DETERMINATION OF THE POST-FIRE TECHNICAL CONDITION OF FLOOR STRUCTURES OF RESIDENTIAL BUILDINGS TO ENSURE THEIR RELIABILITY
DOI:
https://doi.org/10.31713/budres.v0i42.023Abstract
The studies of the state of reinforced concrete prefabricated floor slabs after the impact of the fire are analyzed on the example of two objects in Lviv. The initial data was obtained and performed in the process of an instrumental survey. The cases of the post-fire state of various typical constructions of floor slabs presented in the work show that their behaviour patterns adopted and applied during their calculation and design differ significantly from their actual state.
The resulting post-fire factual deflections of Dact differ significantly from the limit deflections fu, accepted for normal operating conditions of residential and other premises, which, in cases of exceeding the actual deflections of Dact, requires making decisions on strengthening or replacing the floor slabs.
In most cases, a post-fire inspection of floor slabs takes place in rooms with uncomfortable conditions, which requires quick data collection for their further processing and determination of technical conditions according to limit states and verification calculations for making recommendations for increasing their bearing capacity or dismantling.
Therefore, it is necessary (and suggested) to, first of all, determine the places where high-temperature influences have maximally affected the floor slabs, however, it is practically impossible to visually determine this on a large area of premises. A measurement methodology using a laser rotary level is proposed, using which even one specialist can determine the areas and the level of the greatest damage in the inspected slabs of the floor.
Variants of constructive measures for strengthening the elements of the floor slabs for the two studied objects are presented.