Probabilistic Analysis of Dynamic Response of Structures with Considering the Uncertainty in Input Excitation

This thesis attempts to study probabilistic analysis of dynamic responses of structures with considering of uncertainty in input excitation. According to building design codes for design structures with irregularities in plan and elevation dynamic analysis must have been performed prior to structural design. One of the proposed methods for dynamic analysis of structures is time history analysis that in this, ground motions are being selected accordance to the code base methods apply to structure in the base elevation. According to random nature of input accelerations the results of analysis are no longer deterministic and become probabilistic. Therfore in this study structures with 5 and 10 stories considered and actual ground motions in tree sets such as BHRC records, European records and 20 chosen records from most strongest in the world applied to them. Selection and scaling of records and applying them on structures have been done by using base code methods. Also with assumption of shortage in quantity of actual ground motions for probabilistic analysis, the artificial spectrum compatible ground motions generated by using wavelet theory and based on iterative process. Then dispersion of results such as drift ratio, lateral displacement and floor shears under application of actual and artificial records discussed. The results show that the distribution of responses depens on the records set, structural characteristics, selection procedures and records scaling. Dispersion of responses could have differente values. if the responses reduce in ratio of static base shear to dynamic base shear, dispersions decrease and if structures subjected on artificial spectrum compatible ground motions, dispersions are minimized. Keywords: uncertainty, probabilistic analysis, artificial earthquake motions, wavelet theory, time history analysis