Effect of Flange Width-Thickness Ratio on Eccentrically Braced Frames Link Cyclic Rotation Capacity
Effect of Flange Width-Thickness Ratio on Eccentrically Braced Frames Link Cyclic Rotation Capacity
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DOI：
10.1061/(asce)0733-9445(2005)131:10(1546
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发表时间：
2005-10
期刊：
影响因子：
--
通讯作者：
P. Richards;C. Uang
中科院分区：
文献类型：
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作者：
P. Richards;C. Uang
对偏心支撑框架中法兰宽厚比对连杆转动能力的影响进行了分析研究。采用有限元模型对112条连杆的性能进行了研究，并对实验数据进行了验证。模型模拟了在循环加载过程中与法兰和腹板局部屈曲相关的强度退化。这些模型提供了短链、中间链和长链的数据，其中包括一系列的法兰宽度-厚度比。结果表明翼缘宽度有松弛。鞍钢现行抗震设计规定中的厚度比要求是合理的。然而，我们也发现，这些规定规定了一些中间环节的非保守设计旋转。结果表明，这与腹板加强筋间距有关，而与法兰宽厚比无关。
An analytical study was conducted to investigate the influence of the flange width–thickness ratio on the rotation capacity of links in eccentrically braced frames. Finite element models, verified using experimental data, were used to investigate the performance of 112 links. Models simulated strength degradation associated with flange and web local buckling that may occur during cyclic loading. The models provided data for short, intermediate, and long links with a range of flange width–thickness ratios. Results indicate that a relaxation of the flange width.thickness ratio requirement in current AISC seismic design provisions is justified. It was also found, however, that the provisions specify nonconservative design rotations for some intermediate links. This is shown to be related to web stiffener spacing and not the flange width–thickness ratio.