Reinforcement of steel moment frame with linked beam to column (LCF) system by nonlinear static and time history analysis

Document Type : Research Article

Authors

1 Professor of Structural Engineering, Dean of Faculty of Civil Engineering, Semnan University

2 MSc

Abstract

Based on the SAC building plan, three, six, and nine-story buildings have been taken into consideration for this purpose. After verifying the models presented by the researchers, 4, 8, and 16-floor bending frames were designed according to the 1st and 4th editions of the codes for the Design of Buildings against Earthquakes (Standard 2800) and then the frames designed with the 1st edition were designed by the frame and column system until reaching Changing the location of the target was reinforced. After that, the reinforced and designed frames with 1st and 4th editions were analyzed under 7 pairs of near and far field accelerograms. According to the results of non-linear static analysis and dynamic analysis of the time history of the force difference percentage in the target displacement of the structure designed according to the 1st and 4th editions, the target is 27 to 50%, the percentage difference in the yielding deformation of the structure designed according to the 1st edition to the retrofitted one is about 5 Up to 42%, the percentage difference of the behavior coefficient of structures designed according to the 1st edition and retrofitted is from 4 to 40%. In a 4-floor structure, it causes a 13.34% reduction in displacement and a 14.06% reduction in IDR. Similarly, in the case of 8-floor structures, this reduction is measured as 20.92% for displacement and 20.81% for IDR, respectively. In the evaluation of the 16-floor structure designed based on the 1988 edition and adding the extension system, it was found that the addition of the extension system to the 16-floor structure causes a decrease of approximately 51.43% in displacement and approximately 26.89% in IDR. Adding the extension system to the 4-floor structure has significant changes. It generates 59.99% in displacement and 24.53% in IDR. Similarly, in the 8-floor structure, we experience a 59.99% reduction in displacement and 22.82% in IDR. In addition, in the 16-floor structure, displacement is reduced by 59.99% and IDR is reduced by 23.96%.

Keywords

Main Subjects

References

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Amirkabir Journal of Civil Engineering
Volume 57, Issue 1
April 2025
Pages 157-198

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