Document Type : Original Article

Author

• Ashkan Khodabandehlou

Associate professor Civil Engineering Dept, Faculty of Engineering, Islamic Azad University, Urmia, Iran.

Abstract

In this study, the ratio of rotations created in beam and column members of reinforced concrete flexural frames, relative displacements of floors at the functional levels of uninterrupted serviceability, life safety and failure prevention have been investigated by considering different ratios for the weak beam-strong column criterion in the optimal design process within the framework of the performance-based design approach. For the purpose of performance-based optimization, the center of mass meta-exploration algorithm has been used in this study. The philosophy of the performance-based design approach and even traditional design methods allow the structure to suffer damage when exposed to strong and relatively strong earthquakes. Therefore, in order to estimate the safety of the structure against earthquakes, the use of seismic safety quantification indices and structural collapse capacity seems necessary. In this study, the relative displacements of floors and the ratio of existing to permissible rotations of beam and column members of each optimal structure have been calculated using time history analysis under earthquakes far and near the fault. Two examples of 3 and 6 stories are the frames studied in this research, which are designed by considering coefficients of 0.8, 1.2 and 1.6 to control the weak beam-strong column criterion in the performance-based optimization process. According to the obtained results, it is observed that increasing the weak beam-strong column ratio to control the aforementioned criterion in the optimization process leads to a decrease in the rotation ratio created in the beams and columns of the structure.

Keywords

• RC moment frame
• Optimization
• Performance base design
• Strong Column Weak Beam
• Rotation ratio

Main Subjects

• structure