The main issue for building structures is to ensure its integrity. This is to some extent ensured by the study of wave processes in building structures using mathematical modelling and the identification of model parameters that guarantee the reliability of such structures. The article continues the study of wave processes in elastic beams on the basis of nonlinear differential equations previously published by the authors, in which the existence and uniqueness theorem was proved. At the same time, a feature of the nonlinear differential equation, a movable singular point, was associated with the location of the destruction of the structure. This paper presents a theoretical substantiation of the influence of the disturbance of a moving singular point on the structure of the analytical approximate solution. A priori estimates are obtained and numerical experiments are carried out, confirming the theoretical propositions.