Performance of eccentrically loaded low‐strength RC columns confined with posttensioned metal straps: An experimental and numerical investigation

IF 3 3区工程技术 Q2 CONSTRUCTION & BUILDING TECHNOLOGY

Structural Concrete Pub Date : 2024-09-03 DOI:10.1002/suco.202301026

Ram Prasad Neupane, Thanongsak Imjai, Reyes Garcia, Yie Sue Chua, Sandeep Chaudhary

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Abstract

This study experimentally and numerically examines the performance of low‐strength reinforced concrete (LS RC) columns confined with external post‐tensioned metal straps (PTMS). Twelve square columns of cross‐section 125 × 125 mm and height 1500 mm were subjected to axial load, with eight columns being eccentrically loaded. Four columns were control specimens without confinement, and another eight were confined using a novel technique that provides active confinement through the PTMS. The main parameters investigated included the PTMS confinement ratio (ρv = 0.64% and 1.28%) and different eccentricities (e/b = 0, 0.25, 0.5 or 1.0, where e = eccentricity). The results show that the capacity and axial displacement of the PTMS‐confined columns increased by up to 43% and 116% over unconfined control columns. Finite element analyses of the columns were carried out in Abaqus® to provide further insight into the behavior of PTMS‐confined columns. This study contributes towards developing cost‐effective confinement solutions for LS RC columns, thus encouraging the broader adoption of active confinement techniques in practical strengthening applications.

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用后张金属带约束的偏心加载低强度 RC 柱的性能：实验和数值研究

本研究通过实验和数值计算检验了采用外部后张金属带（PTMS）约束的低强度钢筋混凝土（LS RC）柱的性能。12 根横截面为 125 × 125 毫米、高度为 1500 毫米的方形柱子承受了轴向荷载，其中 8 根柱子承受了偏心荷载。其中四根柱子为无约束的对照试样，另外八根柱子则采用了一种通过 PTMS 提供主动约束的新技术进行约束。研究的主要参数包括 PTMS 约束比（ρv = 0.64% 和 1.28%）和不同的偏心率（e/b = 0、0.25、0.5 或 1.0，其中 e = 偏心率）。结果表明，与未加固的对照柱相比，加固 PTMS 的柱子的承载力和轴向位移分别增加了 43% 和 116%。我们使用 Abaqus® 对支柱进行了有限元分析，以进一步了解 PTMS 密闭支柱的行为。这项研究有助于为 LS RC 柱开发具有成本效益的约束解决方案，从而鼓励在实际加固应用中更广泛地采用主动约束技术。

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

Structural Concrete CONSTRUCTION & BUILDING TECHNOLOGY-ENGINEERING, CIVIL

CiteScore

5.60

自引率

15.60%

发文量

284

审稿时长

3 months

期刊介绍： Structural Concrete, the official journal of the fib, provides conceptual and procedural guidance in the field of concrete construction, and features peer-reviewed papers, keynote research and industry news covering all aspects of the design, construction, performance in service and demolition of concrete structures. Main topics: design, construction, performance in service, conservation (assessment, maintenance, strengthening) and demolition of concrete structures research about the behaviour of concrete structures development of design methods fib Model Code sustainability of concrete structures.