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World Trade Center 

The project consisted of two 110-story twin towers.  When originally constructed, the 417 meter  tall towers were the world’s tallest buildings. 


A listing of the innovations incorporated into the World Trade Center is over long.  Still, listing just a few of the ideas and innovations conceived and developed by LERA:


- The tubular framing system for the perimeter wallresisting all of the lateral forces imposed on  the building;

- The introduction of the outrigger system;  structurally linking the outside wall to the services core;

- The prefabrication in structural steel to a degree

 never before achieved;

- The use of the boundary-layer wind tunnel for predicting both steady-state and dynamic forces on structure and on glazing, and for developing the dynamic component of wind-induced structure motion;

- Motion-simulators to determine acceptable levels of wind-induced structure motion;

- The viscoelastic damping system, effectively dissipating the dynamic component of building motion;

- The development of a theory to predict the breakage rate of glass under the dynamic forces of the wind;

- The development of a theory to predict stack action and both temperature- and wind-induced airflow within a high-rise building;

- The first structure outside of the military and the nuclear industries designed to resist the impact of a jet airliner;

- The concept of the fire-rated shaft Wall partition system, which partition has replaced masonry and plaster walls… at the time the standard enclosure for elevators, stairs, duct shafts and the like.





New York, NY 



The Port Authority of New York & New Jersey 



Minoru Yamasaki Associates


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