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Seismic design and test of gusset connections for buckling-restrained braced frames

机译：屈曲约束支撑框架的角撑板连接的抗震设计和测试

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摘要

The coiner gusset plates in a steel braced frame can be subjected to forces not only from the brace but also from the effects of the frame actions. In this study, several finite element models are constructed to analyze the gusset-to-beam and gusset-to-column interface forces. It is found that the frame actions affect the gusset interface force distributions significantly. A simplified strut model to represent the gusset plate is adopted to evaluate the frame action forces. In addition, the generalized uniform force method is adopted as it provides more freedom for designers to configure the gusset plate shapes than using the uniform force method. In this paper, a performance-based design method is proposed. The gusset interface force demands take into account the combined effect of the brace maximum axial force capacity and the peak beam shear possibly developed in the frame. The specimen design and key results of a series of full-scale three-story buckling-restrained braced frame (BRBF) hybrid tests are discussed. The gusset interface cracks observed at inter-story drift greater than 0.03 radians can be well predicted by using the proposed design method. The BRBF tests and analyses confirm that the proposed design method is reasonable. The effectiveness of varying the width of gusset edge suffeners in reducing the gusset tip stress concentrations is also investigated. This paper concludes with recommendations for the seismic design of BRBF corner gusset plates.
机译：钢制支撑框架中的角撑板角撑板不仅会受到支撑的作用，还会受到框架作用的作用。在这项研究中，建立了几个有限元模型来分析角撑板到梁和角撑板到柱的界面力。发现框架作用显着影响角撑板界面力分布。采用简化的撑杆模型来表示角撑板，以评估框架作用力。另外，采用了通用的均匀力法，因为与使用均匀力法相比，它为设计人员提供了设置角撑板形状的更大自由度。本文提出了一种基于性能的设计方法。角撑板界面力要求考虑了支架最大轴向力能力和框架中可能产生的峰值梁剪切力的综合作用。讨论了一系列全尺寸三层屈曲约束支撑框架（BRBF）混合试验的标本设计和关键结果。使用所提出的设计方法可以很好地预测在层间漂移大于0.03弧度时观察到的角撑板界面裂纹。 BRBF测试和分析证实了所提出的设计方法是合理的。还研究了改变扣板边缘增宽器的宽度在降低扣板尖端应力集中方面的有效性。本文对BRBF角撑板的抗震设计提出了建议。

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