Investigating the seismic behavior of steel frame metal structures under the effect of earthquakes using wavelet transformation

Mohammad Hosseini¹

1) 1. PhD Student at ISLAMIC AZAD UNIVERSITY, Arak Branch, Iran

محل انتشار : هفتمین کنفرانس بین المللی پژوهش در علوم و مهندسی و چهارمین کنگره بین المللی عمران، معماری و شهرسازی آسیا(7icrsie.com)
Abstract :
Investigating the seismic behavior of structures using wavelet transform is a very accurate and new method compared to traditional methods. Based on this, in this research, the seismic behavior of structures has been investigated using the wavelet transform method and its related concepts. The models used in this research are: three frames that are considered in three states of 4, 8 and 12 floors, which represent medium, short and tall frames. The number of openings is three, and the length of the openings is defined as five meters, and the height of the floors is three meters for all floors. The structural characteristics of the investigated steel frames are considered to be non-linear geometrical and the type of structural system of the investigated frames is selected as a bending and fixed frame. The used type of dynamic analysis is nonlinear time history, in such a way that the accelerometers of three Anza, Loma, and Coyote Lake earthquakes have been applied to the examined frames. Finally, after analyzing the data, it was found that under applied earthquakes, in the short order frame, the wave associated with a higher frequency occurred at the end of loading, and in the high order frame, this trend was the opposite, and at the beginning of loading, the wave related to A higher frequency, i.e. level five wavelet, appeared and occurred in the mid-order frames almost in the middle of the loading time.
Keywords : Wavelet transform, nonlinear analysis, time history analysis, mother wavelet