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Title |
Experimental Evaluation of Hysteretic Behavior and Equivalent Mechanical Properties of a Viscoelastic Damper under Different Shear Strains and Excitation Frequencies
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Authors |
김진우(Jinwoo Kim) ; 정인용(In-Yong Jung) ; 김영주(Young-Ju Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2026.30.4.176 |
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Keywords |
점탄성 댐퍼; 에너지 소산; 가진 주파수; 전단변형률; 이력거동; 등가감쇠; 등가 전단계수 Viscoelastic damper; Energy dissipation; Shear strain; Excitation frequency; Hysteretic behavior; Equivalent damping ratio; Equivalent shear modulus |
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Abstract |
This study experimentally investigates the hysteretic behavior and equivalent mechanical properties of a viscoelastic damper subjected to different shear strains and excitation frequencies. Cyclic loading tests were conducted by combining four shear-strain levels with four excitation frequencies, and the third loading cycle was selected to reduce initial-cycle effects and provide a consistent basis for comparison. The test results showed closed hysteresis loops under all loading conditions. As the shear strain increased, the maximum load and energy dissipation increased, whereas the equivalent stiffness and equivalent shear modulus decreased, indicating a pronounced strain-dependent reduction in equivalent stiffness. In contrast, the equivalent damping ratio remained within a relatively narrow range despite the large increase in dissipated energy. The influence of excitation frequency was comparatively limited, particularly at moderate-to-large shear strains, although some differences were observed at the lowest frequency in the small-strain range. Overall, the load resistance, stiffness, and energy dissipation characteristics were governed more strongly by shear strain than by excitation frequency. The results provide experimental data for developing design parameters for viscoelastic dampers.
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