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Selection of optimal intensity measures in probabilistic seismic demand models of highway bridge portfolios

机译：公路桥梁组合概率地震需求模型中最佳强度测度的选择

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摘要

Probabilistic seismic demand models are a common and often essential step in generating analytical fragility curves for highway bridges. With these probabilistic models being traditionally conditioned on a single seismic intensity measure (IM), the degree of uncertainty in the models is dependent on the IM used. Selection of an optimal IM for conditioning these demand models is not a trivial matter and has been the focus of numerous studies. Unlike previous studies that consider a single structure for IM selection, this study evaluates optimal IMs for use when generating probabilistic seismic demand models for bridge portfolios such as would be found in HAZUS-MH. Selection criteria such as efficiency, practicality, sufficiency, and hazard computability are considered in the selection process. A case study is performed considering the multi-span simply supported steel girder bridge class. Probabilistic seismic demand models are generated considering variability in the geometric configurations and material properties, using two suites of ground motions-one synthetic and one recorded motion suite. Results show that of the 10 IMs considered, peak ground acceleration (PGA) and spectral acceleration at the fundamental period are the most optimal for the synthetic motions, and that cumulative absolute velocity is also a close contender when using recorded motions. However, when hazard computability is considered, PGA is selected as the IM of choice. Previous studies have shown that spectrally based quantities perform better than PGA for a given structure, but the findings of this study indicate that when a portfolio of bridges is considered, PGA should be used.
机译：概率地震需求模型是生成公路桥梁分析性脆性曲线的常见步骤，通常是必不可少的步骤。由于这些概率模型通常以单个地震强度测度（IM）为条件，因此模型中的不确定性程度取决于所使用的IM。选择最佳的IM来调节这些需求模型并不是一件容易的事，并且已经成为众多研究的重点。与以前的研究仅考虑IM的单一结构的研究不同，本研究评估在生成桥梁组合的概率地震需求模型（例如在HAZUS-MH中发现）时使用的最佳IM。在选择过程中会考虑选择标准，例如效率，实用性，充分性和危害可计算性。考虑多跨简支钢梁桥类别的案例研究。考虑到几何构型和材料属性的变化性，使用两个地面运动套件（一个合成运动和一个记录的运动套件）生成概率地震需求模型。结果表明，在所考虑的10个IM中，基本周期的峰值地面加速度（PGA）和频谱加速度对于合成运动是最佳的，并且在使用记录的运动时累积绝对速度也是最有力的竞争者。但是，考虑到危害可计算性时，将PGA选择为IM。先前的研究表明，对于给定的结构，基于光谱的数量比PGA更好，但是这项研究的结果表明，当考虑桥梁组合时，应使用PGA。

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