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Seismic fragility assessment of large-scale pile-supported wharf structures considering soil-pile interaction

机译：考虑桩土相互作用的大型桩基码头结构抗震性评估

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摘要

Seismic fragility curves are recognized as a useful tool for seismic performance assessment of pile-supported wharf structure (PSWS) exposed to seismic hazards. These curves quantify the probability of structural vulnerability against given ground motion parameters. Soil-pile interaction (SPI) is found to have a significant impact on seismic performance of pile-supported structures. In this study, in order to better understand the SPI effect, the seismic fragility of a large-scale PSWS located at the Port of Los Angeles Berth 100, USA, is fully investigated with and without considering SPI. Herein, the pushover analysis scheme is used for inferring the bound limits of seismic demands of this large-scale PSWS. Specifically, the purpose of pushover analysis is twofold: to identify which pile of the PSWS most likely suffers from seismic failure; and to determine the bound limits of seismic demands for estimation of fragility curves using the identified pile. A collection of ground motions with low and high moment magnitudes as well as small and large fault distances are selected for nonlinear time history analysis. The seismic demand models can be readily estimated from the data set of the intensity measure-seismic demand pairs by classical regression fitting. A comparison of fragility curves with and without SPI shows that SPI significantly influences the seismic fragility of the PSWS. For distinct damage states, the effect of SPI on the seismic fragilities of different piles can be totally different.
机译：地震脆性曲线被认为是评估遭受地震危险的桩支撑码头结构（PSWS）的地震性能的有用工具。这些曲线量化了针对给定地面运动参数的结构脆弱性的可能性。发现土桩相互作用（SPI）对桩支撑结构的抗震性能有重大影响。在本研究中，为了更好地了解SPI的影响，在不考虑SPI的情况下，对位于美国洛杉矶泊位100港口的大型PSWS的地震脆性进行了充分的研究。在此，推覆分析方案用于推断该大型PSWS的地震需求的界限。具体地说，推覆分析的目的是双重的：确定最有可能遭受地震破坏的PSWS堆；并确定地震需求的界限，以便使用识别出的桩估算易碎性曲线。选择具有低和高弯矩量以及小和大的故障距离的地面运动的集合用于非线性时程分析。可以通过经典回归拟合轻松地从强度测度-地震需求对的数据集中估算地震需求模型。有和没有SPI的脆性曲线比较表明，SPI显着影响PSWS的地震脆性。对于不同的破坏状态，SPI对不同桩的地震脆弱性的影响可能完全不同。

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