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Nonsymmetrical loading protocols for shear links in eccentrically braced frames

机译：偏心支撑框架中剪力连接的非对称加载方案

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摘要

The AISC Seismic Provisions for Structural Steel Buildings (AISC 341-16) provide a testing protocol for qualification of link-to-column connections in eccentrically braced frames (EBFs). This symmetrical testing protocol was developed by conducting nonlinear time history analysis on representative EBFs designed according to the International Building Code. Although the testing protocol is intended for qualification of link-to-column connections, many research programs have employed this recommended protocol for testing of shear links. Recent numerical investigations on constructed EBFs and archetype models showed that links can be subjected to one-sided loadings with significantly higher link rotation angles than the codified limits. A numerical study has been undertaken to develop nonsymmetrical loading protocols for shear links in EBFs. Pursuant to this goal, 20 EBF archetypes were designed according to the ASCE7-16 standard. The main parameters investigated were the link length to bay width ratio (e/L), number of stories, type of EBF, and the ground motion level. The archetypes were subjected to maximum considered earthquake and collapse level earthquake as recommended by FEMA P695. The results showed that the history of link rotation is single sided and depends strongly on e/L and the level of ground motion. Nonsymmetrical loading protocols that depend on the aforementioned variables were developed and are presented herein.
机译：AISC钢结构房屋抗震规定（AISC 341-16）提供了用于验证偏心支撑框架（EBF）中的链柱连接的测试协议。该对称测试协议是通过对根据国际建筑规范设计的代表性EBF进行非线性时程分析而开发的。尽管该测试协议旨在验证链接到列的连接，但许多研究程序已将此推荐协议用于剪切链接的测试。最近对构造的EBF和原型模型的数值研究表明，链节可以承受单向载荷，而链节的旋转角度要比编码极限高得多。已经进行了数值研究以开发用于EBF中的剪切链接的非对称加载协议。为此，根据ASCE7-16标准设计了20种EBF原型。研究的主要参数是链节长度与海湾宽度之比（e / L），层数，EBF的类型和地面运动水平。根据FEMA P695的建议，原型受到了最大考虑的地震和坍落度地震。结果表明，链节旋转的历史是单面的，并且在很大程度上取决于e / L和地面运动的水平。制定并提出了依赖于上述变量的非对称加载协议。

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