Abstract
The paper deals with the issues of destructure modeling for constructive systems of reinforced concrete framing buildings. It is considered the widely using in practice framework of interspecific appliance for multi-storey buildings and structures on the basis of protection against progressive collapse. The results of dynamic additional loading analysis for girders of considering reinforced concrete framework at sudden structural transformation of constructive system are presented. It is obtained that at accidental impact and fragile destruction of tensiled concrete the coefficient of dynamic increasing of internal forces in tensiled reinforcement of reinforced concrete elements depends on the percent of reinforcement in cross section, prestressing level and topology of structure. It is proposed to calculate without of structural dynamic methods on the energetic basis the coefficient of dynamic increasing of internal forces in structures at sudden removal of a bearing element and cracking.
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