International Research Journal of Engineering and Technology (IRJET) Volume: 09 Issue: 06 | Jun 2022
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e-ISSN: 2395-0056 p-ISSN: 2395-0072
Seismic optimization of an I shaped shear link damper in EBF and CBF systems Ameera Hydrose1, Benoy Benjamin2 1PG
student ,Dept. of Civil Engineering ,KMEA College of Engineering, Kerala, India Asst.Professor, Dept. of Civil Engineering ,KMEA College of Engineering, Kerala , India ---------------------------------------------------------------------***--------------------------------------------------------------------2. OBJECTIVES Abstract – Most of the steel structures that are constructed 2
in earthquake prone areas are susceptible to frequent damages. Hence variegated types of results were introduced as a part of reducing the threat of damages. One of the main solutions to impart sufficient flexibility to steel framed structure is the installation of dampers. To improve the seismic energy dissipation capacity of braced frames, an I shaped shear link damper can be effectively used. As a part of the study, a single-story single span frame in concentrically braced frame (CBF) system with I-shaped damper was evaluated and analytically treated to lateral seismic load. The main ideal of the study is to identify the optimum size of this I shaped shear link damper which enhance both max loads bearing capability and resilience of the frames.
• To create a full-scale model of a steel structure that is braced and unbraced. • To determine the optimum size of the damper in a fullscale model using nonlinear push over analysis in CBF to increase seismic energy dissipation capacity.
3. METHODOLGY The study's major goal is to improve seismic performance in terms of ductility and maximum load carrying capacity by optimizing the size of the damper for a concentrically braced structure of certain dimensions. As part of the study to examine seismic performance, a single-story single bay frame with and without bracing is investigated. The CBF is then fitted with an I-shaped shear link damper of various damper proportions, and a pushover study is performed to determine the appropriate damper size. An EBF with these dampers is subjected to pushover study in order to determine the appropriateness of optimum sized damper in such systems. Complete analysis is performed using the ANSYS WORKBENCH software.
Key Words: CBF, pushover analysis, ANSYS, lateral load, EBF, damper, frame 1. INTRODUCTION In structural integration, diagonal divination can be used as a basic system, while multi-component integration can be a more complex one. The structure's configuration and appearance can determine whether bracing is necessary. In general, concentrically braced frames and eccentrically braced frames (EBF) are most common. A conventional EBF is characterized by eccentrically coupling the braces to the beam, and the bridge is the beam section between the brace and beam. [1,2]
4. NUMERICAL STUDY 4.1 Modelling of frames The indirect response of a single-story steel frame is tested. ANSYS WORKBENCH is used to carry out the entire analysis. The bay's columns are allowed to curve on their own axis, with a 4- meter story height. The columns and beams are made of steel I sections. The beam, which spans 9 meters, is braced by steel bracings with round cross sections Details of each individual component are listed in Table 4.1. 345 MPa, 345 MPa, and 317 MPa are the yield stresses of the beam, column, and bracing, respectively. [7]
In concentrically braced frames, two braces intersect at a common point in the beam. Basically, these frames are strong enough to provide a permissible range of relocation. Due to buckling of the bracing and insufficient ductility, this type of system has poor performance and incorrect behavior in terms of energy absorption during intense earthquake loads.[3,4]In order to keep the diagonal member from buckling, using energy dissipating dampers can restrict the damage to the dampers as a result, other parts of the structure stay elastic, which could also improve their serviceability.[5] The usage of an I-fashioned shear hyperlink damper in metallic frames improves seismic performance at the same time as being cost-effective. Furthermore, these dampers are without problems replaceable in the occasion of an earthquake. [6]
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Impact Factor value: 7.529
The damper is designed as an I section with a web and flanges. The I-shaped damper is likewise made of steel. Steel is 7850 kg/ dense and has a Young's modulus of 200000 MPa. It has a Poisson's ratio of 0.3 as well. The damper has a yield stress of 370MPa.[6] The proposed damper can be seen in Figure 1.
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