An efficient approach for optimum shape design of steel shear panel dampers under cyclic loading

IF 2.1 3区 工程技术 Q2 ENGINEERING, CIVIL
M. Khatibinia, Aghdas Ahrari, S. Gharehbaghi, S. R. Sarafrazi
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引用次数: 3

Abstract

The low-cycle fatigue performance of shear panel damper (SPD) highly depends on the geometry of its shape and the criterion considered for its design. The main contribution of the current study is to find the optimum shape of the SPD subjected to cyclic loading by considering two different objective functions. The maximum equivalent plastic strain and the ratio of energy dissipation through plastic deformation to the maximum equivalent plastic strain are selected as the first and second objective functions, respectively. Since the optimization procedure requires high computational efforts, a hybrid computational approach is used to perform two paramount phases of estimating the inelastic responses of the SPD and solving the optimization problem. In the first phase, as an alternative for the time-consuming finite element analysis of the SPD, a weighted-support vector machine model is developed to predict the inelastic responses of the SPDs during the optimization process. In the second phase, the optimum shape of the SPD is found by using the whale optimization algorithm (WOA). The results indicate that both design criteria lead to the optimum-shaped SPDs with a significant improvement in their low cycle fatigue performance in comparing with the initial rectangular shape while a slight reduction in their energy dissipation capacity. Moreover, the second design criterion is slightly better in the performance improvement of the optimum-shaped SPDs compared with the first one. In addition, the weighted-based SVM approach can accurately predict the inelastic responses of the SPDs under cyclic loading, and its combination with WOA results in finding the optimum solutions quickly.
循环荷载作用下钢板剪切板阻尼器形状优化设计的一种有效方法
剪力板阻尼器的低周疲劳性能在很大程度上取决于其几何形状和设计准则。本研究的主要贡献在于通过考虑两种不同的目标函数,找到SPD在循环荷载作用下的最佳形状。选择最大等效塑性应变和塑性变形耗散能量与最大等效塑性应变之比分别作为第一目标函数和第二目标函数。由于优化过程需要大量的计算量,因此采用混合计算方法来完成两个最重要的阶段:估计SPD的非弹性响应和求解优化问题。在第一阶段,为了替代耗时的SPD有限元分析,建立了一个加权支持向量机模型来预测SPD在优化过程中的非弹性响应。在第二阶段,利用鲸鱼优化算法(WOA)找到SPD的最佳形状。结果表明,两种设计准则均可使最优形状的spd在低周疲劳性能上较初始矩形形状有显著提高,而能量耗散能力略有降低。第二种设计准则对最优形状spd的性能提升略优于第一种设计准则。此外,基于加权支持向量机的方法可以准确预测spd在循环荷载下的非弹性响应,并与WOA相结合,可以快速找到最优解。
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来源期刊
Smart Structures and Systems
Smart Structures and Systems 工程技术-工程:机械
CiteScore
6.50
自引率
8.60%
发文量
0
审稿时长
9 months
期刊介绍: An International Journal of Mechatronics, Sensors, Monitoring, Control, Diagnosis, and Management airns at providing a major publication channel for researchers in the general area of smart structures and systems. Typical subjects considered by the journal include: Sensors/Actuators(Materials/devices/ informatics/networking) Structural Health Monitoring and Control Diagnosis/Prognosis Life Cycle Engineering(planning/design/ maintenance/renewal) and related areas.
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