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Seismic protection of smart base-isolated structures using negative stiffness device and regulated damping

SMART STRUCTURES AND SYSTEMS 2018年第3期21卷 359-371页

作者： Bahar, Arash Salavati-Khoshghalb, Mohsen Ejabati, Seyed Mehdi Univ Guilan Fac Engn Dept Civil Engn Rasht Iran

Strong seismic events commonly cause large drift and deformation, and functionality failures in the superstructures. One way to prevent functionality failures is to design structures which are ductile and flexible through yielding when subjected to strong ground excitations. By developing forces that assist motion as "negative stiffness forces", yielding can be achieved. In this paper, we adopt the weakening and damping method to achieve a new approach to reduce all of the structural responses by further adjusting damping phase. A semi-active control system is adopted to perform the experiments. In this adaptation, negative stiffness forces through certain devices are used in weakening phase to reduce structural strength. Magneto-rheological (MR) dampers are then added to preserve stability of the structure. To adjust the voltage in MR dampers, an inverse model is employed in the control system to command MR dampers and generate the desired control forces, where a velocity control algorithm produces initial required control force. An extensive numerical study is conducted to evaluate proposed methodology by using the smart base-isolated benchmark building. Totally, nine control systems are examined to study proposed strategy. Based on the numerical results of seven earthquakes, the use of proposed strategy not only reduces base displacements, base accelerations and base shear but also leads to reduction of accelerations and inter story drifts of the superstructure. Numerical results shows that the usage of inverse model produces the desired regulated damping, thus improving the stability of the structure.

关键词： weakening and damping negative stiffness device MR damper inverse model velocity control algorithm smart base-isolated

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An adapted weakening and high damping approach for seismic protection of structures

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EARTHQUAKES AND STRUCTURES 2021年第5期20卷 543-556页

作者： Bahar, Arash Salavati-Khoshghalb, Mohsen Ejabati, Seyed Mehdi Univ Guilan Fac Engn Dept Civil Engn Rasht Iran Babol Noshirvani Univ Technol Dept Civil Engn Babol Iran

Seismic isolation is widely used in the structures to dissipate the destructive energy of an earthquake by decoupling the superstructure from the ground. High-damping rubber (HDR) devices, as a type of energy dissipating device, used in structural systems to control the structural response under energetic excitations such as earthquakes. This paper uses the Weakening and Damping (WeD) scheme to realize a modified approach in reducing all of the structural responses simultaneously. By this modification, Negative Stiffness Devices (NSDs) are used for the weakening phase to lessen lateral strength. The HDR device is used as a part of NSDs components. HDR generates a high damping force to establish a modified "Weakening and High Damping" (WeHD) concept and gain optimal performance in the overall structural responses. Use of the HDR in seismic base isolation not only prevents permanent deformation under strong motions but also works as an energy dissipating device even during the small ambient vibrations. Since the structure could be unstable by using NSDs, MR dampers are added to preserve stability. An inverse model is employed to command MR dampers by adjusting the voltage and generating the desired control forces. To further verify the proposed WeHD device, a smart base-isolated benchmark building framework is used. Based on the results, the proposed Weakening and High Damping (WeHD) approach not only reduces base displacements, accelerations, and shear but also leads to a reduction in the accelerations and inter-story drifts of the superstructure.

关键词： high damping rubber weakening and damping negative stiffness device inverse model velocity control algorithm smart base-isolated

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EXPERIMENTAL STUDY OF THE DYNAMIC BEHAVIOUR OF HIGH DAMPING RUBBER BEARING ISOLATOR

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12th International Symposium on Structural Engineering (ISSE-12)

作者： Zhang, Zhenxue Yuan, Yong Zhu, Hongping Wei, Wei Hebei Univ Technol Tianjin Peoples R China Huazhong Univ Sci & Technol Dept Civil Engn & Mech Wuhan Peoples R China

ISBN: (纸本)9787030357878

High-damping rubber bearing isolator (HDR) has become as an effective device to enhance the seismic resistance for ridge, the lead rubber isolators (LRB) as well. However, the dynamic characteristics of the HDR isolators have not always been clarified so far because of their scatter nature of mechanical properties and the lack of reliable test data. In this study, new type of HDR isolator is tested dynamically under different conditions. Using the test results, the relationships between the equivalent stiffness, damping ratio and number of cycles as well as the magnitude of shear strain were examined.

关键词： High-damping rubber bearing velocity control algorithm Linear dynamic analysis Gravity simulator

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DYNAMIC PERFORMANCE STUDY ON THE SUPER HIGH DAMPING RUBBER ISOLATION BEARINGS DEPEND ON THE REAL-TIME SUBSTRUCTURE HYBRID LOADING SYSTEM

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12th International Symposium on Structural Engineering (ISSE-12)

作者： Yi, Liu Yuan, Yong Ai, Demi Xian City Municipal Construct Grp CO LTD Xian Peoples R China Huazhong Univ Sci & Technol Dept Civil Engn & Mech Wuhan Peoples R China Huazhong Univ Sci & Technol Hubei Key Lab Control Struct Wuhan Peoples R China

ISBN: (纸本)9787030357878

In this study, the developed real-time substructure hybrid earthquake loading test system for verification tests of rubber bearings for highway bridges and viaducts is studied. A series of the fast/real time substructure hybrid earthquake loading tests on NR (natural rubber), HDR (high-damping rubber), and HDR-S (super-high-damping rubber) bearings specimens are presented. The test system utilizes the concepts of the real-time pseudodynamic test method and the substructure technique to combine the loading process of rubber bearing specimens and numerical modeling of bridge column and girders. The objective of the development of the test system is to pursue accurate prediction of the seismic response and investigate the isolation effects of rubber bearings considering the loading rate effects subject to earthquake ground motion.

关键词： Real-time hybrid loading system high-damping rubber bearing velocity control algorithm linear dynamic analysis gravity simulator

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DYNAMIC PERFORMANCE STUDY ON THE SUPER HIGH DAMPING RUBBER ISOLATION BEARINGS DEPEND ON THE REAL-TIME SUBSTRUCTURE HYBRID LOADING SYSTEM

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The Twelfth International Symposium on Structural Engineering

作者： Liu Yi Yong Yuan Demi Ai Xian City Municipal Construction(Group) CO. LTD Dept.of Civil Engineering and Mechanics Huazhong University of Science and Technology Hubei Key laboratory of Control Structure Huazhong University of Science and Technology

ISBN: (纸本)9787030357878

In this study,the developed real-time substructure hybrid earthquake loading test system for verification tests of rubber bearings for highway bridges and viaducts is studied.A series of the fast/real-time substructure hybrid earthquake loading tests on NR(natural rubber),HDR (high-damping rubber),and HDR-S(super-high-damping rubber) bearings specimens are presented. The test system utilizes the concepts of the real-time pseudodynamic test method and the substructure technique to combine the loading process of rubber bearing specimens and numerical modeling of bridge column and *** objective of the development of the test system is to pursue accurate prediction of the seismic response and investigate the isolation effects of rubber bearings considering the loading rate effects subject to earthquake ground motion.

关键词： Real-time hybrid loading system high-damping rubber bearing velocity control algorithm linear dynamic analysis gravity simulator

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