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Structural Engineering and Mechanics
  Volume 50, Number 6, June25 2014 , pages 797-816
DOI: https://doi.org/10.12989/sem.2014.50.6.797
 


Dynamic response of layered hyperbolic cooling tower considering the effects of support inclinations
Esmaeil Asadzadeh, Mehtab Alam and Sahebali Asadzadeh

 
Abstract
    Cooling tower is analyzed as an assembly of layered nonlinear shell elements. Geometric representation of the shell is enabled through layered nonlinear shell elements to define the different layers of reinforcements and concrete by considering the material nonlinearity of each layer for the cooling tower shell. Modal analysis using Ritz vector analysis and nonlinear time history analysis by direct integration method have been carried out to study the effects of the inclination of the supporting columns of the cooling tower shell on its dynamic characteristics. The cooling tower is supported by I-type columns and ᴧ-type columns supports having the different inclination angles. Relevant comparisons of the dynamic response of the structural system at the base level (at the junction of the column and shell), throat level and at the top of the tower have been made. Dynamic response of the cooling tower is found to be significantly sensitive to the change of the inclination of the supporting columns. It is also found that the stiffness of the structure system increases with increase in inclination angle of the supporting columns, resulting in decrease of the period of the structural system. The participation of the stiffness of the tower in structural response of the cooling tower is fund to be dependent of the change in the inclination angle and even in the types of the supporting columns.
 
Key Words
    cooling tower; hyperbolic shell; finite element analysis; dynamic response; layered shell; modal analysis; nonlinear time history analysis; support inclination
 
Address
Esmaeil Asadzadeh, Mehtab Alam : Department of Civil Engineering, Jamia Millia Islamia University, 110025 Maulana Mohammed Ali Jauhar Marg, New Delhi, India
Sahebali Asadzadeh : Department of Civil Engineering, Islamic Azad University of Maragheh, Maragheh, Iran
 

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