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首页> 外文期刊>Journal of Engineering Mechanics >Fracture mechanics model for analysis of plain and reinforced high-performance concrete beams
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Fracture mechanics model for analysis of plain and reinforced high-performance concrete beams

机译：普通高强混凝土梁分析的断裂力学模型

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摘要

In developing a one-dimensional analysis and design procedure for reinforced concrete structures, research is generally based on yield phenomena and the plastic flow of steel in tension and concrete in compression. The ability of concrete to resist tension is considered in the form of tension stiffening or is completely disregarded. This procedure does not account for the influence of structural size in changing the failure mode and the stress distribution across the uncracked or cracked ligament. The key factor affecting this stress distribution is found to be the strain-softening modulus. This paper presents an improved model that is based on the fundamental equilibrium equation for the progressive failure of plain concrete beams. The concrete stress-strain relationship in tension is derived by calculating the peak tensile stress, and softening modulus for different depths of beams on the basis of the fracture parameters obtained with the size effect law. Thus, the proposed model uses the peak tensile stress and the softening modulus, which vary depending on the size of the beam. To study the effect of the strength of high-performance concrete (HPC) on the concrete tensile stress-strain relationship, the experimental load-deflection plots of different-sized beams are compared with those obtained by using the proposed analytical model for eight different mixes made with locally available fly ash and slag. The model is also extended for lightly reinforced concrete beams, and the results are compared with those in the literature and are found to be in good agreement.
机译：在开发钢筋混凝土结构的一维分析和设计程序时，研究通常基于屈服现象以及受拉钢和受压混凝土的塑性流动。混凝土抵抗拉力的能力以拉力硬化的形式被考虑或被完全忽略。该程序没有考虑结构尺寸在改变破坏模式和未破裂或破裂的韧带上的应力分布方面的影响。发现影响该应力分布的关键因素是应变软化模量。本文提出了一种基于基本平衡方程的普通混凝土梁渐进破坏模型。通过基于尺寸效应定律获得的断裂参数，通过计算峰值拉伸应力和梁不同深度的软化模量，得出混凝土中的拉伸应力-应变关系。因此，提出的模型使用了峰值拉伸应力和软化模量，它们根据梁的大小而变化。为了研究高性能混凝土（HPC）的强度对混凝土拉伸应力-应变关系的影响，将不同尺寸梁的试验荷载-挠度图与使用建议的解析模型针对八种不同混合物获得的荷载-挠度图进行了比较。用当地可用的粉煤灰和矿渣制成。该模型还扩展到了轻钢筋混凝土梁，并且将结果与文献中的结果进行了比较，发现结果吻合良好。

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