Experimental Evaluation on LTB Strength of Steel Beams Externally Pre-stressed with Un-bonded Tendon Bar

IF 1.1 4区工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY

International Journal of Steel Structures Pub Date : 2024-04-12 DOI:10.1007/s13296-024-00830-x

Sung-Bo Kim, Agha Intizar Mehdi, Moon-Young Kim

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Abstract

A lateral-torsional buckling (LTB) experimental study has been firstly investigated for an externally pre-stressed (PS) steel beam with/without un-bonded central deviator. Analytical and numerical studies related to elastic LTB of the PS beam are abundant. However, an experimental study focusing on LTB behaviors of the PS steel beam is newly presented in this study. Six full-scale experimental specimens consisting of two usual steel beams without tendon bar, two PS steel beams under vertical loadings and two PS steel beams under increasing tendon force were tested. Load–strain/displacement behaviors of the specimens were obtained by measuring stains, lateral and vertical displacements. The numerical study of the geometric and material nonlinear behaviors of PS steel beams was evaluated based on the Riks method using ABAQUS. Finally, numerical and experimental results of load–strain/displacement behaviors of the usual and PS beams were investigated. The experimental and numerical results indicated that the LTB strength of steel beams could be greatly improved by prestressing system.

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无粘结筋条外部预应力钢梁 LTB 强度的实验评估

我们首次对带有/不带无粘结中心偏差的外部预应力（PS）钢梁进行了侧向扭转屈曲（LTB）实验研究。有关 PS 梁弹性 LTB 的分析和数值研究非常多。然而，本研究新近提出了一项针对 PS 钢梁 LTB 行为的实验研究。本研究测试了六个全尺寸实验试件，包括两个不带筋杆的普通钢梁、两个垂直荷载下的 PS 钢梁和两个增加筋力下的 PS 钢梁。通过测量污点、侧向和垂直位移，获得了试样的荷载-应变/位移行为。基于 Riks 方法，使用 ABAQUS 对 PS 钢梁的几何和材料非线性行为进行了数值研究。最后，研究了普通钢梁和 PS 钢梁的荷载-应变/位移行为的数值和实验结果。实验和数值结果表明，预应力系统可以大大提高钢梁的 LTB 强度。

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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来源期刊

International Journal of Steel Structures 工程技术-工程：土木

CiteScore

2.70

自引率

13.30%

发文量

122

审稿时长

12 months

期刊介绍： The International Journal of Steel Structures provides an international forum for a broad classification of technical papers in steel structural research and its applications. The journal aims to reach not only researchers, but also practicing engineers. Coverage encompasses such topics as stability, fatigue, non-linear behavior, dynamics, reliability, fire, design codes, computer-aided analysis and design, optimization, expert systems, connections, fabrications, maintenance, bridges, off-shore structures, jetties, stadiums, transmission towers, marine vessels, storage tanks, pressure vessels, aerospace, and pipelines and more.