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首页> 外文期刊>Soil Dynamics and Earthquake Engineering >Damage-based optimal design of friction dampers in multistory chevron braced steel frames
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Damage-based optimal design of friction dampers in multistory chevron braced steel frames

机译：多层人字形支撑钢框架中基于阻尼的基于损伤的优化设计

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摘要

In this paper, a probability-based design methodology of the friction dampers in multi-story steel frames is proposed. Both the slip force of the device and the stiffness ratio of the system are analyzed as two important parameters, which affect the behavior of the structures equipped with friction devices. The seismic fragility of friction damped braced frames is evaluated and used to identify the optimal ranges of the above-mentioned design parameters so as to minimize the overall damage probability of the structure under the action of strong ground motions. For this purpose, fragility functions of the structural models are derived using nonlinear incremental dynamic analyses. To demonstrate the efficiency of the proposed method, three structural models of steel moment resisting frames with friction damper systems (including chevron braces and damper devices) are considered for the purpose of the seismic performance analysis. The results of the analyses show that the largest damage probability in each structural model corresponds to the case with the higher slip force and the lower stiffness ratio, where the undesirable buckling failure will govern before full activation of friction damper. For the three considered building frames, the optimal range of slip force lies between 40% and 55% of the total weight of structures and the recommended value for stiffness ratio is 2.
机译：本文提出了一种基于概率的多层钢框架减振器设计方法。装置的滑动力和系统的刚度比均作为两个重要参数进行分析，这两个参数会影响装有摩擦装置的结构的性能。对摩擦阻尼支撑框架的地震脆性进行了评估，并用于确定上述设计参数的最佳范围，从而最大程度地降低了结构在强地面运动作用下的整体破坏概率。为此，使用非线性增量动力分析来推导结构模型的脆弱性函数。为了证明所提方法的有效性，考虑了具有减震系统的钢制抗弯框架的三种结构模型（包括人字形支撑和减震装置），以进行抗震性能分析。分析结果表明，在每个结构模型中，最大的损坏概率与较高的滑移力和较低的刚度比相对应，其中不希望的屈曲破坏将在摩擦阻尼器完全激活之前发生。对于三个已考虑的建筑框架，最佳的滑动力范围在结构总重量的40％至55％之间，建议的刚度比值为2。

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