Structural damage detection using a multi-stage improved differential evolution algorithm (Numerical and experimental)

Seyedpoor, Seyed Mohammad,Norouzi, Eshagh,Ghasemi, Sara Techno-Press 2018 Smart Structures and Systems, An International Jou Vol.21 No.2

An efficient method utilizing the multi-stage improved differential evolution algorithm (MSIDEA) as an optimization solver is presented here to detect the multiple-damage of structural systems. Natural frequency changes of a structure are considered as a criterion for damage occurrence. The structural damage detection problem is first transmuted into a standard optimization problem dealing with continuous variables, and then the MSIDEA is utilized to solve the optimization problem for finding the site and severity of structural damage. In order to assess the performance of the proposed method for damage identification, an experimental study and two numerical examples with considering measurement noise are considered. All the results demonstrate the effectiveness of the proposed method for accurately determining the site and severity of multiple-damage. Also, the performance of the MSIDEA for damage detection compared to the standard differential evolution algorithm (DEA) is confirmed by test examples.

Structural damage detection using a multi-stage improved differential evolution algorithm (Numerical and experimental)

Seyed Mohammad Seyedpoor,Eshagh Norouzi,Sara Ghasemi 국제구조공학회 2018 Smart Structures and Systems, An International Jou Vol.21 No.2

An efficient method utilizing the multi-stage improved differential evolution algorithm (MSIDEA) as an optimization solver is presented here to detect the multiple-damage of structural systems. Natural frequency changes of a structure are considered as a criterion for damage occurrence. The structural damage detection problem is first transmuted into a standard optimization problem dealing with continuous variables, and then the MSIDEA is utilized to solve the optimization problem for finding the site and severity of structural damage. In order to assess the performance of the proposed method for damage identification, an experimental study and two numerical examples with considering measurement noise are considered. All the results demonstrate the effectiveness of the proposed method for accurately determining the site and severity of multiple-damage. Also, the performance of the MSIDEA for damage detection compared to the standard differential evolution algorithm (DEA) is confirmed by test examples.

A two-stage damage detection method for truss structures using a modal residual vector based indicator and differential evolution algorithm

Seyed Mohammad Seyedpoor,Maryam Montazer 국제구조공학회 2016 Smart Structures and Systems, An International Jou Vol.17 No.2

A two-stage method for damage detection in truss systems is proposed. In the first stage, a modal residual vector based indicator (MRVBI) is introduced to locate the potentially damaged elements and reduce the damage variables of a truss structure. Then, in the second stage, a differential evolution (DE) based optimization method is implemented to find the actual site and extent of damage in the structure. In order to assess the efficiency of the proposed damage detection method, two numerical examples including a 2D-truss and 3D-truss are considered. Simulation results reveal the high performance of the method for accurately identifying the damage location and severity of trusses with considering the measurement noise.

A new damage detection indicator for beams based on mode shape data

Yazdanpanah, O.,Seyedpoor, S.M.,Bengar, H. Akbarzadeh Techno-Press 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.53 No.4

In this paper, a new damage indicator based on mode shape data is introduced to identify damage in beam structures. In order to construct the indicator proposed, the mode shape, mode shape slope and mode shape curvature of a beam before and after damage are utilized. Mode shape data of the beam are first obtained here using a finite element modeling and then the slope and curvature of mode shape are evaluated via the central finite difference method. In order to assess the robustness of the proposed indicator, two test examples including a simply supported beam and a two-span beam are considered. Numerical results demonstrate that using the proposed indicator, the location of single and multiple damage cases having different characteristics can be accurately determined. Moreover, the indicator shows a better performance when compared with a well-known indicator found in the literature.

An efficient method for structural damage localization based on the concepts of flexibility matrix and strain energy of a structure

Nobahari, Mehdi,Seyedpoor, Seyed Mohammad Techno-Press 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.46 No.2

An efficient method is proposed here to identify multiple damage cases in structural systems using the concepts of flexibility matrix and strain energy of a structure. The flexibility matrix of the structure is accurately estimated from the first few mode shapes and natural frequencies. Then, the change of strain energy of a structural element, due to damage, evaluated by the columnar coefficients of the flexibility matrix is used to construct a damage indicator. This new indicator is named here as flexibility strain energy based index (FSEBI). In order to assess the performance of the proposed method for structural damage detection, two benchmark structures having a number of damage scenarios are considered. Numerical results demonstrate that the method can accurately locate the structural damage induced. It is also revealed that the magnitudes of the FSEBI depend on the damage severity.

