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首页> 外文会议>Structural Engineers Association of California(SEAOC) Convention; 20040825-28; Monterey,CA(US) >Impact of Recent Research Findings on Eccentrically Braced Frame (EBF) Design
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Impact of Recent Research Findings on Eccentrically Braced Frame (EBF) Design

机译：最新研究结果对偏心支撑框架（EBF）设计的影响

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摘要

EBF design provisions, including allowable link rotations, in the AISC Seismic Provisions are based on results from A36 links tested at the University of California, Berkeley (UCB) in the 1980's. To address new issues related to the use of A992 steel in modern EBFs, new experimental testing and finite element modeling of EBF links were performed. Twenty three link specimens were tested at the University of Texas at Austin (UTA). One objective of the UTA experimental data was used to validate finite element models developed at the University of California, San Diego (UCSD) that simulate link behavior under cyclic loading. A parametric study was conducted at UCSD with finite element model links providing continuous data for short, intermediate, and long links with varying section geometry. This paper highlights findings from these experimental and analytical investigations. The impact of flange width-thickness ratio, intermediate stiffener spacing, and experimental loading protocol on link rotation capacity and failure mode are discussed. Expected overstrength of A992 links is also covered. Results indicate that the flange width-thickness requirement for short links can be safely relaxed to the compactness limit (b_f/2t_f ＜ 0.38 (E_s/F_y)~(1/2) ), which will permit more economical design of EBFs. Recommendations are given for intermediate stiffener detailing that will improve link rotation capacity.
机译：AISC地震规定中的EBF设计规定（包括允许的连杆旋转）基于1980年代在加利福尼亚大学伯克利分校（UCB）测试的A36连杆的结果。为了解决与现代EBF中使用A992钢有关的新问题，对EBF连杆进行了新的实验测试和有限元建模。在德克萨斯大学奥斯汀分校（UTA）测试了23个链接标本。 UTA实验数据的一个目标用于验证由加利福尼亚大学圣地亚哥分校（UCSD）开发的有限元模型，该模型可模拟循环载荷下的链接行为。在UCSD进行了参数研究，使用有限元模型链接提供了具有变化截面几何形状的短，中和长链接的连续数据。本文重点介绍了这些实验和分析研究的发现。讨论了法兰宽厚比，中间加劲肋间距和实验载荷方案对链节旋转能力和破坏模式的影响。还涵盖了A992链接的预期超强度。结果表明，可以将短链节的法兰宽度-厚度要求放宽到密实度极限（b_f / 2t_f ＜0.38（E_s / F_y）〜（1/2）），这将使EBF的设计更为经济。给出了建议的中间加强筋细节，以提高链节的旋转能力。

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