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Re-shaping hysteretic behaviour—spectral analysis and design equations for semi-active structures

机译：重塑滞后特性-半主动结构的频谱分析和设计方程

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Semi-active dampers offer significant capability to reduce dynamic wind and seismic structural response. A novel resetable device with independent valve control laws that enables semi-active re-shaping of the overall structural hysteretic behaviour has been recently developed, and a one-fifth scale prototype experimentally validated. This research statistically analyses three methods of re-shaping structural hysteretic dynamics in a performance-based seismic design context. Displacement, structural force, and total base-shear response reduction factor spectra are obtained for suites of ground motions from the SAC project. Results indicate that the reduction factors are suite invariant. Resisting all motion adds damping in all four quadrants and showed 40-60% reductions in the structural force and displacement at the cost of a 20-60% increase in total base-shear. Resisting only motion away from equilibrium adds damping in quadrants 1 and 3, and provides reductions of 20-40%, with a 20-50% increase in total base-shear. However, only resisting motion towards equilibrium adds damping in quadrants 2 and 4 only, for which the structural responses and total base-shear are reduced 20-40%. The spectral analysis results are used to create empirical reduction factor equations suitable for use in performance based design methods, creating an avenue for designing these devices into structural applications. Overall, the reductions in both response and base-shear indicate the potential appeal of this semi-active hysteresis sculpting approach for seismic retrofit applications—largely due to the reduction of the structural force and overturning demands on the foundation system.
机译：半主动阻尼器具有显着的功能，可以减少动态风和地震结构的响应。最近开发了一种具有独立阀控制定律的新型可复位装置，该装置能够对整个结构的滞后行为进行半主动重塑，并通过实验验证了五分之一规模的原型。这项研究在基于性能的抗震设计环境中，统计分析了三种重塑结构滞后动力学的方法。从SAC项目获得了一系列地面运动的位移，结构力和总的基础剪力响应减小因子谱。结果表明，减少因子是套房不变的。抵抗所有运动会在所有四个象限中增加阻尼，并显示结构力和位移减小40-60％，而总基础剪切力却增加20-60％。仅阻止运动远离平衡状态会增加象限1和3的阻尼，并减少20-40％，总基本剪切力增加20-50％。但是，只有抵抗运动达到平衡，才在象限2和象限4中增加阻尼，为此，其结构响应和总基础剪力降低了20-40％。频谱分析结果用于创建适合在基于性能的设计方法中使用的经验折减系数方程式，从而为将这些器件设计为结构应用提供了途径。总体而言，响应和基础剪力的减少表明，这种半主动磁滞雕刻方法对于地震翻新应用具有潜在的吸引力-很大程度上是由于结构力的减小和对基础系统的倾覆要求。

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