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Article
Engineering, Geological
Marina E. Kalogerakou et al.
Summary: This article proposes a novel vertical Stiff dynamic absorber (SDA) that aims to minimize vertical accelerations induced on the structure and keep the displacement within reasonable limits. The optimized design parameters of the SDA are applicable across a wide range of vertical vibration control applications, achieving great acceleration isolation without compromising the weight-bearing capacity of the structure.
BULLETIN OF EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Geological
Naqeeb Ul Islam et al.
Summary: This study investigates the use of novel combinations of true negative stiffness dampers (NSDs) and inerter devices as supplemental dampers for base-isolated structures. The optimal parameters for NSD and three configurations of negative stiffness inerter dampers (NSIDs) are derived using classical H infinity optimization. Numerical searching and comparative analysis are used to verify the effectiveness of the derived parameters. The results show that the optimal NSIDs and NSD effectively control the objective variables of the base-isolated structure, especially under near-fault earthquakes. The proposed supplemental dampers improve energy dissipation capacity and cushion against failure.
BULLETIN OF EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Geological
Daniele Zahedin Labaf et al.
Summary: This paper proposes a hybrid control system combined with a base isolation system and a tuned mass damper inerter for the protection of steel storage tanks from seismic damages. The effectiveness of the system is assessed through optimal design and parametric analysis.
BULLETIN OF EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Civil
Ajay Chourasia et al.
Summary: The paper establishes a relationship between the strength of laterite units and mortar to predict the strength and elastic modulus of laterite masonry. Numerical studies were conducted on various levels of laterite confined masonry buildings and their seismic behavior was analyzed. The results showed that three storey LCM buildings demonstrated resistance within permissible limits, while four storey buildings exhibited stress concentrations exceeding the limits, indicating the need for increased wall thickness in the ground storey.
JOURNAL OF STRUCTURAL INTEGRITY AND MAINTENANCE
(2023)
Editorial Material
Engineering, Geological
Agathoklis Giaralis et al.
BULLETIN OF EARTHQUAKE ENGINEERING
(2023)
Article
Engineering, Civil
Sudip Chowdhury et al.
Summary: This paper studies the optimal design of inertial amplifier base isolators (IABI) for mitigating the dynamic response of multi-storey buildings under base excitations. The H-2 optimization method is used to obtain closed-form expressions for the optimal design parameters of IABI. The effectiveness of these expressions is evaluated by comparing the frequency and time domain responses of isolated structures to those of uncontrolled structures. The results show that the response reduction capacity of the optimal inertial amplifier base isolator is increased by 50% to 60% compared to traditional base isolators.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2023)
Article
Engineering, Mechanical
Sudip Chowdhury et al.
Summary: This paper introduces a method of combining negative stiffness devices with inerters to traditional base isolators and tuned mass dampers. The optimal design parameters of these novel passive vibration dampers are derived using H2 and H & INFIN; optimization methods. The results show that the optimized negative stiffness inerter-based base isolators and tuned mass dampers outperform traditional base isolators and tuned mass dampers in terms of dynamic response reduction capacity.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Sudip Chowdhury et al.
Summary: This paper introduces the use of nonlinear inertial amplifier base isolators (NIABI) for reducing the dynamic response of structures. The NIABI is installed inside traditional base isolators (TBI) to enhance vibration reduction. The equivalent linearization method is applied to linearize the highly nonlinear equations of motion of NIABI and derive optimal closed-form solutions for design parameters. The dynamic response reduction capacities of the optimized NIABI are significantly higher than those of the optimized TBI. The efficacy of the optimum NIABI is further studied numerically, showing superior displacement and acceleration response reduction compared to the optimum TBI. The nonlinearity of the inertial amplifiers increases the dynamic response reduction capacity of base isolators. The results are mathematically accurate and suitable for practical applications.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Civil
Sudip Chowdhury et al.
Summary: This paper introduces the design of negative stiffness inerter-based base isolators, which enhance the dynamic response reduction capacity of conventional base isolators by installing negative stiffness devices and inerters. These novel isolators have been installed at the base of multi-storey buildings to mitigate their dynamic responses during vibration.
Article
Materials Science, Multidisciplinary
Sudip Chowdhury et al.
Summary: This study presents two novel friction-based isolators, NIARFBI and NIAFPS, which are placed at the base of multiple degrees of freedom (MDOF) systems to reduce their dynamic responses. The design parameters for each isolator are derived using the H-2 optimization approach, and the dynamic responses are analyzed using the established transfer function. The results show that the displacement and acceleration reduction capacities of the optimum NIARFBI and NIAFPS are significantly superior to the traditional FRBI and FPS.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Civil
Cheng Fang et al.
Summary: The study introduces a novel type of SMA-HDR bearing with efficient restraint effect and energy dissipation capability, suitable for near-fault earthquake regions. The bearing design can significantly reduce bridge vibrations, mitigate potential seismic damage, and effectively alleviate pounding effect.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2022)
Article
Engineering, Mechanical
Sudip Chowdhury et al.
Summary: This paper derives the optimal design parameters for two different base isolation configurations, grounded and ungrounded, using H2 and H-infinity optimization methods. The performance of these isolators is compared through frequency domain and time history analysis, showing that grounded isolators have significant advantages. The results demonstrate the mathematical accuracy and feasibility of the proposed isolators for practical design purposes.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Abdul Qahir Darwish et al.
