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Re: Plane impact design

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The twin trade center towers in NYC were designed for impact of a 707 or

-----Original Message-----
From: Patrick F. Quinn <quinnair(--nospam--at)>
To: seaint(--nospam--at) <seaint(--nospam--at)>
Date: Thursday, July 08, 1999 8:39 AM
Subject: Re: Plane impact design

>It was a B-25. It made a big hole from the photos I saw, but didn't seem to
>do any major structural systems damage.   I would think that there could be
>no standard for a collision.  Different airplanes have different mass,
>different rates and modes of deformation,  are moving at different
>velocities, and could not be expected to strike at the same angle of
>approach (vertical or horizontal angle).  Remember that the force is
>equivalent to the rate of change of momentum.  It seems that this would be
>an unlikely load in any rational siting of a structure.
>Pat Quinn
>Henderson, Nevada
>----- Original Message -----
>From: Roger Turk <73527.1356(--nospam--at)>
>To: <seaint(--nospam--at)>
>Sent: Wednesday, July 07, 1999 8:59 PM
>Subject: Plane impact design
>> Rodrigo Lema wrote:
>> . > Does anyone know of a good source on the analysis of a structure to
>> . > airplane impact loads?
>> There must be a paper somewhere on the Empire State Building.  In 1946, a
>> B-24 (?) flying in a fog plowed into the 84th (?) floor of the Empire
>> Building.  Still remember seeing the picture of the tail of the plane
>> sticking out of the building.
>> A. Roger Turk, P.E.(Structural)
>> Tucson, Arizona