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Determination of optimal probabilistic seismic demand models for pile-supported wharves

机译：桩基码头最优概率地震需求模型的确定

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One of the basic components of the Performance-Based Earthquake Engineering (PBEE) framework of Pacific Earthquake Engineering Research (PEER) Center is the probabilistic seismic demand model (PSDM). PSDM is based upon a representative relation between ground motion intensity measures (IMs) and engineering demand parameters (EDPs). This research aims to develop an optimal PSDM for typical pile-supported wharf structures in western US ports by using probabilistic seismic demand analysis (PSDA). In this study, 4 bins with 20 non-near-field ground motions and 7 typical pile-supported wharf structures are used to determine an optimal PSDM by PSDA. The model geometry used in this study has a hybrid configuration incorporating many common field conditions. The optimal PSDM should be practical, sufficient, effective and efficient - all tested through several IM-EDP pairs derived by PSDA. The ground motion IMs used in this study include characteristics such as spectral quantities, duration, energy-related quantities and frequency content. Different EDPs are considered for local, intermediate and global response quantities. The considered optimal PSDM comprises a spectral IM, such as spectral acceleration and one of several EDPs. The EDPs of moment curvature ductility factor, displacement ductility factor and horizontal displacement of embankment and differential settlement between deck and behind land are considered for local, intermediate and global response quantities, respectively. Optimal PSDMs are used within PEER-PBEE framework, where they are coupled with both ground motion intensity and structural element fragility models to yield probabilities of exceeding structural performance levels under certain seismic hazard.
机译：太平洋地震工程研究（PEER）中心基于性能的地震工程（PBEE）框架的基本组成部分之一是概率地震需求模型（PSDM）。 PSDM基于地面运动强度度量（IM）与工程需求参数（EDP）之间的代表性关系。本研究旨在通过概率地震需求分析（PSDA）为美国西部港口典型的桩支撑码头结构开发一种最佳PSDM。在这项研究中，使用具有20个非近场地面运动的4个料箱和7个典型的桩支撑码头结构来确定PSDA的最佳PSDM。本研究中使用的模型几何结构具有混合配置，其中包含许多常见的现场条件。最佳PSDM应该是实用，足够，有效和高效的-所有这些都通过PSDA导出的几个IM-EDP对进行了测试。本研究中使用的地面运动IM包括频谱量，持续时间，与能量有关的量和频率含量等特性。对于本地，中间和全局响应量，考虑使用不同的EDP。被认为是最佳的PSDM包括频谱IM（例如频谱加速度）和几个EDP之一。分别考虑了局部，中间和整体响应量，分别考虑了弯矩延性因子，位移延性因子和路堤水平位移以及甲板与后陆之间差异沉降的EDP。最佳PSDM在PEER-PBEE框架内使用，在这些框架中，它们与地震动强度和结构单元易损性模型结合使用，在某些地震危险下产生超过结构性能水平的概率。

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