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首页> 外文期刊>Bulletin of earthquake engineering >Influence of steel mechanical properties on EBF seismic behaviour
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Influence of steel mechanical properties on EBF seismic behaviour

机译：钢材力学性能对EBF地震行为的影响

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Among the resisting systems suitable for the design of ductile steel structures, Eurocode 8 proposes MRFs and EBFs. The formers are considered more efficient in terms of ductility, but they suffer a strong weakness in the lateral stiffness, with following cumbersome design procedures to avoid excessive lateral displacements maintaining a quite high ductile behaviour under seismic actions. Often, the design process leads to not optimized structural members, oversized with respect to the minimum seismic requirements due to lateral deformation limitations. EBFs combine high lateral stiffness, due to bracing elements, and high dissipative capacities, provided by the plastic hinges developed in links. Eurocode 8 proposes a design procedure for EBF structures in which iterative checks are required to design links with a defined level resistance dependent on all the other links' strength. The present paper investigates the seismic behaviour of EBFs using Incremental Dynamic Analyses (IDA) to explore their mechanical response under increasing seismic action. IDAs are executed considering the influence of variability of steel mechanical properties on the behaviour of EBFs, using seven artificial accelerograms according to Eurocode 8. The aims of IDAs are the probabilistic assessment of the response of the system with respect to the variability of the material properties, the analysis of structural safety and the ability of the structures to internally redistribute plastic phenomena during the earthquake. Structural safety conditions will be defined according to a multi-level performance approach. The paper presents also some final suggestions for possible improvements and design simplifications.
机译：在适用于延性钢结构设计的抵抗系统中，欧洲规范8提出了MRF和EBF。前者在延性方面被认为是效率更高的，但是它们在横向刚度方面存在很大的弱点，需要遵循繁琐的设计程序来避免过度的横向位移，从而在地震作用下保持相当高的延性。通常，设计过程导致未优化的结构构件，由于横向变形限制，相对于最小地震要求而言，其尺寸过大。 EBF结合了高强度的横向刚度（由于支撑元件）和高耗散能力（由链节中开发的塑料铰链提供）。欧洲规范8提出了一种针对EBF结构的设计程序，在该程序中，需要进行迭代检查来设计具有定义的级别电阻（取决于所有其他链接的强度）的链接。本文使用增量动力分析（IDA）研究了EBF的抗震性能，以探讨其在增加地震作用下的机械响应。根据欧洲规范8，使用七个人工加速度图，考虑到钢的机械性能变化对EBF行为的影响，执行IDA。IDA的目的是根据系统对材料特性变化的响应进行概率评估。 ，分析了结构安全性以及结构在地震过程中内部重新分布塑性现象的能力。结构安全条件将根据多级性能方法进行定义。本文还提出了一些可能的改进和简化设计的最终建议。

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