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High-mode buckling responses of budding-restrained brace core plates

机译：萌芽约束支撑芯板的高模屈曲响应

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摘要

Cyclic loading tests and finite element analyses on six novel all-steel buckling-restrained braces (BRBs) are conducted using different loading patterns to investigate the core plate high-mode buckling phenomenon. The proposed BRB is composed of a core member and a pair of identical restraining members, which restrains the core member by using bolted shim spacers. The design of the proposed BRB allows the core plate to be visually inspected immediately following a major earthquake. If necessary, the pair of restraining members can be conveniently disassembled, and the damaged core plate can be replaced. Test results indicate that the proposed BRBs can sustain large cyclic strain reversals and cumulative plastic deformations in excess of 400 times the yield strain. Experimental and analytical results confirm that the high-mode buckling wavelength is related to the core plate thickness and the applied loading patterns. The larger the axial compressive strain is applied, the shorter the high-mode buckling wavelength would be developed. The buckling wavelength is about 12 times the core plate thickness when the high-mode buckling shape is fully developed. However, it reduces to about 10 times the core plate thickness when a compressive core strain reaches greater than 0.03. The high-mode bucking wavelength can be satisfactorily predicted using the proposed method or from the finite element analysis.
机译：利用不同的加载方式对六个新颖的全钢屈曲约束支撑（BRB）进行了循环载荷测试和有限元分析，以研究芯板高模屈曲现象。所提出的BRB由芯构件和一对相同的约束构件组成，该约束构件通过使用螺栓垫片垫片来约束芯构件。建议的BRB的设计允许在发生大地震后立即目视检查芯板。如果需要，可以方便地拆卸一对约束构件，并且可以更换损坏的芯板。测试结果表明，建议的BRB可以承受较大的循环应变反转，并且累积塑性变形超过屈服应变的400倍。实验和分析结果证实，高模屈曲波长与芯板厚度和所施加的载荷模式有关。施加的轴向压缩应变越大，形成的高模屈曲波长越短。当高模屈曲形状完全形成时，屈曲波长约为芯板厚度的12倍。但是，当压缩核心应变大于0.03时，它将减小到核心板厚度的10倍左右。使用提出的方法或从有限元分析中可以令人满意地预测高模补偿波长。

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