Summary: This study evaluates the effectiveness of base isolation in composite buildings by comparing their seismic responses with reinforced concrete (RC) buildings and fixed-base composite buildings. The results show that base-isolated composite buildings perform better in all levels of storeys compared to RC and fixed-base composite buildings, making them a suitable option for high-rise, mid-rise, and low-rise buildings.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2022)
Article
Engineering, Mechanical
Marco Furinghetti
Summary: In recent years, there has been significant research on traditional and innovative seismic isolation techniques, resulting in wide application of such techniques in regions with high seismic hazard. This study aims to provide practitioners with simple procedures for the initial design of building isolation devices, based on common typologies of isolators. The study uses simplified approaches and statistical analysis to determine the mechanical properties of the implemented devices. Results from a validation study demonstrate the effectiveness of the design procedures.
Review
Engineering, Mechanical
P. S. Balaji et al.
Summary: This review discusses the application of nonlinearity in passive vibration control devices, showing how nonlinearity is applied and beneficial in the systems. Nonlinearity has also been successfully applied in energy harvesting devices, nonlinear energy sinks, and metamaterials for vibration isolation and energy harvesting purposes. The implementation of nonlinearity in engineering systems has shown significant benefits over linear systems.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2021)
Review
Engineering, Mechanical
David J. Wagg
Summary: This paper reviews the nonlinear aspects of mechanical inerters and their historical development. It covers the development and application of nonlinear inerter devices, as well as discussing rocking structures with inerters attached and future research directions.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Mechanical
Baris Can Yalcin et al.
Summary: Zero-power micro vibration isolators based on hybrid electromagnets have potential applications in various industrial and academic fields due to providing mechanical contact free micro vibration isolation with low energy consumption. Controllers based on linear matrix inequality (LMI) techniques can minimize disturbances in 3-DoF micro vibration isolation, and experimental results show the effectiveness of this approach.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Geological
Chunxiang Li et al.
Summary: The nonlinear BIS-TMDI system can significantly reduce the displacement demand of the isolation layer, showing better control effectiveness and stroke performance compared to the nonlinear BIS-TMD system. Additionally, the system demonstrates greater robustness in mitigating vibrations.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2021)
Article
Engineering, Mechanical
R. S. Jangid
Summary: This study determines the optimal damping and tuning frequency ratio of the tuned inerter damper for base-isolated structures to maximize energy dissipation index and minimize relative displacement and absolute acceleration. Explicit formulas for TID damping and tuning frequency under white-noise excitation are derived, which are found to be useful for effective design applications in dynamical systems. The designed TID was found to be more effective under soft soil conditions, and it effectively controls displacement and acceleration response of the base-isolated structure under non-stationary earthquake excitation, especially for a higher inertance mass ratio.
JOURNAL OF VIBRATION ENGINEERING & TECHNOLOGIES
(2021)
Article
Engineering, Civil
Jiying Shang et al.
Summary: This study introduces a variable friction mechanism into a traditional friction pendulum bearing by developing a variable friction bearing (VFPB) with a new friction composite. The VFPB is developed using simple processing technology, and a method for determining the active sliding band based on friction coefficient is proposed. The force-displacement relationships and relevant parameters of the VFPB are derived, and parametric studies investigate the effects of friction coefficient and number of sliding bands on its behavior.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Yutao Pang et al.
Summary: A novel methodology based on seismic risk was proposed for the optimization design of SMA-restrained sliding bearings for highway bridges subjected to near-fault ground motions. Identical component fragility curves were derived to minimize the seismic risk, and the Particle Swarm Optimization (PSO) approach was implemented to obtain optimal mechanical properties. This methodology can significantly reduce computational effort while maintaining optimal results.
ENGINEERING STRUCTURES
(2021)
Article
Engineering, Civil
Ruisheng Ma et al.
ENGINEERING STRUCTURES
(2020)
Article
Construction & Building Technology
Konstantinos N. Kalfas et al.
JOURNAL OF STRUCTURAL ENGINEERING
(2020)
Article
Construction & Building Technology
Hongxin Sun et al.
STRUCTURAL CONTROL & HEALTH MONITORING
(2019)
Article
Engineering, Civil
Zhipeng Zhao et al.
ENGINEERING STRUCTURES
(2019)
Article
Engineering, Civil
Feng Qian et al.
ENGINEERING STRUCTURES
(2019)
Proceedings Paper
Engineering, Mechanical
Feng Qian et al.
ACTIVE AND PASSIVE SMART STRUCTURES AND INTEGRATED SYSTEMS XIII
(2019)
Article
Engineering, Geological
D. De Domenico et al.
SOIL DYNAMICS AND EARTHQUAKE ENGINEERING
(2018)
Article
Engineering, Civil
Dario De Domenico et al.
EARTHQUAKE ENGINEERING & STRUCTURAL DYNAMICS
(2018)
Article
Engineering, Geological
Giovanni Maria Montuori et al.
BULLETIN OF EARTHQUAKE ENGINEERING
(2016)
Article
Engineering, Geological
Abdolrahim Jalali et al.
BULLETIN OF EARTHQUAKE ENGINEERING
(2011)
Article
Acoustics
V. A. Matsagar et al.
JOURNAL OF VIBRATION AND CONTROL
(2010)
Article
Engineering, Civil
VA Matsagar et al.
ENGINEERING STRUCTURES
(2003)
