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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Improved stochastic linearization technique for structures with nonlinear viscous dampers
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Improved stochastic linearization technique for structures with nonlinear viscous dampers

机译:非线性粘性阻尼器结构的改进随机线性化技术。

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摘要

The stochastic linearization technique (SLT), in its conventional force-based Gaussian version (FB-G-SLT), is widely adopted in the literature to handle the nonlinear power-law constitutive behavior of fluid viscous dampers (FVDs), either for evaluating the system response, or within optimal design strategies. In this note, the authors prove that, for the kind of nonlinearity induced by FVDs, this version of FB-G-SLT is not the best choice, especially if the velocity-related response is of major importance in an optimal design process. As an example, the energy dissipated by the devices depends upon the square of the velocity at the ends of the dampers. Among six different formulations of SLT examined in this note, an equal-energy non-Gaussian SLT (EE-NG-SLT) is found to be superior to the FB-G-SLT since it more satisfactorily captures the nonlinear response of the structure as predicted by Monte Carlo simulations. This alternative EE-NG-SLT, without requiring higher computational effort than the FB-G-SLT, is therefore recommended, especially when energy-based (or, in general, velocity-related) objective functions are used in the optimization problem of nonlinear viscous dampers.
机译:随机线性化技术(SLT),以其传统的基于力的高斯形式(FB-G-SLT),在文献中被广泛采用来处理流体粘性阻尼器(FVD)的非线性幂律本构行为,或者用于评估系统响应或最佳设计策略之内。在此注释中,作者证明,对于FVD引起的非线性而言,此版本的FB-G-SLT不是最佳选择,尤其是在最佳设计过程中与速度相关的响应至关重要的情况下。例如,设备消耗的能量取决于阻尼器端部速度的平方。在本说明中研究的SLT的六种不同配方中,发现等能量的非高斯SLT(EE-NG-SLT)优于FB-G-SLT,因为它可以更令人满意地捕获结构的非线性响应,如由蒙特卡洛模拟预测。因此,建议使用这种替代EE-NG-SLT,而不需要比FB-G-SLT更高的计算工作量,尤其是在非线性优化问题中使用基于能量(或通常与速度相关)的目标函数时尤其如此粘性阻尼器。

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