Effect of Earthquake Frequency Content on Torsional Responses of Reinforced Concrete Framed Structure
Vinay S1, Purushotham G Sarvade2, Vijayalaxmi I.K3
1Vinay S, PG Student, Department of Civil Engineering, Manipal Institute of Technology, Manipal, Udupi, India.
2Dr. Purushotham G Sarvade, Professor, Department of civil Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Udupi, India.
3Vijayalaxmi I. K, Design Manager, Semac Consultants Pvt. Ltd Bangalore, India.
Manuscript received on 05 April 2019 | Revised Manuscript received on 13 May 2019 | Manuscript published on 30 May 2019 | PP: 1040-1044 | Volume-8 Issue-1, May 2019 | Retrieval Number: A1168058119/19©BEIESP
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Abstract: An Earthquake is vibration of earth’s surface due to sudden release of energy from earth crust. Earthquakes not only have social consequences of causing injury and death to living things but also has economic consequences of damaging the natural and built environment. So, it is significant to study the dynamic characteristics of ground motions. The objective of this research work is to study the torsional behavior of the six storey regular and irregular buildings when bi-directional earthquake excitation is also considered in the direction other than along principle axes of the building. Ground motions considered are having three different frequency contents like low frequency, intermediate frequency and high frequency content. Angle of incidence of earthquake excitation is varied with respect to X and Y axis respectively from 0° to 360° with an increment of 30°. Scaling of ground records are done using Seismosignal software. Linear modal time history analysis is done in the ETABS-2016 software. The torsional rotation of the building models is studied and compared. It is concluded that critical angle of incidence of earthquake excitation causing maximum responses may not always occur along principle axes of the building. Practically this research work gives idea about torsional behavior of regular and irregular buildings under varying frequency content and it also helps to know which frequency content results more torsion in the building.
Keywords: Peak Ground Acceleration (PGA), Frequency Content, Linear Time History Analysis, Ground Motions.

Scope of the Article: Earthquake Engineering