A5059452894- Vibration Control and Rheological Fluids
- Seismic Performance and Analysis
- Structural Engineering and Vibration Analysis
- Structural Health Monitoring Techniques
- Structural Response to Dynamic Loads
- Vibration and Dynamic Analysis
- Structural Behavior of Reinforced Concrete
- Hydraulic and Pneumatic Systems
- Geophysics and Sensor Technology
- Railway Engineering and Dynamics
- Effects of Vibration on Health
- Transportation Safety and Impact Analysis
- Innovative concrete reinforcement materials
- Concrete Corrosion and Durability
- Vehicle Dynamics and Control Systems
- Control Systems and Identification
- Bladed Disk Vibration Dynamics
- Advanced Measurement and Metrology Techniques
- High-Velocity Impact and Material Behavior
- Agriculture and Farm Safety
- Seismic and Structural Analysis of Tall Buildings
- Shape Memory Alloy Transformations
- Structural Load-Bearing Analysis
- Innovative Energy Harvesting Technologies
- Masonry and Concrete Structural Analysis
University of Tennessee at Knoxville
2015-2024
ORCID
2024
Knoxville College
2016-2023
University of Illinois Urbana-Champaign
2009-2015
This paper presents experimental and analytical work conducted to explore the feasibility of using an innovative technique for seismic retrofitting RC bridge columns shape memory alloys (SMAs) spirals. The high recovery stress associated with SMAs is being sought in this study as easy reliable method apply external active confining pressure on improve their ductility. Uniaxial compression tests concrete cylinders confined SMA spirals show a significant improvement strength ductility even...
A new type of nonlinear energy sink (NES), termed a track NES, is proposed in this paper. The shape the over which auxiliary mass moves determines character restoring force for NES. After deriving equations motion numerical optimization carried out system implemented two-degree-of-freedom primary structure. results are fourth-order polynomial. performance NES compared with an equivalent tuned damper (TMD) and Type I utilizes cubic force. comparison show that attenuation observed competitive...
The nonlinear energy sink (NES) is a fully passive attachment used to rapidly dissipate significant portion of induced in linear primary structure which it attached. In this study, the performance Type III NES reducing response large when subjected shock-type loading evaluated experimentally. two-degree-of-freedom device comprising two relatively lightweight masses series coupled together and through essentially (i.e., nonlinearizable) stiffness elements. essential nonlinearity corresponding...
SUMMARY Shake tables provide a direct means by which to evaluate structural performance under earthquake excitation. Because the entire structure is mounted on base plate and subjected ground motion in real time, dynamic effects rate‐dependent behavior can be accurately represented. table control not straightforward as desired signal an acceleration record, while most actuators operate displacement feedback for stability. At same payload typically large relative capacity of actuator, leading...
Summary This paper proposes a single‐sided vibro‐impact track nonlinear energy sink (SSVI NES) as an effective way to mitigate the effects of impulsive and seismic excitation on building structures. The SSVI NES is passive dissipation device, which consists mass moving along track, shape provides restoring force mass. Previous studies have analyzed NES, considers be smooth symmetric. By introducing discontinuity into (e.g., through impact), in primary structure can scattered higher frequency...
We consider the response of a linear structural system when coupled to an attachment containing strong or even essential nonlinearities. For this system, attachment, designated as nonlinear energy sink, is designed vibration absorber, serving dissipate from system. Moreover, not only leads reduction in total but also nonlinearly couples together modes When structure impulsively loaded, sink serves both and redistribute energy, thus enhancing observed dissipation. The effect on primary can be...
Summary This paper presents a track nonlinear energy sink (track NES) and single‐sided vibro‐impact (SSVI as effective control strategies to mitigate the seismic response of high‐rise buildings. The study commences with analytical models NES SSVI state‐space description system. Subsequently, single‐objective multi‐objective optimizations are conducted, performance these devices is evaluated comprehensively in terms effectiveness economic factors when attached representative 32‐story...
Summary Track nonlinear energy sinks (track NESs) have been shown to be an effective and applicable strategy mitigate structural response in recent years. However, previous studies on track NESs has mainly focused demonstrating the benefits of through numerical simulations experiments, with relatively little attention paid analytical understanding unique dynamics NESs. This study analyzes responses a NES when subjected impulsive harmonic excitations by balance method. Special is given cause...
The inerter-based isolation system, which comprises an inerter, a dashpot, and spring, has been shown to be effective for improving the dynamic performance of isolated structures. However, underlying theoretical basis its vibration control mechanism not studied superstructures with system; in particular, functionality inerter explicitly demonstrated. In this study, displacement mitigation is established by deriving fundamental equation, designated as demand equation. explained clarifying...
For many years there has been interest in using fiber-reinforced polymers (FRPs) as reinforcement concrete structures. Unfortunately, due to their linear elastic behavior, FRP reinforcing bars are never considered for structural damping or dynamic applications. With the aim of improving ductility and capability structures reinforced with reinforcement, this paper studies application SMA–FRP, a relatively novel type composite superelastic shape memory alloy (SMA) wires. The cyclic tensile...
Recent research has shown the viability of using nonlinear energy-sink (NES) devices for vibration mitigation in mechanical and structural systems. When attached to a primary structure, these lightweight passive can effectively reduce response through their stiffness properties. In this research, two-degree-of-freedom NES device is designed innovative elastomeric bumpers as critical components providing restoring forces. A number bumper configurations are evaluated experimentally, effect...
SUMMARY This study proposes an innovative passive vibration mitigation device employing essentially nonlinear elastomeric springs as its most critical component. Essential nonlinearity denotes the absence (or near absence) of a linear component in stiffness characteristics these springs. These devices were implemented and tested on large‐scale nine‐story model building structure. The main focus is to mitigate structural response under impulse‐like seismic loading when structure remains...
In this study, a novel passive vibration control device, the three-element absorber–inerter (TEVAI) is proposed. Inerter-based absorbers, which utilize mass that rotates due to relative translational motion, have recently been developed take advantage of potential high inertial (inertance) relatively small in rotation. work, configuration an inerter-based absorber proposed, and its effectiveness at suppressing single-degree-of-freedom system investigated. The proposed device development two...