چكيده به لاتين
The study of different structures after the earthquake shows that the behavior of the structures during the earthquake is clearly controlled by various factors such as the shape or the characteristics of the building. Due to these factors, earthquake codes have been developed in different countries, and the relationships in Iran Code are derived from the relationships in various codes. These empirical relationships are usually obtained by conducting various experiments on existing buildings and measuring their periodicity. Due to the direct relationship between design parameters such as building base shear and periodicity of structures, accurate estimation of periodicity is important. Earthquake Regulations have divided the structures into two regular and irregular structures. The irregularities are divided into the following two categories: irregularities in height and irregularities in plan in addition to the empirical relationships, the alternation time in the by-law is only a function of design, and irregularities in altitude and plan are not considered.
This study investigates the effect of irregularities on the periodicity of structures and investigates the accuracy of the experimental periodicity of Iran Regulations on bending steel frames and comparing it with the periodicity of computer analysis. In this research, in this study, by analyzing computer system on 8 regular buildings with medium and special steel bending frame system from 5 to 20 floors, they obtained their analytical alternation time and their alternation time. The comparisons were made with the rules of procedure. Then, different modes of geometrical irregularity, both in elevation and in plan, were created separately on 24 buildings in different classes and the alternation time variations were studied and finally all the results were obtained with the results of the bylaws. 2800 Iran and ASCE-7 Regulations were reviewed and compared.
