Optimization‐based seismic design of steel moment‐resisting frames with nonlinear viscous dampers
Optimization‐based seismic design of steel moment‐resisting frames with nonlinear viscous dampers
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基于优化的非线性粘滞阻尼钢抗弯框架抗震设计
DOI：
10.1002/stc.2655
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发表时间：
2020
影响因子：
5.4
通讯作者：
O. Lavan
中科院分区：
文献类型：
--
作者：
O. Idels;O. Lavan
提出了一种具有非线性流体粘性阻尼器（FVDs）的屈服抗矩框架（MRFs）抗震设计优化方法。针对新建建筑的优化设计，不预先设置参数，同时优化结构单元和阻尼器的性能。优化的目标是最小化系统（结构+阻尼器）的成本，同时考虑代码要求和性能约束。利用非线性时程分析（NTHA）来评估结构的性能，考虑到MRF单元和附加fvd的非线性行为。首先将优化问题表述为一个适合于用零阶优化方法求解的混合整数问题。然后，将问题重新表述为连续可微形式，并使用有效的基于梯度的优化方法进行求解。这是通过利用离散材料优化（DMO）函数来实现截面和fvd的良好初始设计来实现的。这种初步设计说明了设计的重要方面，有些是直接的，有些是间接的。在考虑地面运动集合的情况下，使用概率方法计算感兴趣的响应。数值算例表明了所提出方法的鲁棒性，并在一个五层和一个实际规模的不规则九层MRF上证明了其有效性。
An optimization approach for the seismic design of yielding moment‐resisting frames (MRFs) with nonlinear fluid viscous dampers (FVDs) is presented. As the optimal design of new buildings is addressed, no parameters are set a priori, and the properties of both the structural elements and the dampers are simultaneously optimized. The goal of the optimization is to minimize the cost of the system (structure + dampers), while code requirements and performance constraints are considered. The performance of the structure is evaluated using a nonlinear time history analysis (NTHA), accounting for the nonlinear behavior of both the MRF elements and the added FVDs. The optimization problem is first formulated as a mixed‐integer problem suitable for a solution by zero‐order optimization. Then, the problem is reformulated in a continuous differentiable form and solved using an efficient gradient‐based optimization approach. This is done by utilizing discrete material optimization (DMO) functions to achieve a good initial design for the cross‐sections and the FVDs. This initial design accounts for the important aspects of design, some directly and some indirectly. The responses of interest are computed using a probabilistic approach while considering ensembles of ground motions. Numerical examples show the robustness of the presented methodology and its efficiency demonstrated on a five‐story MRF and a real‐scale irregular nine‐story MRF.
影响因子：
4.6
作者：
D. Altieri;E. Tubaldi;M. De Angelis;E. Patelli;A. Dall'asta
通讯作者：
D. Altieri;E. Tubaldi;M. De Angelis;E. Patelli;A. Dall'asta