BEARING CAPACITY, DEFORMITY AND CRACK RESISTANCE OF DAMAGED BEAMS REINFORCED WITH FIBER CONCRETE

S. Neutov, Vakhtanh Yesvandzhyia
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Abstract

The results of experimental studies of the load-bearing capacity, deformability and crack resistance of damaged beams reinforced with fiber concrete in the compressed and stretched zone are presented. Test samples are made of concrete and fiber concrete. The amount of steel fiber in fiber concrete is 2% of the volume of the product. Preliminary tests were carried out on prisms and cubes. During the manufacture of beam samples, before concreting, a foam insert was installed in the area of planned damage, the shape and dimensions of which corresponded to the damage. After the concrete set to 70% grade strength, the liner was pulled out, and the resulting cavity was filled with a 2% mixture of fiber concrete. Tests of material samples showed that the introduction of steel fiber into the composition of concrete in the amount of 2% by volume increases the compressive strength limit by 15.3%. The initial modulus of elasticity of fiber concrete of the specified mixture is 38.0% higher than that of ordinary concrete of this composition. Conducted experimental studies of damaged beams showed that a beam whose cross-section is 40% damaged in the middle-compressed zone, and the shape of the damage is close to rectangular, has a load-bearing capacity of 92.0 kN, or 93.9% of the load-bearing capacity of an undamaged beam. Cracking started at the 4th loading stage, when the load value was 26.0kN, i.e. 28.3% of the bearing capacity of the damaged beam. The maximum final crack opening width was 0.6 mm. A beam whose section is 40% damaged in the mid-stretch zone has a load-bearing capacity of 92.4 kN, or 93.2% of the load-bearing capacity of an undamaged beam. Cracking started at the 5th loading stage, when the load was 32.5kN, i.e. 35.2% of the bearing capacity of the damaged beam. The maximum final crack opening width was 0.8 mm. It is claimed that the strengthening of a beam with 40% damage in the compressed or stretched zone in the manner considered in the paper is effective, as it allows achieving its load-bearing capacity, which is more than 93% of the load-bearing capacity of an undamaged beam.
用纤维混凝土加固的受损梁的承载力、变形和抗裂性
本文介绍了对使用纤维混凝土加固的受损梁在压缩区和拉伸区的承载能力、变形能力和抗裂能力的实验研究结果。试验样品由混凝土和纤维混凝土制成。纤维混凝土中的钢纤维含量为产品体积的 2%。初步试验在棱柱和立方体上进行。在制作梁样时,在浇筑混凝土之前,在计划损坏的区域安装了泡沫插件,其形状和尺寸与损坏处一致。混凝土凝固至 70% 的强度等级后,拔出衬垫,并用 2% 的纤维混凝土混合物填充由此产生的空腔。对材料样本的测试表明,在混凝土成分中加入 2% 体积分数的钢纤维后,抗压强度极限提高了 15.3%。指定混合物纤维混凝土的初始弹性模量比该成分的普通混凝土高 38.0%。对受损梁进行的实验研究表明,横截面在中间受压区受损 40%,且受损形状接近矩形的梁,其承载能力为 92.0 千牛,或未受损梁承载能力的 93.9%。裂缝始于第 4 个加载阶段,当时的荷载值为 26.0kN,即受损梁承载力的 28.3%。最终开裂的最大宽度为 0.6 毫米。截面在中间拉伸区损坏 40% 的横梁的承载能力为 92.4 千牛,即未损坏横梁承载能力的 93.2%。裂缝始于第 5 个加载阶段,此时荷载为 32.5kN,即受损梁承载力的 35.2%。最终开裂的最大宽度为 0.8 毫米。本文认为,以本文所考虑的方式加固在压缩或拉伸区有 40% 损伤的横梁是有效的,因为这样可以达到其承载能力,超过未损坏横梁承载能力的 93%。
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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