Tension-Stiffening of Reinforced HVFA-SCC Beams

IF 1 Q4 ENGINEERING, CIVIL Jordan Journal of Civil Engineering Pub Date : 2023-07-10 DOI:10.14525/jjce.v17i3.11

Muhammad Fajrul Falah, Stefanus Adi Kristiawan, Halwan Alfisa Saifullah

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Abstract

Prediction of cracking behavior and deformation of reinforced concrete is a complex problem, including reinforced concrete that can still bear tensile stress after cracking due to the bond between reinforcement and surrounding concrete, termed the tension-stiffening effect. This research aims to determine the tension-stiffening of reinforced High Volume Fly Ash Self-compacting Concrete (HVFA-SCC) at various tensile reinforcement ratios. In this tension-stiffening analysis, shrinkage and creep effects are taken away. The data used in the analysis was obtained from beams tested with two loading points. The tests were conducted on six reinforced HVFA-SCC beams and six Normal Concrete (NC) beams with dimensions of 150 x 250 x 2000 mm, with tensile reinforcement ratios of 0.61%, 1.10% and 1.55%. The analysis shows that the effect of creep on shrinkage is negligible, so that it can be ignored in the calculation. On the other hand, shrinkage increases the value of the maximum tension-stiffening stress by 1.43% and the ultimate tension-stiffening stress (𝜎𝑡𝑠,u) by 72.51% from the initial tension-stiffening values. The greater the tensile reinforcement ratio in concrete, the smaller the effect of tension-stiffening stress. KEYWORDS: Creep, HVFA-SCC, NC, RC beams, Shrinkage, Tension-stiffening.

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加强型HVFA-SCC梁的张拉加劲

钢筋混凝土的开裂行为和变形预测是一个复杂的问题，包括钢筋混凝土在开裂后仍能承受拉应力，这是由于钢筋与周围混凝土之间的结合，称为拉-加筋效应。本研究旨在确定加筋高体积粉煤灰自密实混凝土(HVFA-SCC)在不同抗拉配筋率下的抗拉加劲性能。在这种拉伸-加筋分析中，收缩和蠕变效应被剔除。分析中使用的数据来自具有两个加载点的梁试验。试验采用6根尺寸为150 × 250 × 2000 mm的HVFA-SCC加筋梁和6根普通混凝土(NC)梁，受拉配筋率分别为0.61%、1.10%和1.55%。分析表明，蠕变对收缩的影响可以忽略不计，在计算中可以忽略。收缩使最大拉加劲应力值比初始拉加劲值增加1.43%，使极限拉加劲应力(φ𝑡𝑠，u)比初始拉加劲值增加72.51%。混凝土中受拉配筋率越大，受拉加筋应力的影响越小。关键词:徐变，HVFA-SCC, NC, RC梁，收缩，张拉加劲。

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来源期刊

Jordan Journal of Civil Engineering ENGINEERING, CIVIL-

CiteScore

2.10

自引率

27.30%

发文量

期刊介绍： I am very pleased and honored to be appointed as an Editor-in-Chief of the Jordan Journal of Civil Engineering which enjoys an excellent reputation, both locally and internationally. Since development is the essence of life, I hope to continue developing this distinguished Journal, building on the effort of all the Editors-in-Chief and Editorial Board Members as well as Advisory Boards of the Journal since its establishment about a decade ago. I will do my best to focus on publishing high quality diverse articles and move forward in the indexing issue of the Journal.