No 2 (2009)

Limiting condition of rod systems is parsed in an elasto-plastic stage and activity coefficients of dangerous sections are defined.

Analysis of joint motion of building structure and crashing missile impacting it is described. The missiles of this kind may be generated by various natural and man induced events. Equations of motion are derived. Example of their application to the problem of successive perforation of several walls by crushing missile is given. It demonstrates that the methodology permits to take into account more accurately distribution of the missile kinetic energy between itself crashing and impacted building structure deformation. The methodology described may be used for safety analysis of nuclear power plants, civil defense and so on structures subjected to destructible large kinetic energy missiles impacts.

In the article, the stability of systems with finite of degrees of freedom is considered at the determined and stochastic action on the example of a suspension bridge. Calculations are executed on two models: the first one describes oscillations of a rigidity beam of the bridge by system of two partial differential equation and the second describes the same oscillations with help of FEM. Influence of parameters of the stochastic excitation on the value of the critical parameter is investigated.