黏弹性阻尼器的剪-扭耦合性能足尺试验研究
Full-Scale Experimental Study on Shear-Torsion Coupled Performance of Viscoelastic Dampers
理论中的黏弹性阻尼器以黏弹性材料的纯剪切变形来耗散能量,而实际工程中,黏弹性阻尼器通常处于剪力、轴力、弯矩及其组合下的复杂受力状态。黏弹性阻尼器的实际工作状态比理论的工作状态更复杂,这对结构的刚度和耗能有较大的影响。基于此,将黏弹性阻尼器的复杂受力状态下的变形分解为平动和转动剪切变形,提出剪-扭耦合的力学模型。通过足尺性能试验,研究了剪-扭耦合下黏弹性阻尼器特有的力学参数。试验结果表明,剪-扭耦合的试验结果与数值分析及力学模型匹配较好,试验结果验证了剪-扭耦合力学模型的正确性。同时,提出的扭矩修正系数的试验值与理论值偏差小于5%,表明扭矩修正系数的试验值与理论值基本一致。在变形和频率相关性试验中,验证了本试验中剪切与扭转变形相对恒定的关系。
In theory, viscoelastic dampers (VEDs) dissipate energy through shear deformation of viscoelastic materials, while in practical engineering, VEDs are usually in complex stress states under shear force, axial force, bending moment, and their combinations. So, the actual stress state of VEDs is more complex than the theoretical stress state, which has a significant impact on the stiffness and energy dissipation of the structure. Based on this, the deformation of VEDs under complex stress states is decomposed into translational shear deformation and rotational shear deformation, and a shear-torsion coupled mechanical model is proposed. Through full-scale performance tests, the unique mechanical parameters of VEDs under shear-torsion coupled are studied. The test results show that the shear-torsion coupled test results match well with numerical analysis and mechanical models, and the test results verify the shear-torsion coupled mechanical model. Furthermore, the differences between the experimental and theoretical values of the proposed torque correction coefficient are less than 5%, indicating that the experimental and theoretical values of the torque correction coefficient are basically consistent. In the deformation and frequency correlation tests, the relatively constant relationship between shear and torsional deformation in the test is verified.
黏弹性阻尼器 / 复杂受力状态 / 剪-扭耦合性能 / 足尺试验
viscoelastic damper / complex stress state / shear-torsion coupled performance / full-scale test
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国家自然科学基金国家杰出青年科学基金项目(52025083)
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