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首页> 外文期刊>Earthquake Engineering & Structural Dynamics >Seismic performance analysis of BRBs and gussets in a full- scale 2-story BRB-RCF specimen
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Seismic performance analysis of BRBs and gussets in a full- scale 2-story BRB-RCF specimen

机译：2层全尺寸BRB-RCF标本中的BRB和角撑板的抗震性能分析

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The implementation of buckling-restrained braces (BRBs) for new reinforced concrete frame (RCF) constructions is limited. This study investigates the seismic forces and stability in the BRBs and gussets of a 2-story full-scale RCF specimen by using Abaqus models and a newly proposed stability evaluation method. The hybrid and cyclic loading test results are accurately predicted by the Abaqus analyses. Existing methods for computing the gusset interface forces for steel buildings from both the brace and the frame actions are compared with the Abaqus results. The applicability of these methods for the BRB-RCF design is critically evaluated. It is confirmed that the Parallel-2 method is suitable for estimating the BRB force demand imposed on the corner gusset and the generalized uniform force method is good for the corner gusset at the base. In addition, existing stability evaluation methods for BRBs and gussets are applied to investigate the out-of-plane (OOP) buckling of the first-story BRB observed at the end of tests. The proposed stability model incorporates the BRB restrainer's flexural effects and 4 rotational springs in assessing the BRB's buckling. This model confirms that the BRB and the gusset's OOP buckling limit states could be coupled and must be evaluated together. By incorporating the flexural effects of the steel casing and the infilled grout, the proposed model satisfactorily predicts the OOP buckling of the first-story BRB and gussets. These research results can be used for the implementation of BRBs in new RC frame constructions.
机译：对于新型钢筋混凝土框架（RCF）结构，屈曲约束支撑（BRB）的实施受到限制。本研究使用Abaqus模型和新提出的稳定性评估方法，研究了2层满刻度RCF标本的BRB和角撑板的地震力和稳定性。 Abaqus分析可​​准确预测混合和循环载荷测试结果。将现有的通过撑杆和框架作用来计算钢结构的角撑板界面力的方法与Abaqus结果进行了比较。严格评估了这些方法在BRB-RCF设计中的适用性。可以肯定的是，Parallel-2方法适用于估算施加在角形角撑板上的BRB力需求，而广义均匀力法适用于基部的角形角撑板。此外，将现有的BRB和角撑板稳定性评估方法应用于调查在测试结束时观察到的第一层BRB的平面外（OOP）屈曲。所提出的稳定性模型在评估BRB的屈曲时考虑了BRB约束器的挠曲效应和4个旋转弹簧。该模型证实，BRB和角撑板的OOP屈曲极限状态可以耦合，并且必须一起评估。通过结合钢套管和填充的灌浆的挠曲效应，所提出的模型可以令人满意地预测第一层BRB和角撑板的OOP屈曲。这些研究结果可用于在新的RC框架结构中实施BRB。

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