Structural damage detection using a damage probability index based on frequency response function and strain energy concept

Bagherahmadi, Seyed Ahdiye,Seyedpoor, Seyed Mohammad Techno-Press 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.67 No.4

In this study, an efficient damage index is proposed to identify multiple damage cases in structural systems using the concepts of frequency response function (FRF) matrix and strain energy of a structure. The index is defined based on the change of strain energy of an element due to damage. For obtaining the strain energy stored in elements, the columnar coefficients of the FRF matrix is used. The new indicator is named here as frequency response function strain energy based index (FRFSEBI). In order to assess the performance of the proposed index for structural damage detection, some benchmark structures having a number of damage scenarios are considered. Numerical results demonstrate that the proposed index even with considering noise can accurately identify the actual location and approximate severity of the damage. In order to demonstrate the high efficiency of the proposed damage index, its performance is also compared with that of the flexibility strain energy based index (FSEBI) provided in the literature.

An efficient method for structural damage localization based on the concepts of flexibility matrix and strain energy of a structure

Mehdi Nobahari,Seyed Mohammad Seyedpoor 국제구조공학회 2013 Structural Engineering and Mechanics, An Int'l Jou Vol.46 No.2

An efficient method is proposed here to identify multiple damage cases in structural systems using the concepts of flexibility matrix and strain energy of a structure. The flexibility matrix of the structure is accurately estimated from the first few mode shapes and natural frequencies. Then, the change of strain energy of a structural element, due to damage, evaluated by the columnar coefficients of the flexibility matrix is used to construct a damage indicator. This new indicator is named here as flexibility strain energy based index (FSEBI). In order to assess the performance of the proposed method for structural damage detection, two benchmark structures having a number of damage scenarios are considered. Numerical results demonstrate that the method can accurately locate the structural damage induced. It is also revealed that the magnitudes of the FSEBI depend on the damage severity.

Comparing the Seismic Behavior of Various Knee Braced Steel Frames Based on Incremental Dynamic Analysis and Development of Fragility Curves

R. Yahyapour,S.M. Seyedpoor 한국강구조학회 2021 International Journal of Steel Structures Vol.21 No.4

The main aim of this study is to assess the seismic behavior of various knee braced steel frames using nonlinear static and dynamic analyses. For this, structures with four diff erent types of knee braces at heights of 5, 10, 15 and 20 stories are designed through ETABS and then are three-dimensionally modeled via PERFORM 3D. Firstly, various seismic parameters including response modifi cation factor, ductility factor, defl ection amplifi cation factor and overstrength factor of the structures are compared via implementing the pushover analysis. Secondly, target models are subjected to fi ve far-fault and fi ve nearfault records. Fragility curves as well as curves obtained from the incremental dynamic analysis (IDA) are then compared, so as to determine the best type of bracing in terms of seismic performance. Benefi ting results of non-linear static analyses, top knee, x-knee, chevron knee and double knee braced frames have the best seismic performance, respectively. Likewise, using IDA results in the far-fault area, x-knee, top knee, chevron knee and double-knee braced frames demonstrate the best performance, respectively. In addition, in near-fi eld area at the height of 5 stories, the best performance is correspondingly attributed to x-knee, top-knee, chevron knee and double knee braces, respectively. However, at heights of 10, 15 and 20 stories, chevron knee, double knee, top knee and x-knee braced frames show a better performance, respectively.

A new damage detection indicator for beams based on mode shape data

O. Yazdanpanah,S.M. Seyedpoor,H. Akbarzadeh Bengar 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.53 No.4

In this paper, a new damage indicator based on mode shape data is introduced to identify damage in beam structures. In order to construct the indicator proposed, the mode shape, mode shape slope and mode shape curvature of a beam before and after damage are utilized. Mode shape data of the beam are first obtained here using a finite element modeling and then the slope and curvature of mode shape are evaluated via the central finite difference method. In order to assess the robustness of the proposed indicator, two test examples including a simply supported beam and a two-span beam are considered. Numerical results demonstrate that using the proposed indicator, the location of single and multiple damage cases having different characteristics can be accurately determined. Moreover, the indicator shows a better performance when compared with a well-known indicator found in the literature.

Structural damage detection using a damage probability index based on frequency response function and strain energy concept

Seyed Ahdiye Bagherahmadi,Seyed Mohammad Seyedpoor 국제구조공학회 2018 Structural Engineering and Mechanics, An Int'l Jou Vol.67 No.4

In this study, an efficient damage index is proposed to identify multiple damage cases in structural systems using the concepts of frequency response function (FRF) matrix and strain energy of a structure. The index is defined based on the change of strain energy of an element due to damage. For obtaining the strain energy stored in elements, the columnar coefficients of the FRF matrix is used. The new indicator is named here as frequency response function strain energy based index (FRFSEBI). In order to assess the performance of the proposed index for structural damage detection, some benchmark structures having a number of damage scenarios are considered. Numerical results demonstrate that the proposed index even with considering noise can accurately identify the actual location and approximate severity of the damage. In order to demonstrate the high efficiency of the proposed damage index, its performance is also compared with that of the flexibility strain energy based index (FSEBI) provided in the literature.