Impact performance of concrete-filled steel tubular columns under debris-flow-induced boulder impacts

IF 4 2区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Journal of Constructional Steel Research Pub Date : 2025-06-19 DOI:10.1016/j.jcsr.2025.109671

Ben Mou , Yongchao Guo , Le Huang

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引用次数: 0

Abstract

Western China is considered extremely active and hazardous areas prone to debris flows. These significantly threaten the safety of high-speed railway bridges. High-speed railway bridge piers usually adopt circular concrete-filled steel tubular (CCFST) columns. This paper investigates the dynamic responses of circular hollow steel tubular (CCHST) columns and CCFST columns under lateral impact loading, simulating the boulder impacts typical of debris flow conditions. Drop hammer tests were conducted and the key test parameters included hammer weight, height, indenter radius, built-in reinforcement bars (with or without), shear-span ratio, column diameter-to-thickness ratio, and dimensions. Additionally, the finite element models of CCFST and CCHST columns were established and validated against experimental results. The results revealed that CCFST columns exhibit superior lateral impact resistance, good plastic deformations, and high energy dissipation capacity. The built-in reinforcement bars improved lateral impact resistance capacity. The mechanical behavior of specimens under lateral impact loading was precisely forecasted by the developed finite element model.

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碎石冲击下钢管混凝土柱的冲击性能研究

中国西部被认为是非常活跃和危险的地区，容易发生泥石流。这些都严重威胁着高速铁路桥梁的安全。高速铁路桥墩通常采用圆形钢管混凝土柱。本文模拟典型泥石流条件下的圆钢管（CCHST）柱和空心钢管（CCFST）柱在侧向冲击荷载作用下的动力响应。进行落锤试验，主要试验参数包括锤重、高度、压头半径、内置钢筋（带或不带）、剪跨比、柱径厚比、尺寸等。建立了CCFST和CCHST柱的有限元模型，并与试验结果进行了对比验证。结果表明：CCFST柱具有较好的抗侧冲性能、良好的塑性变形和较高的耗能能力。内置的钢筋提高了抗侧向冲击能力。所建立的有限元模型能准确预测试件在侧向冲击载荷作用下的力学行为。

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

Journal of Constructional Steel Research 工程技术-工程：土木

CiteScore

7.90

自引率

19.50%

发文量

550

审稿时长

46 days

期刊介绍： The Journal of Constructional Steel Research provides an international forum for the presentation and discussion of the latest developments in structural steel research and their applications. It is aimed not only at researchers but also at those likely to be most affected by research results, i.e. designers and fabricators. Original papers of a high standard dealing with all aspects of steel research including theoretical and experimental research on elements, assemblages, connection and material properties are considered for publication.