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Dynamic Detection of Reinforced Concrete Bridge Damage by Finite Element Model Updating

Journal of Mechanics Engineering and Automation 2014年第1期4卷 40-45页

作者： Mohammed Lamine Moussaoui mohamed chabaat Abderrahmane Kibboua Faculty of Mechanical and Chemical Engineering University of Sciences and Technology Houari Boumedien Faculty of Civil Engineering University of Sciences and Technology Houari Boumediene National Earthquake Engineering Research Center (CGS)

The present work consists of dynamic detection of damages in reinforced concrete bridges by using a MMUM （mathematical model updating method） from incomplete test data. A well suited finite element model of a repaired bridge is carried out. The diagnosis enables us to locate and detect the damage in a reinforced concrete bridge. Thus, developments of analytical predictions have been checked by modal testing techniques. Besides, the FTCS （finite time centered space） scheme is developed to solve the set of equations which can easily handle finite element matrices of a bridge model. It is shown in this study that the method is applied to detect damages as well as existing cracks in real time of a repaired bridge. To check the efficiency of the method, the repaired bridge of OuedOumazer in Algeria has been selected. It is proven that identification methods have been able to detect the exact location of damage areas to be corrected avoiding the inaccuracy from the finite element model for the mass, stiffness and loading.

关键词： Bridges damage detection MMUM finite elements FTCS correlation.

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Relations between J-, M- and N-integrals and Those with Interactions Energy in a Brittle Material

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材料科学与工程（中英文B版） 2012年第2期2卷 192-196页

作者： Mokhtar Touati mohamed chabaat Abdelkrim Chelghoum Built Env. Research Lab. Department of Structures and Materials Civil Eng. Faculty University of Sciences and Technology Houari Boumediene Department of Structures and Materials Civil Eng. Faculty University of Sciences and Technology Houari Boumedi

In this study, kinematics of the Damage Zone (DZ) or the so-called Fracture Process Zone (FPZ) which often precedes the crack during its propagation and characterized by few degrees of freedom (elementary movements) such as translation, rotation, isotropic expansion and distortion are considered. On the basis of a stress field distribution obtained by the use of a Semi-Empirical Approach (SEA), which relies on the Green"s functions, these driving forces corresponding to the mentioned degrees of freedom are formulated within the framework of the plane problem of elastostatics. Thus, expressions for translation (J), isotropic expansion (M), distorsion (N) and interactions effects representing the active parts of crack driving forces known as energy release rates are formulated in a purely theoretical context.

关键词：相互作用脆性材料能源积分各向同性断裂过程区半经验方法能量释放率

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