Abstract The stability and integrity of structures under indeterminant external loadings, particularly earthquakes, is a vital issue for the design and safe operation of marine and offshore structures. Over the past decades, many structural control systems, such as viscous-based systems, have been developed and embedded in marine and offshore structures, particularly oil platforms to maintain the stability and mitigate the seismic hazards. Rapid improvement in intelligent materials, including shape memory alloys (SMAs) and Magnetorheological fluid (MRF), have led to the design and development of efficient structural control elements. The present work aims to establish a framework for the structural control element in which the controllability of magnetorheological fluid and superelasticity effect of shape memory alloy have been combined to generate a new structural control element with an ability to dissipate a significant amount of energy while controlling the inter-element displacement in marine structures. The dynamic responses of a simplified 2DOF structure equipped with structural control elements have been conducted using the Open System for Earthquake Engineering Simulation (OpenSees). A comparison between the present SMA-MRF-based and the viscous-based systems has been performed. It is seen that the activated SMA-MRF-based control system in a wide range of the loading frequency spectrum decreases the maximum inter-story displacements of the frame as well as drift ratios. A comparison between the most common stability control element and the present system for seismic conditions has been conducted.

中文翻译：

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用于海洋结构地震控制的半主动 SMA-MRF 结构稳定元件

摘要 在不确定的外部载荷，特别是地震作用下，结构的稳定性和完整性是海洋和近海结构设计和安全运行的重要问题。在过去的几十年中，已经开发了许多结构控制系统，例如基于粘性的系统，并将其嵌入海洋和海上结构，特别是石油平台，以保持稳定性并减轻地震危害。包括形状记忆合金 (SMA) 和磁流变液 (MRF) 在内的智能材料的快速改进已经导致了高效结构控制元件的设计和开发。目前的工作旨在建立一个结构控制元件的框架，其中磁流变流体的可控性和形状记忆合金的超弹性效应相结合，以产生一种新的结构控制元件，该结构控制元件具有耗散大量能量的能力，同时控制海洋结构中的元素间位移。已使用开放式地震工程模拟系统 (OpenSees) 进行了配备结构控制元件的简化 2DOF 结构的动态响应。已经对当前基于 SMA-MRF 的系统和基于粘性的系统进行了比较。可以看出，在很宽的加载频谱范围内激活的基于 SMA-MRF 的控制系统降低了框架的最大层间位移以及漂移率。已经对最常见的稳定性控制元件和当前的地震条件系统进行了比较。