This paper aims to achieve minimum life‐cycle cost, by applying a seismic design optimization of the steel frames with semiactive magnetorheological (MR) dampers. The total life‐cycle cost, which includes the initial constructional and expected damage costs, is an adequate goal to satisfy both employer and users. For optimal performance of the dampers, two fuzzy control systems are suggested, each having two different inputs. Results of numerical analysis for an 11‐story steel structure show that using MR dampers decreases the interstory drift ratios to a permissible limit. It also reduces life‐cycle cost when the design is optimum and when the dampers are evenly distributed by 23% and 14%, respectively. In the case where the objective function was to minimize the total life‐cycle cost, the expected injury and fatality, as the most crucial financial parameters, had the highest decrease rate. There was also a 17% drop in comparison to the state that the dampers are evenly distributed. The fuzzy control with drift and velocity as inputs had better performance in minimizing the total life‐cycle cost than the other fuzzy control, which used acceleration instead of velocity.

中文翻译：

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用于钢框架抗震控制的半主动磁流变阻尼器的生命周期成本优化

本文旨在通过对具有半主动磁流变（MR）阻尼器的钢框架进行抗震设计优化来实现最低的生命周期成本。总的生命周期成本，包括初始的建设成本和预期的损害成本，是满足雇主和用户的适当目标。为了使阻尼器达到最佳性能，建议使用两个模糊控制系统，每个系统具有两个不同的输入。对一个11层钢结构的数值分析结果表明，使用MR阻尼器可使层间漂移率降低到允许的极限。当设计最佳时，当阻尼器平均分配分别为23％和14％时，它还降低了生命周期成本。如果目标功能是最大程度地减少生命周期总成本，预期的伤害和死亡，作为最关键的财务参数，下降率最高。与阻尼器均匀分布的状态相比，下降了17％。与其他以加速度代替速度的模糊控制相比，以漂移和速度为输入的模糊控制在最小化总生命周期成本方面具有更好的性能。