Numerical study on the progressive collapse of cable-stayed columns due to cable loss

IF 5.7 1区工程技术 Q1 ENGINEERING, CIVIL

Thin-Walled Structures Pub Date : 2025-05-10 DOI:10.1016/j.tws.2025.113439

Michał Kierat , Fabio Freddi

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引用次数: 0

Abstract

Extreme loading events, such as accidents, impacts, or malicious attacks, may generate local failures that can propagate to subsequent elements, leading to the ultimate collapse of a structure. Research into progressive collapse has mainly focused on structures characterised by high levels of redundancy (e.g., moment-resisting frames). Conversely, little attention has been given to low-redundant structures (e.g., cable-stayed), which may be characterised by higher vulnerability to progressive collapse due to limited alternative load paths. This paper focuses on a distinct form of cable-stayed structures, i.e., cable-stayed columns, evaluating their robustness by considering a cable loss scenario and identifying measures able to reduce the risk of progressive collapse. A variety of bay/branch configurations with fixed and pinned cross-arms were investigated through Finite Element (FE) models developed in OpenSees, accounting for material and geometric non-linearities. An extensive parametric study was initially performed to evaluate the influence of variables on the load-carrying capacity. Cable loss scenarios were successively simulated in non-linear quasi-static and dynamic analyses. Incremental Dynamic Analyses (IDAs) were also conducted to estimate Dynamic Increase Factors (DIFs) for mid-node displacement, axial, and reaction forces (proxy for load-carrying capacity) for several non-dimensional slenderness ratios. In all cases, significant reductions in the buckling load were recorded, with dynamic effects amplifying the columns’ response. The present paper sheds light on the performance and design of cable-stayed columns under cable loss scenarios. The results show that, whilst additional branches in the geometric configuration were found to be beneficial in maintaining capacities under cable loss, the appropriate selection of cross-arm profile and its bending stiffness were vital in reducing the risk of collapse.

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索损作用下斜拉柱逐渐倒塌的数值研究

极端加载事件，如事故、冲击或恶意攻击，可能会产生局部故障，并可能传播到后续元素，导致结构的最终崩溃。对渐进式倒塌的研究主要集中在以高冗余度为特征的结构上（例如，抗矩框架）。相反，很少关注低冗余结构（例如斜拉索），由于有限的可选荷载路径，其特征可能是更容易发生渐进式倒塌。本文着重于斜拉结构的一种独特形式，即斜拉柱，通过考虑缆索损失情景和确定能够降低逐步倒塌风险的措施来评估其稳健性。通过OpenSees开发的有限元（FE）模型，考虑材料和几何非线性，研究了具有固定和固定交叉臂的各种凸台/分支构型。最初进行了广泛的参数研究，以评估变量对承载能力的影响。在非线性准静态和动态分析中分别模拟了电缆损耗情况。还进行了增量动态分析（IDAs），以估计几种无量纲长细比的中节点位移、轴向和反作用力（承载能力的代理）的动态增加因子（DIFs）。在所有情况下，屈曲载荷的显著降低都被记录下来，动力效应放大了柱的响应。本文对斜拉柱在失缆情况下的性能和设计进行了阐述。结果表明，虽然在几何结构中发现额外的分支有利于保持电缆损耗下的能力，但适当选择横臂轮廓及其弯曲刚度对于降低倒塌风险至关重要。

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

Thin-Walled Structures 工程技术-工程：土木

CiteScore

9.60

自引率

20.30%

发文量

801

审稿时长

66 days

期刊介绍： Thin-walled structures comprises an important and growing proportion of engineering construction with areas of application becoming increasingly diverse, ranging from aircraft, bridges, ships and oil rigs to storage vessels, industrial buildings and warehouses. Many factors, including cost and weight economy, new materials and processes and the growth of powerful methods of analysis have contributed to this growth, and led to the need for a journal which concentrates specifically on structures in which problems arise due to the thinness of the walls. This field includes cold– formed sections, plate and shell structures, reinforced plastics structures and aluminium structures, and is of importance in many branches of engineering. The primary criterion for consideration of papers in Thin–Walled Structures is that they must be concerned with thin–walled structures or the basic problems inherent in thin–walled structures. Provided this criterion is satisfied no restriction is placed on the type of construction, material or field of application. Papers on theory, experiment, design, etc., are published and it is expected that many papers will contain aspects of all three.