The non-linear behavior of reinforced concrete (RC) beams till the ultimate failure is a complica... more The non-linear behavior of reinforced concrete (RC) beams till the ultimate failure is a complicated phenomenon due to the involvement of heterogenic material properties and cracking behavior of concrete. Behavior prediction of reinforced concrete elements till failure is usually carried out using experimental testing, and the observations are recorded only at critical locations due to restriction in cost of testing equipment and accessories. In order to avoid the destructive testing, reduction of the cost of materials and manpower, the behavior prediction of RC beams is generally carried out using numerical methods. This paper presents study on non-linear flexural behavior of reinforced concrete beams. Non-linear finite element analysis of reinforced concrete beams under flexural loading is presented in this paper. Finite element modelling of reinforced concrete beams is carried out using discrete reinforcement modelling technique. The capability of the model to capture the critica...
Modal-based damage detection methods, have received considerable attention in civil engineering a... more Modal-based damage detection methods, have received considerable attention in civil engineering applications. Damage is identified by comparing the typical dynamic properties of the damage and undamaged structure. In the present work, methods based on modal curvature and modal flexibility differences are employed for identifying and locating honeycomb damage in Reinforced Concrete beam models. In order to verify the suitability for implementing algorithms, eigenvalue analyses are carried out on finite element models of Reinforced Concrete beam and the eigenvectors for different cases are extracted. Damage is considered as a localized reduction in structural stiffness. It is observed that these methods effectively detected the existence of damage and are able to locate the position of damage for single and multiple damage scenarios for beams.
Engineering structures are subjected to various types of environmental exposure conditions and ot... more Engineering structures are subjected to various types of environmental exposure conditions and other loadings during their entire service life. There is a possibility of degradation of their strength and damage in the critical locations. Monitoring their health as well as assessment of the damage and safety evaluation of structures is gaining high importance. In view of locating and quantifying the damage in structures, a two stage methodology is proposed in this paper. Appropriate finite element models of beams are developed. Initially, the modal strain energy based damage indices are evaluated. The normalized mode shapes as well as normalized curvature mode shapes are used for computation of damage indices. Later, the severity of damage is predicted by using Artificial Neural Networks. The performance of modal strain energy based indices is evaluated for various damage cases with different locations and severities. The performance of the proposed method is assessed for cantilever,...
Engineering structures are subjected to various types of environmental exposure conditions and ot... more Engineering structures are subjected to various types of environmental exposure conditions and other loadings during their entire service life. There is a possibility of degradation of their strength and damage in the critical locations. Monitoring their health as well as assessment of the damage and safety evaluation of structures is gaining high importance. In view of locating and quantifying the damage in structures, a two stage methodology is proposed in this paper. Appropriate finite element models of beams are developed. Initially, the modal strain energy based damage indices are evaluated. The normalized mode shapes as well as normalized curvature mode shapes are used for computation of damage indices. Later, the severity of damage is predicted by using Artificial Neural Networks. The performance of modal strain energy based indices is evaluated for various damage cases with different locations and severities. The performance of the proposed method is assessed for cantilever, simply supported and fixed support conditions.
Structural damage identification of beam structures using two stage method based on modal strain ... more Structural damage identification of beam structures using two stage method based on modal strain energy indicators and artificial neural networks Abstract. Engineering structures are subjected to various types of environmental exposure conditions and other loadings during their entire service life. There is a possibility of degradation of their strength and damage in the critical locations. Monitoring their health as well as assessment of the damage and safety evaluation of structures is gaining high importance. In view of locating and quantifying the damage in structures, a two stage methodology is proposed in this paper. Appropriate finite element models of beams are developed. Initially, the modal strain energy based damage indices are evaluated. The normalized mode shapes as well as normalized curvature mode shapes are used for computation of damage indices. Later, the severity of damage is predicted by using Artificial Neural Networks. The performance of modal strain energy based indices is evaluated for various damage cases with different locations and severities. The performance of the proposed method is assessed for cantilever, simply supported and fixed support conditions.. Damage localization and severity evaluation of a beam‑like timber structure based on modal strain energy and flexibility approaches. Journal of Building Appraisal,
The non-linear behavior of reinforced concrete (RC) beams till the ultimate failure is a complica... more The non-linear behavior of reinforced concrete (RC) beams till the ultimate failure is a complicated phenomenon due to the involvement of heterogenic material properties and cracking behavior of concrete. Behavior prediction of reinforced concrete elements till failure is usually carried out using experimental testing, and the observations are recorded only at critical locations due to restriction in cost of testing equipment and accessories. In order to avoid the destructive testing, reduction of the cost of materials and manpower, the behavior prediction of RC beams is generally carried out using numerical methods. This paper presents study on non-linear flexural behavior of reinforced concrete beams. Non-linear finite element analysis of reinforced concrete beams under flexural loading is presented in this paper. Finite element modelling of reinforced concrete beams is carried out using discrete reinforcement modelling technique. The capability of the model to capture the critical crack regions, loads and deflections for various loadings in reinforced concrete beam has been illustrated. Comparison is made between the experimental results and finite element analyses with respect to initial crack formation and the ultimate load capacity of beams. The results obtained in the present study show close agreement with those in the available literature.
