EFFECT OF THE STRANDS FIXITY PROFILE SHAPE ON THE FLEXURAL BEHAVIOR OF STEEL BEAMS

Journal of Engineering and Sustainable Development Pub Date : 2024-05-01 DOI:10.31272/jeasd.28.3.5

Mohammed Rasheed, K. Mahmoud, M. A. Yousif, Ahmed F. Abdullah

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Abstract

This study concerns the effect of the external prestressing strand shape profile on the flexural behavior of steel beams. Seven steel beams that have the same cross-section are strengthened by external strands fixed by using Saddle Points of Deviation (Deviators). Based on two criteria, beams tested are divided into two categories whether external prestressing with fixity strands is present. The first group includes only one beam as a reference, while the second group deals with beams strengthened by two external strands. Six samples have been separated according to the eccentricity for external prestressing at a jacking stress of 815 MPa. During testing, it was discovered that the moment-curvature responses at the bottom and top flange region were stiffer than those in the reference, and the degree of hardening increases with eccentricity increasing. However, failure occurs with a slight warning as a result of insufficient ductility. Due to the presence of external prestressing, the ultimate moment capacity is enhanced by approximately 6.1%, 31.7%, 38.5%, 57.6%, 29.4%, and 80.2% as compared to the reference. Finally, the radius of curvature at the top flange region for strengthening samples has grown by approximately -16.7%, 8.0%, -26.9%, 21.5%, 17.5%, and 17.4% as compared to the reference case. In contrast, the percentage of the radius of curvature at the bottom flange region for strengthened samples dropped to 24,9%, 73.9%, 83.2%, 83.6%, 69.2%, and 89.0%, respectively, with an increase in the eccentricity position as compared to the reference.

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钢绞线固定轮廓形状对钢梁抗弯行为的影响

本研究涉及外部预应力钢绞线形状轮廓对钢梁抗弯行为的影响。七根横截面相同的钢梁通过使用鞍形偏差点（偏差点）固定外部钢绞线进行加固。根据两个标准，测试的钢梁被分为两类，一类是是否存在带固定钢绞线的外部预应力。第一类只包括作为参考的一根梁，而第二类则是由两根外部钢绞线加固的梁。在顶应力为 815 兆帕斯卡的条件下，根据外加预应力的偏心率将六个样本分开。在测试过程中发现，底部和顶部翼缘区域的弯矩-曲率响应比参考值更硬，而且硬化程度随着偏心率的增加而增加。然而，由于延展性不足，在发生破坏时会有轻微警告。由于外部预应力的存在，极限弯矩承载力与参考值相比分别提高了约 6.1%、31.7%、38.5%、57.6%、29.4% 和 80.2%。最后，与参考情况相比，加固样本顶部翼缘区域的曲率半径分别增加了约 -16.7%、8.0%、-26.9%、21.5%、17.5% 和 17.4%。相比之下，随着偏心位置的增加，强化样品底部法兰区域曲率半径的百分比分别下降到 24.9%、73.9%、83.2%、83.6%、69.2% 和 89.0%。

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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