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Experimental and numerical study on cable breakage equivalent force in cable-stayed structures consisting of low-relaxation seven-wire steel strands
Structures ( IF 4.1 ) Pub Date : 2020-06-24 , DOI: 10.1016/j.istruc.2020.05.028
A. Minaei , F. Daneshjoo , José M. Goicolea

Investigation of a global structural dynamics model of a cable-stayed structure subjected to the cable breakage event requires the determination of the Cable Breakage Equivalent Force with respect to time [CBEF(t)]. The CBEF(t) is an applied axial force to the structure from the stay cable considered to break which is reduced from before the breakage to after the breakage. In this study, a generic CBEF(t) in cable-stayed structures consisting of low-relaxation seven-wire steel strands is obtained experimentally and numerically. The generic CBEF(t) can be introduced in a global structural dynamics model of a cable-stayed structure directly, without the need of a very detailed and costly model for the cable breakage. An experimental program was performed as representative of a stay cable, for which three different lengths of the 3/8-inch strand were tested. A full 3D finite element (FE) model was also developed in ABAQUS/Explicit in which, by a predefined imperfection, the breakage location corresponding to the experimental observation was assigned to the FE models of the 3/8-inch and 0.6-inch strands. The results reveal that the CBEF(t) is determined in two time intervals: a tensile rectangular force in the first and a compressive force in the second. Moreover, the breakage location affects the CBEF(t), while the CBEF(t) is independent of the total length of the unbroken strand, lubricating, and the interaction between the broken cable and the damaged cable-stayed structure. The comparison between wires shows that the main part of the CBEF(t) is related to a center wire. In the last part of this paper, a simplified and generic CBEF(t) is proposed which can be used for global dynamics models of all cable-stayed structures with 3/8-inch and 0.6-inch strands.



中文翻译:

低弛缓七线钢绞线斜拉结构中电缆断裂当量的试验和数值研究

对遭受电缆断裂事件的斜拉结构的整体结构动力学模型的研究需要确定相对于时间[CBEF(t)]的电缆断裂当量力。CBEF(t)是从被认为断裂的斜拉索施加到结构的轴向力,该轴向力从断裂之前减小到断裂之后。在这项研究中,通过实验和数值方法获得了由低松弛的七线钢绞线组成的斜拉结构中的通用CBEF(t)。通用CBEF(t可以直接将其引入斜拉结构的全局结构动力学模型中,而无需非常详细且昂贵的电缆断裂模型。执行了代表拉索的实验程序,针对该拉索测试了三种不同长度的3/8英寸绞线。还在ABAQUS / Explicit中开发了完整的3D有限元(FE)模型,其中,通过预定义的缺陷,将与实验观察值相对应的断裂位置分配给3/8英寸和0.6英寸钢绞线的FE模型。结果表明,CBEF(t)是在两个时间间隔中确定的:第一个时间为拉伸矩形力,第二个时间为压缩力。此外,破损位置会影响CBEF(t),而CBEF(tt)与不间断钢绞线的总长度,润滑以及断裂的电缆和受损的斜拉结构之间的相互作用无关。导线之间的比较表明CBEF(t)的主要部分与中心导线有关。在本文的最后一部分中,提出了一种简化且通用的CBEF(t),可将其用于具有3/8英寸和0.6英寸股的所有斜拉结构的整体动力学模型。

更新日期:2020-06-24
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