Modal Analysis of Hyperboloidal Shell Structures

Volume 9 Issue 2 March - May 2019

Research Paper

Modal Analysis of Hyperboloidal Shell Structures

A. Kavya Reddy*, B. D. V. Chandra Mohan Rao**

* Department of Civil Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, Telangana, India.

** Professor, Department of Civil Engineering, VNR Vignana Jyothi Institute of Engineering and Technology, Hyderabad, Telangana, India.

Reddy, A. K., & Rao, B. D. V. C. M. (2019). Modal Analysis of Hyperboloidal Shell Structures, i-manager's Journal on Civil Engineering, 9(2), 55-61. https://doi.org/10.26634/jce.9.2.16148

Abstract

Hyperboloidal shell structures have applications like cooling towers in thermal power plants. These types of structures have complex geometry and may lead to the failure because of its imperfections in geometry, when subjected to horizontal loads. Geometrical optimization of such structures leads to minimum stresses and deflections and finds out best possible load bearing behavior. This paper deals with the modal analysis of hyperboloidal shell structures of two different heights (143.5 m and 175.5 m). The hyperboloidal shells are modelled by varying height to top diameter ratio (1.5, 1.75, 2.0, 2.25, 2.5) and height to bottom diameter ratio (1.3, 1.35, 1.4, 1.45, 1.5). Free vibration analysis has been carried out for all the models described above to obtain the fundamental natural time periods / frequencies and mode shapes. This analysis has been carried out using ANSYS and finally, some useful conclusions are drawn.