剧烈的火灾后 ,建筑物中的轻质钢结构会变软。高温会导致在结构垮塌前 ,钢柱弯曲 ,钢梁亦发生弯曲及扭曲现象。室温 (2 0℃ )下很坚固的钢结构在高温下却会软如面条。在大多数建筑发生火灾时的温度下 ,钢尽管不会熔化 ,但的确会变软且不能保留其全部的承载能力。　　强度及硬度 After a violent fire, the lightweight steel structure in the building softens. High temperatures can lead to bending of the steel column and bending and twisting of the steel beam before the structural collapse. Very tough steel structures at room temperature (20 ° C) will be soft as noodles at high temperatures. At the temperatures of most buildings in the event of a fire, the steel does, though not melt, do soften and fail to retain its full load capacity. Strength and hardness