International Research Journal of Engineering and Technology (IRJET)
e-ISSN: 2395-0056
Volume: 10 Issue: 07 | Jul 2023
p-ISSN: 2395-0072
www.irjet.net
Performance of profiled I shaped dampers as energy dissipation system for braced steel structure Shabana K Muhammed1, Biby Aleyas2 1Student, Dept.of Civil Engineering, ICET Mulavoor, Kerala,India
2Asst.Professor, Dept.of Civil Engineering, ICET Mulavoor, Kerala,India
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Abstract -During an earthquake, severe damages may
all forms of dampers are considered, including metallic, friction, tuned mass, and base isolations.
occur in the structural elements. In order to reduce the damages by earthquakes, dampers are used in the structures. It controls earthquake induced vibrations on buildings. Dampers absorb a significant amount of seismic energy to the structure and which is dissipated by them. In this study, I shaped profiled damper (IPDs) are used. The IPDs as ductile element in concentrically braced frame systems which is responsible for energy absorption and energy dissipation. Dampers are easily replaceable and economically feasible which controls the seismic mitigation on steel structure. The main objective of this study is to perform the lateral loading testing on a braced steel frame with and without damper. The parametric study is carried out by changing the parameters of the IPD dimensions to find the optimum size that is bests suited for the seismic performance of the structure. This study also focus on obtaining hysteresis performance and the energy dissipation capacity by placing IPD damper in a different bracing system. It is expected that using IPD damper in braced steel frame, the energy dissipation capacity is improved avoid buckling of bracing and the output parameters like stiffness, total dissipated energy, and hysteresis behavior are compared. The complete analytical model and extensive parametric studies will be carried out usinga ANSYs software.
The Concentrically Braced Frame (CBF) is one of the structural systems that, despite being used extensively worldwide, exhibits unsuitable behaviour when subjected to seismic pressure. As a result, scientists have worked very hard to modify this system's behaviours. Researchers put forth various design standards for CBFs (in line with EC8). Their findings demonstrated that the recommended design parameters enhance CBFs' earthquake performance. The buckling of the compression elements decreases the ductility and energy wasted by the system, despite the fact that it has a higher lateral stiffness than other lateral load resisting systems like Moment Resisting Frames (MRF) and Eccentrically Braced Frames (EBFs). Additionally, the expense of system rehabilitation is expensive due to the plastic hinges' transformation into the diagonal braces. Even while reducing the slenderness ratio enhances CBF performance, deterioration of stiffness and strength and a correspondingly considerable drop in energy absorption remain grave problems. This has caused researchers to consider the use of dampers in CBFs. Metallic dampers are more capable and cost-effective than other types of dampers for use in CBFs and to improve the capacity to dissipate energy. Despite their simplicity, these dampers have unique qualities including lower construction costs, simplicity of installation, increased energy absorption, and localization of damages to a particular portion. Additionally, the manufacture of these dampers does not require specialized tools or cutting-edge technology, which lowers the cost of metallic dampers. Additionally, metallic dampers' straightforward design and numerical simulation lower the design cost.
Key Words: I profiled dampers (IPDS)
1.I NTRODUCTION The focus of research over the past few decades has been on methods to save the main structural components and localize damage to a few particular components so that the structure's responses to powerful earthquakes may be managed. Three classifications of structural control are generally used: active, semi-active, and passive control. The hydraulic jacks, sensors, and power supply that the active and semi active systems may use to adapt the structural reactions to the imposed loads require specialized infrastructure, which raises the cost of construction. The cost of construction for passive systems, however, is determined by the complexity and material of the damper and is not dependent on the applied forces. These kinds of systems' major purpose is to dissipate or reduce the transmitted input energy into the structure via the passive control devices in order to avoid the formation of plastic hinges into the fundamental structural elements. As passive control devices,
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Metal dampers have the ability to transfer input energy using a variety of methods, including bending, shear, torsion, or a combination of them. The shear process, however, results in a high elastic stiffness and an ideal capacity for energy dissipation. These dampers can be divided into two groups: those that are added directly to the diagonal systems and those that can be installed on the diagonal systems. Examples of the first category include axial, shear, combteeth, slit, pre-bent strips, and ADAS dampers. The highquality construction and high price of these dampers make their use problematic even though they exhibit suitable
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