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Evaluation of predictors of non-linear seismic demands using 'fishbone' models of SMRF buildings

机译：使用SMRF建筑物的“鱼骨”模型评估非线性地震需求的预测因子

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Predictors (or estimates) of seismic structural demands that are less computationally time-consuming than non-linear dynamic analysis can be useful for structural performance assessment and for design. In this paper, we evaluate the bias and precision of predictors that make use of, at most, (ⅰ) elastic modal vibration properties of the given structure, (ⅱ) the results of a non-linear static pushover analysis of the structure, and (ⅲ) elastic and inelastic single-degree-of-freedom time-history analyses for the specified ground motion record. The main predictor of interest is an extension of first-mode elastic spectral acceleration that additionally takes into account both the second-mode contribution to (elastic) structural response and the effects of inelasticity. This predictor is evaluated with respect to non-linear dynamic analysis results for 'fishbone' models of steel moment-resisting frame (SMRF) buildings. The relatively small number of degrees of freedom for each fishbone model allows us to consider several short-to-long period buildings and numerous near- and far-field earthquake ground motions of interest in both Japan and the U.S. Before doing so, though, we verify that estimates of the bias and precision of the predictor obtained using fishbone models are effectively equivalent to those based on typical 'full-frame' models of the same buildings.
机译：与非线性动力分析相比，计算上耗时少的地震结构需求的预测器（或估计值）对于结构性能评估和设计很有用。在本文中，我们评估了预测器的偏差和精度，这些预测器最多使用以下各项：（ⅰ）给定结构的弹性模态振动特性，（ⅱ）该结构的非线性静态推覆分析的结果，以及（ⅲ）针对指定地面运动记录的弹性和非弹性单自由度时程分析。感兴趣的主要预测因素是第一模式弹性频谱加速度的扩展，该扩展还同时考虑了第二模式对（弹性）结构响应的影响以及非弹性的影响。针对钢制抗弯框架（SMRF）建筑的“鱼骨”模型的非线性动态分析结果评估了该预测变量。每个鱼骨模型的自由度都相对较少，因此我们可以考虑日本和美国都感兴趣的几座短期到长期建筑物以及许多近场和远场地震地震动。但是，在这样做之前，我们验证使用鱼骨模型获得的预测变量的偏差和精度的估计有效地等同于基于相同建筑物的典型“全帧”模型的估计。

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