In recent years, considerable research has been carried out on the use of mode shape based method... more In recent years, considerable research has been carried out on the use of mode shape based methods to detect structural damage in various types of structures. Damage is identified by comparing the typical dynamic properties of the damage and undamaged structure. In this paper, Modal Flexibility Method and Modal Curvature Method are used to detect crack damage in finite element models of reinforced concrete beams. In order to verify the suitability for implementing algorithms, eigen value analyses are carried out on finite element models of Reinforced Concrete beam and the eigen vectors for different damage cases are extracted. The crack damage is simulated using discontinuing element model method. It is observed that these methods effectively detected the existence of damage and also are able to locate the position of damage for single and multiple damage scenarios for beams.
Structural health monitoring is gaining high importance in conjunction with damage assessment and... more Structural health monitoring is gaining high importance in conjunction with damage assessment and safety evaluation of structures. Vibration based damage identification techniques are global methods that are able to assess the condition of the entire structure at once. These methods are based on the fact that damage in a structure alters dynamic characteristics of the structure. The change is characterized by changes in the eigen parameters that are natural frequency, damping values and the mode shapes associated with each natural frequency. Damage can be identified by comparing the identified dynamic properties of the damage and undamaged structure. Modal-based damage detection methods, have received considerable attention in civil engineering applications. In the present work, method of modal curvature difference is employed for identifying and locating damage in beam models. Damage is considered as a localized reduction in structural stiffness. From the numerical simulations, it is observed that the absolute changes in modal curvature are localized in the region of damage and hence can be used to detect damage in a structure. The method is found successful for detecting and locating the damage in the beam models with different boundary conditions.
Modal-based damage detection methods, have received considerable attention in civil engineering a... more Modal-based damage detection methods, have received considerable attention in civil engineering applications. Damage is identified by comparing the typical dynamic properties of the damage and undamaged structure. In the present work, methods based on modal curvature and modal flexibility differences are employed for identifying and locating honeycomb damage in Reinforced Concrete beam models. In order to verify the suitability for implementing algorithms, eigenvalue analyses are carried out on finite element models of Reinforced Concrete beam and the eigenvectors for different cases are extracted. Damage is considered as a localized reduction in structural stiffness. It is observed that these methods effectively detected the existence of damage and are able to locate the position of damage for single and multiple damage scenarios for beams.
The effect of openings is generally neglected in design of dam but it is considered when openings... more The effect of openings is generally neglected in design of dam but it is considered when openings are large. Large openings create critical zones for tensile stresses in dam. The work reported here comprise of analysis of dam with large openings. The parameters considered are size and shape of large openings. Three models viz without gallery, dam with regular size galleries and dam with large inspection gallery are considered for comparing the effect of the size variation of inspection gallery on dam. The effect of different shapes of galleries like rectangular, square, circular and horse shoe on stresses in dam is studied for various locations. Overall square shaped inspection gallery gives minimum stress around gallery. Due to large openings, there is increase in stresses around the openings and in the dam. Three dimensional finite element analyses are carried out using ANSYS 12.
The non-linear behavior of reinforced concrete (RC) beams till the ultimate failure is a complica... more The non-linear behavior of reinforced concrete (RC) beams till the ultimate failure is a complicated phenomenon due to the involvement of heterogenic material properties and cracking behavior of concrete. Behavior prediction of reinforced concrete elements till failure is usually carried out using experimental testing, and the observations are recorded only at critical locations due to restriction in cost of testing equipment and accessories. In order to avoid the destructive testing, reduction of the cost of materials and manpower, the behavior prediction of RC beams is generally carried out using numerical methods. This paper presents study on non-linear flexural behavior of reinforced concrete beams. Non-linear finite element analysis of reinforced concrete beams under flexural loading is presented in this paper. Finite element modelling of reinforced concrete beams is carried out using discrete reinforcement modelling technique. The capability of the model to capture the critica...
