Changes

The Empire State Building contains steel reinforced by concrete, making it extremely fire-proof.  Deputy Chief Fire Department of New York (F.D.N.Y.) Vincent Dunn (ret.) wrote:<ref>''Id.''</ref>

The Empire State Building contains steel reinforced by concrete, making it extremely fire-proof.  Deputy Chief Fire Department of New York (F.D.N.Y.) Vincent Dunn (ret.) wrote:<ref>''Id.''</ref>

:The more mass the more fire resistance. The best fire resistive building in America is a concrete structure. The structures that limit and confine fires best, and suffer fewer collapses are reinforced concrete pre-WWII buildings such as housing projects and older high rise buildings like the empire state building, The more concrete, the more fire resistance; and the more concrete the less probability of total collapse. The evolution of high- rise construction can be seen, by comparing the empire state building to the WTC.  My estimate is the ratio of concrete to steel in the empire state building is 60/40.  

:The more mass the more fire resistance. The best fire resistive building in America is a concrete structure. The structures that limit and confine fires best, and suffer fewer collapses are reinforced concrete pre-WWII buildings such as housing projects and older high rise buildings like the empire state building, The more concrete, the more fire resistance; and the more concrete the less probability of total collapse. The evolution of high- rise construction can be seen, by comparing the Empire State Building to the [[World Trade Center]].  My estimate is the ratio of concrete to steel in the empire state building is 60/40.  

In 1945, a B-25 bomber crashed into the 79 floor of the Empire State Building in heavy fog, killing 14 persons and igniting a fire.  But there was only $1 million in damage and the structure of the building easily survived the impact and the resultant fire.  Deputy Chief Dunn noted:<ref>''Id.''</ref>

In 1945, a B-25 bomber crashed into the 79 floor of the Empire State Building in heavy fog, killing 14 persons and igniting a fire.  But there was only $1 million in damage and the structure of the building easily survived the impact and the resultant fire.  Deputy Chief Dunn noted:<ref>''Id.''</ref>