Finite Element Model Updating Of Tibetan Structure And Analysis Of The Relationship Between Deformations

Taking Long-term or even life-cycle real-time monitoring to existing structures in order to getting the performance status of the structure, and predict the structure or component damage degree in order to repair and strengthening the structure in necessary time effectively is an important means to ensure the structures still in good working condition, as well as the ancient timber structure. This paper selects typical Tibetan structure as research object, analysis the structure dynamic characteristics and obtain the dynamic feature paremeters based on the structual dynamic monitoring data, and then take the finite element model updating based on paremeters above-mentioned; analysis the correlation of the static strain data by using the numerical simulation means, and study the deformation features of the components in Tibetan architecture. The major work of the paper includes:(1) Identify the modal parameters of the test structure by means of adopting the integration of Ramdom Decrement Technique and ITD measure using the data of the acceleration test carrying on the typical structure of Tibetan ancient architecture, obtain the structure frequency, damping ratio and mode shapes, make dynamic analysis of the structure;(2) Established the finite element model of the Tibetan structure which is measured, and updating the model using finite element model updating method based on artificial neural networks(ANN), get a more realistic finite element model. It is the necessary basic research for damage identification and reliability assessment of the typical Tibetan structure;(3) Summarizes the deformation features of the typical Tibetan traditional wooden frame structure: excessive deflection of beam, the torsion of component and QueTi's tilt, and study the main factors of generating these deformations. Analyze the correlation of the strain values which extracted from the key points in the structure by using the means of numerical simulation, propose the method of identification and location the deformations based on the static data of strain.