Modal-based damage detection methods, have received considerable attention in civil engineering a... more Modal-based damage detection methods, have received considerable attention in civil engineering applications. Damage is identified by comparing the typical dynamic properties of the damage and undamaged structure. In the present work, methods based on modal curvature and modal flexibility differences are employed for identifying and locating honeycomb damage in Reinforced Concrete beam models. In order to verify the suitability for implementing algorithms, eigenvalue analyses are carried out on finite element models of Reinforced Concrete beam and the eigenvectors for different cases are extracted. Damage is considered as a localized reduction in structural stiffness. It is observed that these methods effectively detected the existence of damage and are able to locate the position of damage for single and multiple damage scenarios for beams.
Engineering structures are subjected to various types of environmental exposure conditions and ot... more Engineering structures are subjected to various types of environmental exposure conditions and other loadings during their entire service life. There is a possibility of degradation of their strength and damage in the critical locations. Monitoring their health as well as assessment of the damage and safety evaluation of structures is gaining high importance. In view of locating and quantifying the damage in structures, a two stage methodology is proposed in this paper. Appropriate finite element models of beams are developed. Initially, the modal strain energy based damage indices are evaluated. The normalized mode shapes as well as normalized curvature mode shapes are used for computation of damage indices. Later, the severity of damage is predicted by using Artificial Neural Networks. The performance of modal strain energy based indices is evaluated for various damage cases with different locations and severities. The performance of the proposed method is assessed for cantilever,...
Engineering structures are subjected to various types of environmental exposure conditions and ot... more Engineering structures are subjected to various types of environmental exposure conditions and other loadings during their entire service life. There is a possibility of degradation of their strength and damage in the critical locations. Monitoring their health as well as assessment of the damage and safety evaluation of structures is gaining high importance. In view of locating and quantifying the damage in structures, a two stage methodology is proposed in this paper. Appropriate finite element models of beams are developed. Initially, the modal strain energy based damage indices are evaluated. The normalized mode shapes as well as normalized curvature mode shapes are used for computation of damage indices. Later, the severity of damage is predicted by using Artificial Neural Networks. The performance of modal strain energy based indices is evaluated for various damage cases with different locations and severities. The performance of the proposed method is assessed for cantilever, simply supported and fixed support conditions.
Structural damage identification of beam structures using two stage method based on modal strain ... more Structural damage identification of beam structures using two stage method based on modal strain energy indicators and artificial neural networks Abstract. Engineering structures are subjected to various types of environmental exposure conditions and other loadings during their entire service life. There is a possibility of degradation of their strength and damage in the critical locations. Monitoring their health as well as assessment of the damage and safety evaluation of structures is gaining high importance. In view of locating and quantifying the damage in structures, a two stage methodology is proposed in this paper. Appropriate finite element models of beams are developed. Initially, the modal strain energy based damage indices are evaluated. The normalized mode shapes as well as normalized curvature mode shapes are used for computation of damage indices. Later, the severity of damage is predicted by using Artificial Neural Networks. The performance of modal strain energy based indices is evaluated for various damage cases with different locations and severities. The performance of the proposed method is assessed for cantilever, simply supported and fixed support conditions.. Damage localization and severity evaluation of a beam‑like timber structure based on modal strain energy and flexibility approaches. Journal of Building Appraisal,
The non-linear behavior of reinforced concrete (RC) beams till the ultimate failure is a complica... more The non-linear behavior of reinforced concrete (RC) beams till the ultimate failure is a complicated phenomenon due to the involvement of heterogenic material properties and cracking behavior of concrete. Behavior prediction of reinforced concrete elements till failure is usually carried out using experimental testing, and the observations are recorded only at critical locations due to restriction in cost of testing equipment and accessories. In order to avoid the destructive testing, reduction of the cost of materials and manpower, the behavior prediction of RC beams is generally carried out using numerical methods. This paper presents study on non-linear flexural behavior of reinforced concrete beams. Non-linear finite element analysis of reinforced concrete beams under flexural loading is presented in this paper. Finite element modelling of reinforced concrete beams is carried out using discrete reinforcement modelling technique. The capability of the model to capture the critical crack regions, loads and deflections for various loadings in reinforced concrete beam has been illustrated. Comparison is made between the experimental results and finite element analyses with respect to initial crack formation and the ultimate load capacity of beams. The results obtained in the present study show close agreement with those in the available literature.
