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Median floor acceleration spectra of linear structures with uncertain properties

机译：性能不确定的线性结构的地面加速度中值谱

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摘要

Response parameters used to estimate nonstructural damage differ depending on whether deformation-sensitive or acceleration-sensitive components are considered. In the latter case, seismic demand is usually represented through floor spectra, that is response spectra in terms of pseudo-acceleration, which are calculated at the floor levels of the structure where the nonstructural components are attached to. Objective of this paper is to present a new spectrum-to-spectrum method for calculating floor acceleration spectra, which is able to explicitly account for epistemic uncertainties in the modal properties of the supporting structure. By using this method, effects on the spectra of possible variations from nominal values of the periods of vibration of the structure can be estimated. The method derives from the extension of closed-form equations recently proposed by the authors to predict uniform hazard floor acceleration spectra. These equations are built to rigorously account for the input ground motion uncertainty, that is the record-to-record variability of the nonstructural response. In order to evaluate the proposed method, comparisons with exact spectra obtained from a standard probabilistic seismic demand analysis, as well as spectra calculated using the Eurocode 8 equation, are finally shown. Copyright (c) 2017 John Wiley & Sons, Ltd.
机译：用于估计非结构性损伤的响应参数会有所不同，具体取决于是否考虑了变形敏感组件或加速度敏感组件。在后一种情况下，地震需求通常通过楼层频谱来表示，即以伪加速度表示的响应频谱，这些频谱是在非结构组件所附着的结构的楼层水平上计算的。本文的目的是提出一种用于计算地板加速度谱的新的谱到谱方法，该方法能够明确考虑支撑结构的模态特性中的认知不确定性。通过使用该方法，可以估计出结构振动周期的标称值可能变化对光谱的影响。该方法源自作者最近提出的用于预测均匀危险地面加速度谱的闭合形式方程的扩展。建立这些方程是为了严格考虑输入地面运动的不确定性，即非结构响应的记录间变化。为了评估所提出的方法，最后显示了与从标准概率地震需求分析中获得的精确光谱以及使用Eurocode 8方程计算的光谱的比较。版权所有（c）2017 John Wiley＆Sons，Ltd.

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