The paper deals with the evaluation of the natural frequencies of vibrations of the modified typical medium-height load-bearing walls modeled as the reinforced concrete thin plates. The small and the large changes of the wall stiffness and mass resulted from the new door-ways size and position were discussed. The Combined Approximations (CA) hybrid method was used as an effective reanalysis approach. Some procedures with using the concepts of shifts and Gram-Schmidt orthogonalizations were introduced to improve the accuracy of the results.
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