Multi-indicator evaluation method of important members of truss string structures

Wenhao Liu, Bin Zeng, Zhen Zhou, Yifan Zheng
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Abstract

During the past decade, the progressive collapse of structures has received growing attention, and the study of member importance is a key step for investigating the progressive collapse resistance. However, traditional methods for evaluating the member importance usually employ a single indicator, and when multiple indicators are involved, different indicators may generate different member rankings. Moreover, the truss string structure is a multiple super-stationary structure with many members, and the current studies mainly focus on cable failure, which does not mean that other members are not important. In this study, the initial selection of important members is first performed based on concept evaluation, and then, the alternate path method is used to analyze the progressive collapse resistance of truss string structures; the slope degradation coefficient γ of incremental dynamic analysis curve, load capacity degradation coefficient β, and nested load capacity degradation coefficient β′ are introduced; and the sensitivity coefficient SIj and fragility coefficient VIi are defined with axial force as the structural response. Based on the above five indicators, two cases are conducted to evaluate the member importance. The analysis results show that the cable and the bottom chord member at the support are evaluated as the first-level important members. Through the analysis of different indicators, it is found that the regularity of the coefficient of each member is inconsistent for different indicators. The results could be one-sided if the important members were evaluated by a single indicator only. In addition, the second-level important members of truss string structures are evaluated by multi-indicator analysis. Finally, the nominal progressive collapse resistance of truss string structures is given based on the importance coefficient of the first- and second-level important members.
桁架结构重要构件的多指标评估方法
在过去的十年中,结构的渐进式倒塌受到了越来越多的关注,而对构件重要性的研究是研究结构抗渐进式倒塌的关键步骤。然而,传统的构件重要性评估方法通常采用单一指标,当涉及多个指标时,不同的指标可能会产生不同的构件排序。此外,桁架串联结构是一个多构件的超静定结构,目前的研究主要集中在拉索失效上,这并不意味着其他构件不重要。本研究首先基于概念评价对重要构件进行初步筛选,然后采用交替路径法分析桁架串结构的渐进抗倒塌能力;引入增量动力分析曲线的斜率退化系数γ、承载力退化系数β和嵌套承载力退化系数β′;以轴力为结构响应定义灵敏度系数SIj和脆性系数VIi。根据上述五个指标,对两个案例进行了构件重要性评估。分析结果表明,拉索和支撑处的下弦杆被评为一级重要构件。通过对不同指标的分析发现,不同指标下各构件系数的规律性不一致。如果只用单一指标评价重要构件,结果可能会片面。此外,桁架串结构的二级重要构件是通过多指标分析进行评估的。最后,根据一级和二级重要构件的重要系数给出了桁架串结构的额定渐进式抗倒塌能力。
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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