Free Vibration Analysis of Steel Framed Structures

Document Type : Research Note


1 Department of Civil Engineering, Pabna University of Science and Technology,Pabna-6600, Bangladesh

2 Civil engineering, Rajshahi University of Engineering & Technology, Rajshahi-6204, Bangladesh

3 Civil Engineering, Rajshahi University of Engineering & Technology, Rajshahi-6204, Bangladesh

4 Civil Engineering, Rajshahi University of Engineering & Technology, Rajshai-6204, Bangladesh


This study based on free vibration analysis and study the behavior of framed structure under different frequency of vibration using ANSYS software and shaking table. A small scale uni-axial shaking table was prepared in laboratory, which can produce lower to moderate vibration, regarding frequency and velocity. Moment resisting framed structures constructed with connecting beam and column elements of mild steel wire of different dimensions were tested in shaking table and analyzed using ANSYS software. The effect of masses and stiffness of structures on its natural frequency and deflection under certain ground vibration also studied and discussed. The test results showed that, this shaking table is satisfying the general concept of free vibration. The height of structures has an inverse effect on its natural frequency for same lateral stiffness. After several shaking, structure’s natural frequency started to decreases with their decreasing stiffness. Therefore, the fabricated shaking table can used in free vibration analysis.


Main Subjects

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