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Structural Monitoring and Maintenance
  Volume 5, Number 3, September 2018, pages 345-361
DOI: https://doi.org/10.12989/smm.2018.5.3.345
 
open access

Mode shape identification using response spectrum in experimental modal analysis
Behrouz Babakhani, Hossein Rahami and Reza Karami Mohammadi

 
Abstract
    The set of processes performed to determine the dynamic characteristics of the constructed structures is named experimental modal analysis. Using experimental modal analysis and interpreting its results, structural failure can be assessed and then it would be possible to plan for their repair and maintenance. The purpose of the experimental modal analysis is to determine the resonance frequencies, mode shapes and Mode damping for the structure. Diverse methods for determining the shape of the mode by various researchers have been presented. There are pros and cons for each of these methods. This paper presents a method for determining the mode shape of the structures using the response spectrum in the experimental modal analysis. In the first part, the principles of the proposed method are described. Then, to check the accuracy of the results obtained from the proposed method, single and multiple degrees of freedom models were numerically and experimentally investigated.
 
Key Words
    experimental modal analysis; mode shape; response spectrum; structural dynamics
 
Address
Behrouz Babakhani: Department of Civil Engineering, Arak branch, Islamic Azad University, Arak, Iran
Hossein Rahami: School of Engineering Science, College of Engineering, University of Tehran, Tehran, Iran
Reza Karami Mohammadi: Department of Civil Engineering, K.N. Toosi, University of Technology, Tehran, Iran
 

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