, D. Izquierdo, Journal of materials in civil engineering . 2005,第2期

机译：在增加静载荷至弯曲破坏的情况下修补修补混凝土结构元件的行为
4. Design of safe timber structures - How can we learn from structural failures in concrete, steel and timber? [C] . Eva FRUEHWALD, Sven THELANDERSSON World conference on timber engineering . 2008

机译：安全的木结构设计-我们如何从混凝土，钢材和木材的结构破坏中学习？
5. Local buckling of slender reinforced concrete structural elements by finite element method. [D] . Zhang, Xianghui. 1995

机译：细长钢筋混凝土结构构件的局部屈曲有限元方法。
6. 2D Digital Image Correlation and Region-Based Convolutional Neural Network in Monitoring and Evaluation of Surface Cracks in Concrete Structural Elements [O] . Marek Słoński, Marcin Tekieli 2020

机译：混凝土结构元素表面裂纹监测与评价中的2D数字图像相关与区域卷积神经网络
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。
8. User's Guide: A Computer Program for Strength Analysis of Non-Hydraulic Concrete Structural Elements. Report 2. Strength Design of Reinforced Concrete Column Sections (PCAUC) [R] . Hamby, C. C., Martin, D. K., Galyean, W. E. 1984

机译：用户指南：非水工混凝土结构构件强度分析的计算机程序。报告2.钢筋混凝土柱截面的强度设计（pCaUC）

Design against failure of structural concrete elements near points of contraflexure

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