RESPONSE SENSITIVITY OF THE STRUCTURE USING VIBRATION BASED DAMAGE DETECTION TECHNIQUES

Pooja K, Siddesha H, Manjunath N Hegde

Abstract: Many developments have been carried out in order to try to quantify the effects produced by damage and the vibration based methods of damage diagnostics are proved to be promising. In the present study, a two storey one bay steel portal frame with cross bracing is considered as an undamaged case. The damage is introduced to the frame by removing the bracing at various levels. The modal parameters of the undamaged and damaged frames were extracted by using FEM software ANSYS 14.5 and validated through experimental results performed using mini shake table. The Frequency response function (FRF) plot is drawn from the experimental results. Further the damage is introduced to the frame by reducing the young’s modulus, reducing the cross sectional area and increasing the temperature due to fire in bracing and at each floor is also studied by using ANSYS 14.5 by performing the modal analysis. The results show that the natural frequencies for the damaged structure decreases and the amplitude increases

Keywords: steel frame structure, damage detection, sensitivity analysis, Dynamic response, fire temperature

DOI: https://doi.org/10.15623/ijret.2013.0213012