The cause of steel houses collapsing very quickly in a fire

Houses made of corrugated steel frame can reduce durability and collapse after 15 minutes due to high fire causing heat stress.

The loft and the corrugated iron roof collapsed when the fire caused the victims in the candy factory in Hoai Duc, Hanoi to escape.(Photo: Giang Huy).

Steel frames in buildings can collapse quickly due to heat due to heat , according to Springer. Although there is little impact on steel structure under normal conditions, the heat because heat becomes a major factor reduces the fire resistance of steel when there is fire.

Storming due to heat occurs when the temperature exceeds 450 degrees Celsius, causing deformed steel, especially at joints. Distortion increases with time even when the temperature does not change. In the confectionery factory, porous materials, plastic, and insulation can cause fires to erupt violently, creating very high temperatures.

The viability of a structure using steel frames in the fire depends on the melting temperature of the steel used. From a temperature of 300 degrees Celsius, steel begins to lose strength. Different types of steels have different speed reductions.

Steel though often withstands high temperatures but constituent elements may be weakened when exposed to heat. Heavy objects can therefore cause steel to bend, twist until it breaks. The roof is supported by a steel frame that can suddenly fall down, sealing the escape route of the victims, causing tragedy.