Abstract Owing to a high plastic deformation capacity, low-yield-strength steel (LYS) shear panel dampers have been widely used in structural seismic engineering. Meanwhile, there is still no effective method to evaluate the shear buckling capacity of LYS shear panel dampers under plastic deformation. Thin-walled cylinders approximated as shear panels are adopted to experimentally analyse the plastic buckling. The effects of the shape aspect ratio and the width-to-thickness ratio on the deformation capacity are discussed. The buckling behaviour is directly judged and analysed by measuring the out-of-plane deformation of the specimens. By analysing different plastic modulus during buckling, it is found that the critical plastic buckling stress can only be predicted accurately when the variable deformation theory incorporated with the stable plastic deformation is adopted. The critical buckling strain of the LYS can be evaluated by the width-to-thickness ratio solely. This study will be of significant value in the analysis of the buckling capacity of LYS in the plastic-deformation range.

中文翻译：

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考虑塑性变形的低屈服强度钢剪切屈曲能力的准确预测

摘要 低屈服强度钢（LYS）剪切板阻尼器由于具有较高的塑性变形能力，在结构抗震工程中得到了广泛的应用。同时，目前还没有有效的方法来评估LYS剪切板阻尼器在塑性变形下的剪切屈曲能力。采用近似为剪切板的薄壁圆柱体对塑料屈曲进行实验分析。讨论了形状纵横比和宽厚比对变形能力的影响。屈曲行为是通过测量试样的平面外变形来直接判断和分析的。通过分析屈曲过程中不同的塑性模量，研究发现，只有采用结合稳定塑性变形的变变形理论，才能准确预测临界塑性屈曲应力。LYS 的临界屈曲应变可以仅通过宽厚比来评估。本研究对分析 LYS 在塑性变形范围内的屈曲能力具有重要价值。