A New Passive bar Damper Device for Alleviation of Structural Damages of Structures Subjected to Seismic Motions
Journal Title: Trends in Civil Engineering and its Architecture - Year 2018, Vol 1, Issue 3
Abstract
Passive energy dissipation devices have been successfully implemented in buildings around the world to reduce structural response, primarily due to earthquakes, but also for wind and other dynamic loading conditions. Passive systems do not require any external sources of power to operate and mitigate dynamic loadings. The focus of this study is to propose a new passive energy dissipation device, called bar damper (BD), for seismic response modification. A brief description of concept, placement, material properties, test setup and loading protocol of the proposed damper are presented. Also, the finite element (FE) analysis by means of FE analysis package, ABAQUS, was conducted to show the device effectiveness on the response reduction under applied load. From the results, it could be concluded that, the device dissipate a significant amount of energy together with a high strength capacity without degradation of stiffness. Earthquake event, as one of devastated natural hazards, is not predictable [1]. Therefore, structural engineers have significantly concerned about seismic damages of civil structures. Structural vibration control devices have been proposed to dissipate such a huge input energy to structures including, active, passive, and semi-active and hybrid vibration control systems. In active and semi-active systems, device needs to be supported by an external force or power to resist earthquake load. Unlike, passive systems do not require any external power and they operate as a secondary function or member of structures; reducing seismic input energy. As a result, the use of passive control devices to reduce seismic response of structures under seismic motions is becoming progressively widespread as they are not required any external energy applied and they are activated once seismic loads are set to the structure [2,3]. Further developments of these systems in different aspects such as design, theory, hardware, installation and specification have authorized important applications to industrial plant, bridges, and buildings. Such application can currently be seen in almost all seismically active zones around the globe, but primarily in the United States, Japan, New Zealand and Italy. Remarkable benefits have been proved while retrofitting of existing buildings are required as well as designing structures with high importance such as critical bridges, defense installations, hospitals and emergency response services. From the architectural point of view, major proposed structural controls including active and semi-active systems are designed to be installed at certain location of structures, as many of them are located in X, V or Z forms. (Figure 1) shows a few examples of installed devices proposed by different researchers [4-7]. Such installations restrict spaces which have to be used in structures and architectures must carefully consider the issue. Use of passive systems, particularly metallic dampers, as supplemental energy dissipating device is one of the earliest approaches adopted in seismic resilient design. Originally manufactured by Bechtel Corporation, ADAS damper is an evolution of earlier X-plate used as a damping source for piping systems [8]. Yielding of metals is one of the most effective, simple and economical mechanisms to dissipate earthquake input energy. The research in metallic passive energy dissipative devices has been conducted over the last three decades. Numerous metallic dampers have been proposed and installed [9,10]. Alongside Triangle Added Damping and Stiffness (TADAS), Added Damping and Stiffness (ADAS) dampers are the most commonly used metallic dampers in seismic design. Steel plate ADAS dampers have been the focus of many researchers in augmenting the energy absorbing capacity of a building. The aim of including metallic seismic energy absorbing devices in a structure is to take advantage of the hysteresis of metals to dissipate seismic input energy in specially designed and detailed regions of a structure and to avoid inelastic behaviour in the primary gravity load-resisting elements [11]. In designing structures for seismic loads, it is assumed that part of the seismic input energy is absorbed by specially designed structural elements through plastic deformation or hysteretic behaviour. Examples of these plastic energy absorbing elements are plastic hinges forming in beams of rigid frames, in concentric braces and in shear walls.
Authors and Affiliations
Khaled Ghaedi, Ahad Javanmardi, Zainah Ibrahim, Anas Shaiban, Usman Hanif, S Kashif Ur Rehman
Keywords
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- EP ID EP605070
- DOI 10.32474/TCEIA.2018.01.000115
- Views 68
- Downloads 0
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