Bulletin of Earthquake Science and Engineering

Bulletin of Earthquake Science and Engineering

Evaluation and Comparison of Plastic Performance of Steel Frames with ten Types of New Braces during Pushover Analysis

Document Type : Research Note

Author
Masoud Mahdavi
M.Sc. Graduate, Department of Structures, Faculty of Civil Engineering, K. N. Toosi University of Technology, Tehran, Iran
10.48303/bese.2024.2028023.1159
Abstract
In order to investigate the behavior of the structure during the earthquake and after it ends, the design engineers examine the performance criteria, including the nonlinear performance of parameters including force, deformation, and yielding mechanism of the structure. Structural design criteria include lateral forces and resistance of members, structural yielding mechanism, story displacement, and performance level that should be checked during structural design. In the plastic performance of the structure, the target relative displacement criteria and the yield mechanism are very important in investigating this performance zone. Among the very important factors in the nonlinear zone are plastic hinges, which investigated in the present study in 10 types of modern braces. For this purpose, a reliable and validated questionnaire was compiled using the opinions of experts in the field of structural engineering. This questionnaire has 6 criteria, the opinions of 70 university professors and PhD students were collected by it. In creating the hierarchical research tree, widely used models including goals and criteria were used. The initial criteria were determined with the help of library studies and the opinions of structural engineering experts. The 6 criteria include "Base shear force", "Pushover curve", "Story displacement and drift", "Bending and shear forces and Torsional anchor", "Plastic hinges" and "Modal periodic time and frequency". Using Cronbach's alpha formula for unlimited societies, the validity of the questionnaire was determined, which was determined as 0.9014. Therefore, questionnaires have high reliability in grades and questions. Then, the average scores collected from the statistical population were entered as primary data in the Expert Choice software. With the hierarchical analysis method in this software, the input data were weighted and finally prioritized. Then, 2D steel frames that have 10 steel braces including Diagonal, Gate, V, Inverted V, Knee, Rhombus, Eccentrically with lateral horizontal link beam, Zipper, Cross, Eccentrically with middle horizontal link beam were modeled by SAP2000 software. The performance of all bracing systems was compared with a steel moment frame (SMF). The steel structures have 4 and 8-story, all the structures were analyzed by nonlinear static analysis (pushover analysis). The results showed that the plastic hinge criterion with an impact factor of 0.424 is the most important parameter of the structure's performance in the plastic zone. Also, the eccentrically braced frame with the middle horizontal link beam (in the 4-story structure) had a total of 33 plastic hinges and the zipper brace (in the 8-story structure) had a total of 49 plastic hinges, which increased by 60.98% and 48.04%, respectively. The plastic hinges were compared to the average of the total braces. The use of each of the 10 mentioned braces in 4 and 8-story structures reduces displacement by 33.65% and 19.27%, respectively, compared to the SMF.
Keywords
Steel Structure
Plastic Hinge
Pushover Analysis
Analytic Hierarchy Process
New Bracing Systems

Subjects

 
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  • Receive Date 03 May 2024
  • Revise Date 24 July 2024
  • Accept Date 19 August 2024