Testing Protocol for Short Links in Eccentrically Braced Frames
Testing Protocol for Short Links in Eccentrically Braced Frames
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DOI：
10.1061/(asce)0733-9445(2006)132:8(1183
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发表时间：
2006-08
期刊：
影响因子：
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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
偏心支撑框架 (EBF) 中连杆的非弹性旋转能力取决于测试加载历史或顺序。当前链接的设计轮换基于 20 世纪 80 年代使用稍微任意的加载协议进行的实验。 AISC 链路加载协议源自标准力矩框架加载协议，自 2002 年以来一直用于链路测试。该协议导致链路旋转能力较低。由于以前或当前的链路协议都不是基于 EBF 分析，因此进行了非线性时程分析来研究 EBF 中链路的累积旋转需求。结果表明 AISC 链路加载协议过于保守，累积轮换需求为 1.5 倍，大周期百分比也远高于合理水平。基于从时间历史分析中观察到的累积和最大链路旋转需求，开发了用于未来链路测试的合理加载协议。使用该新协议进行的并行研究中进行的实验测试表明，AISC 抗震规定中的连接设计旋转能力令人满意。
The inelastic rotation capacity of links in eccentrically braced frames (EBFs) is dependent on testing loading history or sequence. Current design rotations for links are based on experiments from the 1980s performed with somewhat arbitrary loading protocols. An AISC link loading protocol, derived from the standard moment frame loading protocol, has been used for link testing since 2002. This protocol results in lower link rotation capacities. Since no previous or current link protocols are based on EBF analyses, nonlinear time-history analyses were conducted to investigate cumulative rotation demands for links in EBFs. Results indicate the AISC link loading protocol is overly conservative, having 1.5 times the cumulative rotation demand and a much higher percentage of large cycles than is justifiable. A rational loading protocol for future link testing was developed based on cumulative and maximum link rotation demands observed from the time-history analyses. Experimental tests performed in a parallel study with this new protocol indicate that link design rotation capacities in the AISC Seismic Provisions are satisfactory.