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Investigating the effect of different types of frames in a 15-story steel structure

•   Mr. Amir Hossein Derakhshan Nezhad ,  دانشجوی کارشناسی ارشد سازه، دانشکده فنی مهندسی، دانشگاه صنعتی خاتم الانبیا بهبهان، بهبهان، ایران ,   
•   Mahboubeh Mirzaei Aliabadi ,  Assistant Professor, Department of Civil Engineering, Technical and Engineering Faculty, Behbahan Khatam Alanbia University of Technology ,   
•   Mr. Alireza Derakhshan Nezhad ,  Bachelor of Civil Engineering, Department of Civil Engineering, Faculty of Technology and Engineering, Islamic Azad University Abadan ,   

Major Topic: Steel Structures|سازه های فولادی

Abstract

One of the main current debates in the civil engineering of structures and earthquakes is the better protection of structures and, in addition, residents against the destructive effects of destructive environmental forces such as wind and earthquakes. energy reduction systems have been widely used to reduce earthquake forces in buildings. One of the most important earthquake energy reduction systems is the viscous fluid damper in passive control, which is suitable for seismic protection of structures and has a significant effect on the seismic response of structures. In this research, the implementation of 4 types of fifteen-story steel skeleton with viscous fluid damper, special 7-divergent brace, medium bending frame and special converging brace were evaluated by ETABS software, subject to dynamic time history analysis and nonlinear static modeling method. The results showed that the addition of viscous damper reduces the effects of seismic force, including base shear, displacement, and periodicity, compared to the special 7-divergent brace, the special converging brace (diagonal), and the average bending frame by 23%, 46%, 72% and 36%, 73%, 106% and 31%, 59%, 94%, respectively and the amount of damage in the structural floors and structural members is less compared to other frames and braces.

Keywords

Viscous fluid damper; nonlinear static analysis; time history analysis; convergent brace

• 1) The frame with viscous damper increased the energy absorption ability of the structure compared to the medium bending frame and convergent (diagonal) brace and divergent 7 brace, and the model with viscous damper also increased the stiffness of the structure compared to the medium bending frame.
• 2) The steel frame equipped with viscous damper reduced the overall displacement of the structure compared to braces and bending frame, which indicates an increase in the seismic load capacity of the structure.
• 3) Viscose dampers should be considered as the best option for tall buildings. Due to the lower damping energy, it is more suitable in controlling the vibration of the structure during an earthquake.
• 4) The use of dampers in the structure compared to the braces and bending frame showed that it effectively reduces the acceleration of the structure and the structure equipped with these systems can have the level of life safety performance under the desired risk.
• 5) The life safety performance level of the plastic joint formed in the structure with medium bending frame exceeded the permissible limit.