A Comparative Study on the Confinement Models of High-Strength Steel Fiber Concrete

N. F. F. Cholida, Antonius, Lintang Enggartiasto
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引用次数: 1

Abstract

Since the last four decades, the behavior of concrete contains of steel fiber, or often called steel fiber concrete, with a wide range of compressive strength has been carried out. Generally, the results of the experimental program produced a material which has a more ductile compared with normal concrete or concrete without fiber. Due to the ductility properties of the material, it is very suitable for use as an earthquake-resistant structural material. At the same time, the behavior of high-strength steel-fiber concrete has also investigated, one of which is about confined high-strength steel-fiber concrete. Analytical models of confined high-strength steel fiber concrete have been developed in various preliminary studies, with their characteristics derived based on the experimental results. Therefore, this research evaluated the models of confined high-strength steel-fiber concrete proposed by Mansur et al., Hsu and Hsu, and Paultre et al. The evaluation includes stress-strain behavior, strength enhancement of confined concrete (f'cc/f'co) or K value, the increase in confined concrete strain (ε'cc/ε'co), and strain of confined concrete when the stress has dropped by 50 percent against its unconfined strain (εcc50/εc50). The comparison method was carried out using a statistical approach and stress-strain simulation. Evaluation results showed significant predictive differences in confinement models in terms of post-peak behavior and parameters ε'cc/ε’co and εcc50/εc50. Prediction of confinement models on the value of f'cc/f’co to the experimental results has a coefficient of variation above 10%. The result further showed that a modified model of confined high-strength steel-fiber concrete was proposed and able to simulate the stress-strain behavior.
高强钢纤维混凝土约束模型的比较研究
近四十年来,人们对含有钢纤维的混凝土,或常称为钢纤维混凝土的抗压强度进行了广泛的研究。一般来说,实验程序的结果产生的材料比普通混凝土或无纤维混凝土具有更大的延展性。由于材料的延展性,它非常适合用作抗震结构材料。同时,对高强钢纤维混凝土的性能进行了研究,其中一项是对承压高强钢纤维混凝土的性能进行了研究。在各种初步研究中建立了约束高强钢纤维混凝土的分析模型,其特征是基于试验结果得出的。因此,本研究对Mansur et al.、Hsu and Hsu、paulte et al.提出的承压高强钢纤维混凝土模型进行了评价。评估包括应力-应变特性、约束混凝土强度增强(f'cc/f'co)或K值、约束混凝土应变增加(ε'cc/ε'co)以及应力相对于非约束应变下降50%时约束混凝土的应变(εcc50/εc50)。采用统计方法和应力-应变模拟方法进行对比。评价结果表明,约束模型在峰后行为、ε'cc/ε ' co和εcc50/εc50参数方面的预测差异显著。约束模型对f'cc/f 'co值的预测与实验结果的变异系数在10%以上。结果进一步表明,提出了一种改进的约束型高强钢纤维混凝土模型,能够较好地模拟约束型高强钢纤维混凝土的应力-应变特性。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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