Damage Detection Based On The Difference Of The Curvature Mode For The Plates

Most of the engineering structures, when subjected to the natural disasters such as earthquake and fire or the action of the long-term fatigue loading and erosion, will often induce the damage of the structure. With the accumulation of the damage, its criticality will be gradually enhanced. The real time repair can be done and the means of the operation can be changed with the help of the judgment of the structure damage and the confirmation of the locality of the damage, so as to degrade the accumulation degree of the damage of the structure and reduce the economy loss.Consequently great attention is given to the diagnosis technique of the damage of the structure in the architecture industry domestic and abroad. But as a new study field, its development is incomplete. In this paper, the methods of the damage identification which are based on the difference of the curvature mode for the plates are brought forward.Firstly, the development of the damage identification technique of domestic and abroad is introduced. The classification of all kinds of damage identification methods which are usually adopted at present is simply introduced. The problems and the improvement of the methods of the damage identification are discussed.Secondly, the theories of the method of structure damage identification which are based on the difference of the curvature mode are summarized. The rationale of the method which is adopted to carry out the structure damage identification is presented. And the definition and the numerical analysis methods of the damage identification which are based on the difference of the curvature mode are presented.Thirdly, the clamped slab and the simply supported slab are taken as the study objects. The structural damage is simulated by changing the elastic modulus of elements. In this paper, the method of the damage identification which is based on the difference of the curvature mode is used. By analysis, the location of the structure damage can be identified exactly by using the method of the difference of the curvature mode because only the difference of the curvature mode of the damage element changed obviously. But the degree of the damage can not be identified by this method and must be generally determined by other methods.Finally, a non-standard ANSYS analysis module is created by using User Interface Design Language (UIDL) and ANSYS Parameter Design Language (APDL) at standard ANSYS version based on self-need because we all know that the ANSYS software has the excellence of the nice property of opening and its property of customization. So the use accessibility and the high effectiveness can be realized in the process of design and analysis.