Abdelwahhab KHATIR - Academia.edu (original) (raw)
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Papers by Abdelwahhab KHATIR
Journal of Vibroengineering, 2016
Damage detection and localization in civil engineering constructions using dynamic analysis has b... more Damage detection and localization in civil engineering constructions using dynamic analysis has become an important topic in recent years. This paper presents a methodology based on non-destructive detection, localization and quantification of multiple damages in simple and continuous beams, and a more complex structure, namely two-dimensional frame structure. The proposed methodology makes used of Firefly Algorithm and Genetic Algorithm as optimization tools and the Coordinate Modal Assurance Criterion as an objective function. The results show that the proposed combination of Coordinate Modal Assurance Criterion and Firefly Algorithm or Genetic Algorithm can be easily used to identify multiple local structural damages in complex structures. However, the convergence rate becomes slower for the case of multiple damages compared to the case of single damage. The effect of noise on the algorithm is further investigated. It is found that the proposed technique is able to detect the damage location and its severity with high accuracy in the presence of noise, although the convergence rate became slower than in the case when no noise is present. It is also found that the convergence rate of Firefly Algorithm is much faster than that of Genetic Algorithm.
For continuous steel-concrete composite beam with the slab rests directly on the metal profile, i... more For continuous steel-concrete composite beam with the slab rests directly on the metal profile, in negative moment, an important part of the web is subject to compressive stresses, hence the buckling limiting the ability of rotation of the cross section, thus preventing to reach its ultimate strength. An analytic model calculation, based on a failure mechanism, to evaluate with sufficient precision the rotation capacity to the right of the intermediate support depending on the moment evolution, has been developed by (Tehami 1997) and justified by experimental results of tests carried out by the same author at INSA Rennes (France) and its confrontation with other models proposed in the literature. In the present work we investigated, using a numerical method based on finite element, the proposed model by reference (Tehami 1997) on the local buckling of steel-concrete continuous composite beams. Indeed, and in an effort to learn more about the phenomenon of local buckling of steel-concrete continuous composite beams, a finite element analysis was performed on this model (Tehami 1997) using the ABAQUS code. Then this work focuses on numerical simulation, based on different modeling assumptions in order to obtain moment-rotation relationship. A comparison with previous work found in the literature was made.
Journal of Vibroengineering, 2016
Damage detection and localization in civil engineering constructions using dynamic analysis has b... more Damage detection and localization in civil engineering constructions using dynamic analysis has become an important topic in recent years. This paper presents a methodology based on non-destructive detection, localization and quantification of multiple damages in simple and continuous beams, and a more complex structure, namely two-dimensional frame structure. The proposed methodology makes used of Firefly Algorithm and Genetic Algorithm as optimization tools and the Coordinate Modal Assurance Criterion as an objective function. The results show that the proposed combination of Coordinate Modal Assurance Criterion and Firefly Algorithm or Genetic Algorithm can be easily used to identify multiple local structural damages in complex structures. However, the convergence rate becomes slower for the case of multiple damages compared to the case of single damage. The effect of noise on the algorithm is further investigated. It is found that the proposed technique is able to detect the damage location and its severity with high accuracy in the presence of noise, although the convergence rate became slower than in the case when no noise is present. It is also found that the convergence rate of Firefly Algorithm is much faster than that of Genetic Algorithm.
For continuous steel-concrete composite beam with the slab rests directly on the metal profile, i... more For continuous steel-concrete composite beam with the slab rests directly on the metal profile, in negative moment, an important part of the web is subject to compressive stresses, hence the buckling limiting the ability of rotation of the cross section, thus preventing to reach its ultimate strength. An analytic model calculation, based on a failure mechanism, to evaluate with sufficient precision the rotation capacity to the right of the intermediate support depending on the moment evolution, has been developed by (Tehami 1997) and justified by experimental results of tests carried out by the same author at INSA Rennes (France) and its confrontation with other models proposed in the literature. In the present work we investigated, using a numerical method based on finite element, the proposed model by reference (Tehami 1997) on the local buckling of steel-concrete continuous composite beams. Indeed, and in an effort to learn more about the phenomenon of local buckling of steel-concrete continuous composite beams, a finite element analysis was performed on this model (Tehami 1997) using the ABAQUS code. Then this work focuses on numerical simulation, based on different modeling assumptions in order to obtain moment-rotation relationship. A comparison with previous work found in the literature was made.