In recent years, considerable research has been carried out on the use of mode shape based method... more In recent years, considerable research has been carried out on the use of mode shape based methods to detect structural damage in various types of structures. Damage is identified by comparing the typical dynamic properties of the damage and undamaged structure. In this paper, Modal Flexibility Method and Modal Curvature Method are used to detect crack damage in finite element models of reinforced concrete beams. In order to verify the suitability for implementing algorithms, eigen value analyses are carried out on finite element models of Reinforced Concrete beam and the eigen vectors for different damage cases are extracted. The crack damage is simulated using discontinuing element model method. It is observed that these methods effectively detected the existence of damage and also are able to locate the position of damage for single and multiple damage scenarios for beams.
Structural health monitoring is gaining high importance in conjunction with damage assessment and... more Structural health monitoring is gaining high importance in conjunction with damage assessment and safety evaluation of structures. Vibration based damage identification techniques are global methods that are able to assess the condition of the entire structure at once. These methods are based on the fact that damage in a structure alters dynamic characteristics of the structure. The change is characterized by changes in the eigen parameters that are natural frequency, damping values and the mode shapes associated with each natural frequency. Damage can be identified by comparing the identified dynamic properties of the damage and undamaged structure. Modal-based damage detection methods, have received considerable attention in civil engineering applications. In the present work, method of modal curvature difference is employed for identifying and locating damage in beam models. Damage is considered as a localized reduction in structural stiffness. From the numerical simulations, it is observed that the absolute changes in modal curvature are localized in the region of damage and hence can be used to detect damage in a structure. The method is found successful for detecting and locating the damage in the beam models with different boundary conditions.
Modal-based damage detection methods, have received considerable attention in civil engineering a... more Modal-based damage detection methods, have received considerable attention in civil engineering applications. Damage is identified by comparing the typical dynamic properties of the damage and undamaged structure. In the present work, methods based on modal curvature and modal flexibility differences are employed for identifying and locating honeycomb damage in Reinforced Concrete beam models. In order to verify the suitability for implementing algorithms, eigenvalue analyses are carried out on finite element models of Reinforced Concrete beam and the eigenvectors for different cases are extracted. Damage is considered as a localized reduction in structural stiffness. It is observed that these methods effectively detected the existence of damage and are able to locate the position of damage for single and multiple damage scenarios for beams.
The effect of openings is generally neglected in design of dam but it is considered when openings... more The effect of openings is generally neglected in design of dam but it is considered when openings are large. Large openings create critical zones for tensile stresses in dam. The work reported here comprise of analysis of dam with large openings. The parameters considered are size and shape of large openings. Three models viz without gallery, dam with regular size galleries and dam with large inspection gallery are considered for comparing the effect of the size variation of inspection gallery on dam. The effect of different shapes of galleries like rectangular, square, circular and horse shoe on stresses in dam is studied for various locations. Overall square shaped inspection gallery gives minimum stress around gallery. Due to large openings, there is increase in stresses around the openings and in the dam. Three dimensional finite element analyses are carried out using ANSYS 12.
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Papers by vb dawari
evaluation of structures is gaining high importance. In view of locating and quantifying the damage in structures, a two stage methodology is proposed in this paper. Appropriate finite element models of beams are developed. Initially, the modal strain energy based damage indices are evaluated. The normalized mode shapes as well as normalized curvature mode shapes are used for computation of damage indices. Later, the severity of damage is predicted by using Artificial Neural Networks. The performance of modal strain energy based
indices is evaluated for various damage cases with different locations and severities. The performance of the proposed method is assessed for cantilever, simply supported and fixed support conditions.
evaluation of structures is gaining high importance. In view of locating and quantifying the damage in structures, a two stage methodology is proposed in this paper. Appropriate finite element models of beams are developed. Initially, the modal strain energy based damage indices are evaluated. The normalized mode shapes as well as normalized curvature mode shapes are used for computation of damage indices. Later, the severity of damage is predicted by using Artificial Neural Networks. The performance of modal strain energy based
indices is evaluated for various damage cases with different locations and severities. The performance of the proposed method is assessed for cantilever, simply supported and fixed support conditions.