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首页> 外文期刊>Bulletin of earthquake engineering >An adjusted design approach for concentrically braced frames in low-to-moderate seismicity areas
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An adjusted design approach for concentrically braced frames in low-to-moderate seismicity areas

机译：低至中等地震性区域同心支撑框架的调整后的设计方法

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摘要

Steel concentrically braced frame (CBF) configuration is a common construction application in Europe. In the low-to-moderate seismicity context, European building codes provide two alternative design methods for CBFs; engineers have to choose between a "non-dissipative" method (DCL) neglecting all seismic provisions, and a "dissipative" one (DCM), applying its complex and expensive ductility requirements. Currently, the preferred method is the former one, because of its simplicity. Such a choice may lead on one side to oversized profiles that are unduly expensive, on the other side to possibly unsafe solutions due to the unpredictable nature of the regions characterized by low-to-moderate seismicity, where rare but strong earthquakes are foreseeable. On the other hand, enforcing engineers to apply strict "high-dissipative" rules seems too conservative for this case, which would result in over-safe, but uneconomic structures. This article proposes an adjusted design approach for the low-to-moderate seismicity design of CBF structures, aiming to satisfy both economy and safety criteria. The proposed approach is based on the exploitation of the three features of CBF systems, which have not been deeply investigated so far: "frame action provided by gusset plates", "contribution of compression diagonal and its post-buckling strength and stiffness", and "energy dissipation capacity of non-ductile bracing joint connections". The paper investigates these aspects by means of incremental dynamic analysis of case studies, based on the numerical models calibrated on full-scale experimental tests published elsewhere by the authors. As a result, it provides design recommendations and presents economic comparisons between the buildings designed with current Eurocode approach and the proposed one.
机译：钢制同心支撑框架（CBF）结构在欧洲是一种常见的建筑应用。在低至中等地震活动背景下，欧洲建筑规范为CBF提供了两种替代设计方法；工程师必须在忽略所有抗震规定的“非耗散”方法（DCL）和应用其复杂且昂贵的延性要求的“耗散”方法（DCM）之间进行选择。目前，首选的方法是前一种，因为它简单。这样的选择一方面可能会导致过于昂贵的超大剖面，另一方面可能会导致不安全的解决方案，因为低至中等地震活动的地区性质不可预测，在这些地区，罕见但强烈的地震是可以预见的。另一方面，强制工程师应用严格的“高耗散”规则对于这种情况来说似乎过于保守，这将导致过度安全但不经济的结构。本文提出了一种适用于CBF结构中低地震活动性设计的调整设计方法，旨在满足经济性和安全性标准。提出的方法基于对CBF系统三个特征的开发，这三个特征迄今尚未深入研究：“节点板提供的框架作用”、“压缩对角线及其屈曲后强度和刚度的贡献”，以及“非延性支撑接头连接的能量耗散能力”。本文通过案例研究的增量动态分析，基于作者在其他地方发表的全尺寸实验测试中校准的数值模型，对这些方面进行了研究。因此，本文提供了设计建议，并对采用现行欧洲规范方法设计的建筑与拟建建筑进行了经济比较。

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