Paper Information

Journal:   CIVIL ENGINEERING INFRASTRUCTURES JOURNAL (CEIJ) (JOURNAL OF FACULTY OF ENGINEERING)   JUNE 2016 , Volume 49 , Number 1; Page(s) 165 To 172.
 
Paper: 

DAMAGE DETECTION OF AXIALLY LOADED BEAM: A FREQUENCY-BASED METHOD

 
 
Author(s):  REZAIFAR O.*, DOOST MOHAMMADI M.R.
 
* CIVIL ENGINEERING DEPARTMENT, RESEARCH INSTITUTE OF ADVANCED TECHNOLOGY IN CIVIL ENGINEERING, SEMNAN UNIVERSITY, SEMNAN, IRAN
 
Abstract: 

The present study utilizes an analytical method to formulate the three lowest modal frequencies of axially-loaded notched beam through both crack location and load level in a specific format that can be used in existing frequency-based crack-identification methods. The proposed formula provides a basis to shift into two states, one with axial loading and the other without any loading whatsoever. When any two natural frequencies in simply-supported beam with an open crack, subjected to axial load, are measured, crack position and extent can be determined, using a characteristic equation, which is a function of crack location, sectional flexibility, and eigenvalue (natural frequency). Theoretical results show high accuracy for service axial loads. In this range, errors for crack location and extent are less than 12% and 10%, respectively.

 
Keyword(s): AXIAL LOAD, CHARACTERISTIC EQUATION, DAMAGE DETECTION, EIGEN FREQUENCY, NOTCHED BEAM
 
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