SUMMARY In this study, we propose a new seismic control device, tuned viscous mass damper (TVMD), for building systems. We give detailed description of an apparent amplifier using ball‐screw mechanism, which is one the most important components realizing device. also derive closed‐form solution optimum design single‐degree‐of‐freedom structure subjected to harmonic excitation. The performance device compared with those conventional and vibration system TVMD shown be effective linear...

Interactions among an inerter, spring, and energy dissipation element (EDE) in inerter system can result a higher efficiency compared to single identical EDE, which is referred as the damping enhancement effect. Previous studies have mainly concentrated on vibration mitigation effect of without explicit consideration or utilization mechanism. In this study, theoretical essence discovered, universal design principle proposed for system. A fundamental equation found demonstrated basis...

A new seismic control device using a ball screw mechanism as an apparent mass amplifier has been developed, which is referred to the tuned viscous damper (TVMD). This enables effective mass. For multiple-degree-of-freedom (MDOF) system incorporated with TVMD, design method based on numerical optimization previously presented by authors. However, simpler methods that are suitable for practical have not yet presented. At preliminary stage, it essential structural designers understand response...

Interstory isolation systems have recently gained popularity as an alternative for seismic protection, especially in densely populated areas. In inter-story isolation, the system is incorporated between stories instead of base structure. Installing simple, inexpensive, and disruption free retrofit applications. Benefits include nominally independent structural where accelerations added floors are reduced when compared to a conventional system. Furthermore, shear demand on total structure not...

Abstract Rate‐independent linear damping (RILD), which is also known as structural or hysteretic damping, refers to a type of having constant imaginary part in its complex stiffness that generates forces independent the excitation frequency. In contrast, viscous (LVD) another with frequency‐proportional stiffness, resulting proportional RILD demonstrates similar performance LVD for same loss factor when incorporated structure control seismic response displacement. Nevertheless, force...

Abstract Connecting a flexible supporting element to an inerter arranged in parallel with viscous yields tuned‐mass damper‐like system, designated as tuned mass damper (TVMD). The advantage of TVMD is that it exploits the flexibility member, which usually considered compromise energy‐dissipating performance, and soft spring form supplemental oscillator enhance damping performance resonance primary structure. fixed‐point method for optimal design single‐degree‐of‐freedom structure containing...

This study examines the performance of rate-independent linear damping incorporated into a low-frequency structure subjected to strong ground motion. Linear viscous and are known yield similar response displacements velocities during earthquakes. If central frequency is close fundamental structure, two elements almost identical forces. However, if frequencies differ significantly, these substantially different forces, resulting in floor-response accelerations. The benefit that it yields...

This paper investigates the validity of tuned inertial mass electromagnetic transducer (TIMET) applied to building structures subjected seismic motions. The TIMET is a device inspired by two innovative structural control devices proposed recently, that is, viscous damper and transducer. consists spring, an produced ball screw mechanism, part composed motor electrical circuit. stiffness spring such resonates with vibrating building. makes installed in parallel run up efficient way, vibration...

This research reports on the experimental verification of an enhanced energy conversion device utilizing a tuned inerter called inertial mass electromagnetic transducer (TIMET). The TIMET consists motor, rotational mass, and tuning spring. motor are connected to ball screw spring interfaced is vibrating structure. Thus, vibration structure absorbed as electrical by motor. Moreover, amplified can be realized rotating relatively small physical masses. Therefore, designing stiffness...

ABSTRACT Shake table control is greatly affected by an interaction with a heavy specimen, especially when it has severe nonlinear characteristics. Hence, to this fundamental and challenging issue in the experimentation, study proposes solution using signal‐based (NSBC) demonstrates its effectiveness actual experiments. Moreover, innovative controller design presented paper: bare condition referenced (BCR) approach relies on dynamics specimen's weight. It frees from properties of controlled...

The devastating low-frequency ground motions of the 2011 Great East Japan Earthquake produced large displacements in structures previously thought to be safe, including base-isolated structures. Rate-independent linear damping (RILD) is a promising model for because it provides direct control over displacement. Because force generated by RILD proportional displacement (advanced phase π/2 radians) and independent frequency, performs well under both more common higher-frequency (relative...

In the 2011 Great East Japan Earthquake, low-frequency components of ground motion brought long-duration shaking to high-rise buildings in mega-cities far from epicenter, resulting damage their interior and exterior walls, unsafe conditions for building occupants. Rate-independent linear damping (RILD) has been suggested as a viable option simultaneously reducing excessive displacement floor response acceleration structure. While majority previous studies on RILD have mainly focused...

In this paper, cables are proposed to connect the inerter and main frame for translation-to-rotation conversion, i.e., cable-bracing system (CBIS), with a magnified mass enhanced damping effect. This novel configuration has benefits of deformation relaxation at connecting joints, easy installation, an adaptive layout nonconsecutive-story deployment. Dynamic motion equations were established single degree-of-freedom (SDOF) model equipped CBIS. The influence dimensionless parameters, such as...

In this study, an optimal design of a tuned viscous mass damper (TVMD) incorporated into single-degree-of-freedom structure system subjected to earthquake-induced random vibrations is studied. Closed-form formulas the frequency ratio and damping are proposed for control structural displacement acceleration responses based on H2 norm optimization. The solutions exist when smaller than 0.11. calculated parameters close each other, which indicates that can be controlled simultaneously with...

In this paper, comparison is made between vibration control systems using viscous damper, mass damper and tuned damper. It shown that the system most effective for linear structural with dampers having same damping ratio. Effectiveness of present verified conducting shaking table tests small scaled dampers. And, applicability to non-linear subjected seismic ground motions also by performing time history analyses.

The authors have proposed the tuned viscous mass damper system based on fixed points theory, and proved validity of theory analysis method through vibration tests small scale test specimen. testing program revealed that an increase in equivalent inertial input resulted excessive stresses supporting member, body primary structure connected to damper. In this paper, built rotation slipping mechanism into main full-scale with spring member 18,200kN/m 1,350ton, tested force restriction...

The past two decades have witnessed the adverse effects of low-frequency components severe earthquakes in structures. development displacement control technologies for seismic protection structures has been identified as a growing challenge earthquake engineering. Related studies suggested that rate-independent linear damping (RILD) could be viable option reducing excessive displacements However, previous on RILD systems not extensively investigated their input energy during an earthquake....