OPTIMIZATION OF THE TALL BUILDINGS STRUCTURAL SYSTEM FOR RELIABILITY AGAINST PROGRESSIVE COLLAPSE

摘要

Structures should be designed exploiting all their resources in order to counter accidental actions.For complex structures, the consequences of such actions can be very serious and therefore they should be limited.In particular, actions, such as fire, can determine local or global collapse.This paper is focused on the progressive collapse susceptibility that depends on the structural system organization.The attention is focused especially on the role of vertical bracing systems and the outrigger.The location of these systems could be optimized in order to ensure the best possible performance to the structural system.In relation to a steel high-rise building, the investigations take into account a full nonlinear response of the structure.A spatial model has been implemented, capable of highlighting possible out of plane displacements of the elements in a commercial finite element code.Investigations carried out on substructures have highlighted the effectiveness of different structural solutions.