When subjected to excessive shear deformation, viscoelastic (VE) dampers may inevitably suffer from damages, due to their VE material layers with limited thickness. Under the circumstance, their stiffness and energy dissipation capabilities may deteriorate but not totally vanish. To estimate the seismic performances of viscoelastically damped structures, the beyond design and residual performances of damaged VE dampers are crucial to protect structures from severe failure during the following main shock or aftershocks. On the other hand, for new viscoelastically damped structures under the normal design earthquakes, neglecting the residual performance of damaged VE dampers may result in nonconservative design. Thus, this study aims to provide approaches to analytically characterize the beyond design and residual performances of damaged full-scale VE dampers. Based on the simplified fractional derivative model, the analytical predictions have been compared with the experimental results. The proposed model works well for the design performance of the intact full-scale VE dampers. Particularly, it can also reproduce the beyond design and residual performances of damaged full-scale VE dampers, if due consideration is taken of the effects of excitation frequencies, ambient temperatures, temperature rises, softening, and hardening.

中文翻译：

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用简化分数导数模型预测粘弹性阻尼器的超越设计和剩余性能

当受到过度剪切变形时，粘弹性 (VE) 阻尼器可能不可避免地遭受损坏，因为它们的 VE 材料层厚度有限。在这种情况下，它们的刚度和能量耗散能力可能会下降，但不会完全消失。为了估计粘弹性阻尼结构的抗震性能，损坏的 VE 阻尼器的超设计和剩余性能对于保护结构在随后的主震或余震中免受严重破坏至关重要。另一方面，对于正常设计地震下的新型粘弹性阻尼结构，忽略损坏的 VE 阻尼器的剩余性能可能会导致设计不保守。因此，本研究旨在提供方法来分析表征损坏的全尺寸 VE 阻尼器的超出设计和剩余性能。基于简化的分数导数模型，将解析预测与实验结果进行了比较。所提出的模型适用于完整的全尺寸 VE 阻尼器的设计性能。特别是，如果适当考虑激励频率、环境温度、温升、软化和硬化的影响，它还可以再现损坏的全尺寸 VE 阻尼器的超出设计和剩余性能。