Earthquake Response of Elastic Single-Degree-of-Freedom Systems with Nonlinear Viscoelastic Dampers
Earthquake Response of Elastic Single-Degree-of-Freedom Systems with Nonlinear Viscoelastic Dampers
复制标题
具有非线性粘弹性阻尼器的弹性单自由度系统的地震响应
DOI：
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发表时间：
2003
期刊：
影响因子：
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通讯作者：
A. Chopra
中科院分区：
文献类型：
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作者：
Wen;A. Chopra
研究了带有非线性粘弹性阻尼器（VED）的单自由度（SDF）体系的稳态受力和地震反应。VED是由非线性流体粘滞阻尼器（FVD）与线性弹性支撑单元（人字形或倒V形支撑）串联而成。对于广泛的支撑刚度，非线性阻尼器是有利的，因为它们可以实现基本相同的系统响应降低，但力显着降低。阻尼器的非线性有很小的影响，在速度敏感区域的频谱，即使支撑是相当灵活的结构响应，但差异高达16%，观察到在其他频谱区域。正如预期的那样，附加阻尼降低了结构响应，并且响应降低取决于支撑刚度，这种依赖性随谱区域而变化。在实际应用中，提出了一种直接从地震设计（或反应）谱估计结构变形、结构力、基础剪力和阻尼力的设计值的方法。最后，提出了一个程序，以确定阻尼器和支撑的性能，必要的限制结构变形的一些设计值或结构的能力。
Investigated are the steady-forced and earthquake responses of single-degree-of-freedom (SDF) systems with a nonlinear viscoelastic damper (VED), which consists of a nonlinear fluid viscous damper (FVD) connected in series to a linear elastic bracing element (chevron or inverted V-shaped braces). For a wide range of bracing stiffness, nonlinear dampers are advantageous because they achieve essentially the same reduction in system responses but with a significantly reduced force. Damper nonlinearity has little influence on the structural response in the velocity-sensitive region of the spectrum even if the bracing is fairly flexible, but differences up to 16% were observed in other spectral regions. As expected, supplemental damping reduces structural response and the response reduction depends on the bracing stiffness, with this dependence varying with the spectral regions. For practical applications, a procedure is presented to estimate the design values of structural deformation, structural force, foundation shear, and damper force directly from the earthquake design (or response) spectrum. Finally, a procedure is presented to determine the damper and bracing properties necessary to limit the structural deformation to some design value or to the structural capacity.