Software implementation of assessment of buildings' resistance to progressive collapse

Maiboroda Roman

National University of Civil Protection of Ukraine

http://orcid.org/0000-0002-3461-2959

Otrosh Yurii

National University of Civil Protection of Ukraine

http://orcid.org/0000-0003-0698-2888

DOI: https://doi.org/10.52363/2524-0226-2025-41-12

Keywords: progressive collapse, fire, explosion, LIRA–SAPR, computer model, load combination

Аnnotation

A computer model has been developed that allows assessing the resistance of a reinforced concrete monolithic building to progressive collapse under the influence of the combined action of fire and internal deflagration explosion. For this purpose, a spatial physically and geometrically nonlinear model of a six-story industrial building was created. The model takes into account the combined operation of load-bearing structures, changes in the thermophysical and mechanical properties of materials under the influence of elevated temperatures, the formation of local destruction, redistribution of internal forces and dynamic effects from explosive loading. The model is implemented in the LIRA-SAPR software package using the “thermal conductivity” module to take into account the temperature effect of a standard fire regime lasting 60 minutes and the “dynamics in time” settings to simulate an impulse load from an explosion of 15 kPa. As a result of the modeling, it was established that the isolated action of a fire leads to an increase in the deflections of the floor slabs by 2.6 times, and an internal explosion leads to an increase in the deflection of the bottom slab by 5.2 times relative to the normal state. The greatest danger is the scenario of the combined impact of fire and explosion, in which the deflection of the lower plate reached 55.8 mm, which exceeds the initial value by 8.3 times. Such deformations, when combined, can potentially cause the loss of the load-bearing capacity of structures and the development of progressive collapse of the building. The results obtained form the basis for increasing the level of structural safety of buildings and reducing the risk of loss of human lives in emergency situations. The proposed approach provides the possibility of a comprehensive assessment of the resistance of reinforced concrete monolithic buildings to progressive collapse under the combined action of thermal and explosive loads, as well as the justification and implementation of effective measures to increase their reliability and survivability.

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