Behavior of the core-suspended building in case of local collapse of structural elements

Introduction. The core-suspended system was first used in the construction of high-rise buildings in the 1960s. This system was developed with the aim of rational use of urban space in conditions of dense buildings. It has become widespread around the world. In addition to their architectural advantages, core-suspended buildings have a number of important design features such as the increased flexibility of their load-bearing elements. This can be used to reduce the forces that occur in structures under various dynamic influences. At the same time, the construction and exploitation of buildings of the core-suspended type have technical difficulties. An emergency failure of critical load-bearing elements, such as suspensions or walls of the core of rigidity, in buildings of this type can lead to an avalanche-like collapse of other structures. Special attention should be paid to ensuring the resistance of trunk-suspended buildings to progressive collapse. Aim. To analyze the susceptibility of a multi-storey suspended building to progressive collapse. Materials and methods. In the LIRA software package, numerical modeling of a building with a core-suspended load-bearing system was carried out when the accidental failure of most critical load-bearing elements was occured. This allowed an analysis of the building's resistance to progressive collapse. Results. Data on the stress-strain state of load-bearing elements during local structural failure have been obtained. Conclusions. The core-suspended building is not susceptible to progressive collapse. This is confirmed by data on the behavior of the building in calculations corresponding to various local structural failures.