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Probabilistic updating of fishbone model for assessing seismic damage to beam-column connections in steel moment-resisting frames

机译:诸如钢时力框架梁柱连接抗震损伤的鱼骨模型的概率更新

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摘要

This article presents a probabilistic method of updating fishbone models for assessing seismic damage on beam-column connections in steel moment-resisting frames. Fishbone models enable explicitly identifying the rotational stiffness of beams, which is not possible with a shear building model commonly used in Bayesian model updating approaches. Necessary formulations to utilize fishbone models for model updating with measured floor accelerations under small-amplitude loadings including ambient excitations were first formulated. To accommodate the incompleteness of modal data to update unknown parameters of fishbone models, that is, the stiffness of rotational springs, a hierarchical Bayesian model updating algorithm is implemented. Seismic damage of beam-column connections are estimated by making a comparison of the identified rotational stiffness of springs in the fishbone models before and after earthquakes. The effectiveness of the proposed method is first examined with numerical simulations using a 10-story building model. Then, the applicability to realistic beam damage, that is, not artificially introduced, is evaluated through a full-scale steel frame test at the E-Defense shaking table facility. The article also discusses coefficients of variation of the identified stiffness and influence of modeling error on estimation of realistic damage to check the credibility of the method for real-life applications.
机译:本文介绍了更新鱼骨模型的概率方法,以评估钢力矩抵抗框架中梁柱连接的地震损伤。钓鱼型型号可明确识别光束的旋转刚度,这是不可能的贝叶斯模型更新方法中常用的剪切建筑模型。利用用于模型更新的鱼骨模型的必要制剂在包括环境激发的小幅度载荷下测量的地板加速度被制定。为了适应模态数据的不完整,以更新鱼骨模型的未知参数,即旋转弹簧的刚度,实现了旋转弹簧的刚度,实现了分层贝叶斯模型更新算法。通过在地震前后和之后的鱼骨模型中所识别的弹簧旋转刚度进行估计梁柱连接的地震损伤。首先使用10层建筑模型用数值模拟检查所提出的方法的有效性。然后,通过电子防御摇动台设施的全尺寸钢框架测试来评估对现实光束损坏的适用性,即不会人工引入。本文还讨论了所识别的刚度和模型误差对估计建模误差的影响的系数,以检查真实应用方法的可信度。

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