Reliability-based optimal design of nonlinear viscous dampers for the seismic protection of structural systems
Reliability-based optimal design of nonlinear viscous dampers for the seismic protection of structural systems
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DOI：
10.1007/s10518-017-0233-4
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发表时间：
2018-02
影响因子：
4.6
通讯作者：
D. Altieri;E. Tubaldi;M. De Angelis;E. Patelli;A. Dall'asta
中科院分区：
文献类型：
--
作者：
D. Altieri;E. Tubaldi;M. De Angelis;E. Patelli;A. Dall'asta
粘性阻尼器被广泛用于提高结构体系的抗震性能，它们的设计通常使用简化的方法来考虑地震输入的不确定性。本文介绍了一种新颖而严谨的方法，该方法允许在设计基于性能准则的阻尼器的最佳粘性常数和速度指数时明确考虑地震输入强度和特征的可变性。最优解允许控制结构破坏的概率，同时最小化与减振器力总和相关的减振器成本。通过线性近似约束优化（COBYLA）方法有效地寻求优化问题的解，并在优化过程的每次迭代中采用子集模拟和辅助响应法进行性能评估。以一个3层的抗弯矩钢框架为例，说明了所提出的设计方法的应用，并评估和比较了不同阻尼器非线性水平下所能达到的性能。还与设计实践中经常采用的简化方法得到的结果进行了比较，这些方法旨在最小化粘性阻尼常数的总和和/或考虑单个危险级别进行性能评估。
Viscous dampers are widely employed for enhancing the seismic performance of structural systems, and their design is often carried out using simplified approaches to account for the uncertainty in the seismic input. This paper introduces a novel and rigorous approach that allows to explicitly consider the variability of the intensity and characteristics of the seismic input in designing the optimal viscous constant and velocity exponent of the dampers based on performance-based criteria. The optimal solution permits controlling the probability of structural failure, while minimizing the damper cost, related to the sum of the damper forces. The solution to the optimization problem is efficiently sought via the constrained optimization by linear approximation (COBYLA) method, while Subset simulation together with auxiliary response method are employed for the performance assessment at each iteration of the optimization process. A 3-storey steel moment-resisting building frame is considered to illustrate the application of the proposed design methodology and to evaluate and compare the performances that can be achieved with different damper nonlinearity levels. Comparisons are also made with the results obtained by applying simplifying approaches, often employed in design practice, as those aiming to minimize the sum of the viscous damping constant and/or considering a single hazard level for the performance assessment.