Damage-based strength reduction factor for seismic design of structures subjected to offshore ground motions

IF 5.1 2区工程技术 Q1 ENGINEERING, CIVIL

Marine Structures Pub Date : 2025-09-23 DOI:10.1016/j.marstruc.2025.103945

Bali Liu , Hao Tian , Jinjun Hu , Changhai Zhai

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Abstract

This paper focuses on damage-based strength reduction factor (SRF) of single-degree-of freedom (SDOF) systems subjected to an ensemble of 892 offshore ground-motion records from the Kyoshin network in the Japan Sagami Bay Region. Damage-based SRF spectra are statistically developed considering both the offshore ground-motion characteristics (such as seafloor stations, magnitude, epicentral distance, significant duration and mean period) and structural parameters (including initial period, damage level, postyield stiffness ratio, ultimate ductility factor and hysteretic behavior). The differences in damage-based SRF spectra under offshore and onshore ground-motion records are also investigated. The results showed that the effects caused by offshore ground motions on the estimation of damage-based SRF are negligible, while the influence caused by the ultimate ductility factor can reach up to approximately 50 %. Analytical estimates of damage-based SRFs for mean level, 10th percentile values and 90th percentile values in terms of period, damage index, and ultimate ductility factor are proposed for the aseismic design of offshore structures.

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基于损伤的强度折减系数在近海地震动结构抗震设计中的应用

本文研究了日本相模湾地区京信网892条海上地面运动记录对单自由度系统损伤强度折减系数的影响。基于损伤的SRF谱在统计上考虑了海上地震动特征（如海底台站、震级、震中距离、显著持续时间和平均周期）和结构参数（包括初始周期、损伤水平、场后刚度比、极限延性系数和滞后行为）。研究了基于损伤的SRF谱在陆上和海上地震动记录下的差异。结果表明，海上地震动对基于损伤的SRF估计的影响可以忽略不计，而极限延性系数的影响可达50%左右。提出了基于损伤的srf均值、第10百分位值和第90百分位值的周期、损伤指数和极限延性系数的分析估计，用于海上结构抗震设计。

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来源期刊

Marine Structures 工程技术-工程：海洋

CiteScore

8.70

自引率

7.70%

发文量

157

审稿时长

6.4 months

期刊介绍： This journal aims to provide a medium for presentation and discussion of the latest developments in research, design, fabrication and in-service experience relating to marine structures, i.e., all structures of steel, concrete, light alloy or composite construction having an interface with the sea, including ships, fixed and mobile offshore platforms, submarine and submersibles, pipelines, subsea systems for shallow and deep ocean operations and coastal structures such as piers.