Structural Behaviors of Steel Tube-encased Concrete Columns Confined by Bolted Circular Thin Steel Tube

IF 1.6 4区 工程技术 Q3 CONSTRUCTION & BUILDING TECHNOLOGY
Chi Zhang, Koki Yamaoka, Takashi Fujinaga, Yuping Sun
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引用次数: 0

Abstract

Six square steel tube-encased concrete (SC) columns confined by bolted circular thin steel tube were fabricated and tested under cyclical reversed lateral load to investigate their structural behavior. The primary experimental variables included the axial load ratio, the grade of the encased square steel tubes (FB rank and FC rank), the infilling of concrete into the encased steel tube, and the thickness of outer circular bolted thin steel tubes. Experimental results revealed that confinement by the bolted circular thin steel tube with outer-diameter-to-thickness ratio of 189 could ensure sufficient ductility to the SC columns, and the bolted thin steel tube did not rupture until the drift angle of about 0.09 rad. Furthermore, a simple evaluation method for the ultimate flexural strength of SC column section was proposed along with a numerical analytical method to predict the overall behavior of SC columns. The proposed methods can take the confinement effect by the bolted circular steel tube into consideration. Fairly good agreement between the experimental results and the calculated ones verified the reliability and accuracy of the proposed methods.

螺栓连接圆形薄钢管限制的钢管包裹混凝土柱的结构行为
我们制作了六根方形钢管包裹的混凝土(SC)柱,并在循环反向侧向荷载下对其进行了测试,以研究其结构行为。主要实验变量包括轴向荷载比、包裹方钢管的等级(FB 级和 FC 级)、包裹钢管中混凝土的填充量以及外层圆形螺栓薄钢管的厚度。实验结果表明,外径与厚度比为 189 的螺栓连接圆形薄钢管的约束可以确保 SC 柱具有足够的延性,并且螺栓连接薄钢管在漂移角约为 0.09 rad 时才会断裂。此外,还提出了一种简单的 SC 柱截面极限抗弯强度评估方法,以及一种预测 SC 柱整体行为的数值分析方法。所提出的方法考虑了螺栓连接圆钢管的约束效应。实验结果与计算结果相当吻合,验证了所提方法的可靠性和准确性。
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来源期刊
Journal of Advanced Concrete Technology
Journal of Advanced Concrete Technology 工程技术-材料科学:综合
CiteScore
3.70
自引率
10.00%
发文量
45
审稿时长
3.5 months
期刊介绍: JACT is fast. Only 5 to 7 months from submission to publishing thanks to electronic file exchange between you, the reviewers and the editors. JACT is high quality. Peer-reviewed by internationally renowned experts who return review comments to ensure the highest possible quality. JACT is transparent. The status of your manuscript from submission to publishing can be viewed on our website, greatly reducing the frustration of being kept in the dark, possibly for over a year in the case of some journals. JACT is cost-effective. Submission and subscription are free of charge . Full-text PDF files are available for the authors to open at their web sites. Scope: *Materials: -Material properties -Fresh concrete -Hardened concrete -High performance concrete -Development of new materials -Fiber reinforcement *Maintenance and Rehabilitation: -Durability and repair -Strengthening/Rehabilitation -LCC for concrete structures -Environmant conscious materials *Structures: -Design and construction of RC and PC Structures -Seismic design -Safety against environmental disasters -Failure mechanism and non-linear analysis/modeling -Composite and mixed structures *Other: -Monitoring -Aesthetics of concrete structures -Other concrete related topics
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