Vista Tower Getting ‘Blow-Through’ Floor To Reduce Swaying In Wind


35 MINUTES INBOUND ON STEVENSON . SOUTH ON THE EXPRESSWAYS, IT LOOKS GOOD. THE SITE WAS MEANT TO MOVE YOU. IT MAY MOVE TOO MUCH. WE TRAVELED TO RIVER EAST WITH A TOWER RISING HIGH THROUGH THE WINDS OF CHANGE. Reporter: RISING 93 STORIES ABOUT THE CITY, THE VISTA TOWER LOOKS LESS LIKE A SKELETON AND MORE LIKE THE THIRD TALLEST BUILDING IN CHICAGO. BEFORE IT IS COMPLETE, WE WANT TO POINT OUT ONE FLOOR IN PARTICULAR. FROM THE GROUND, IT LOOKS DIFFERENT. IT IS UNIQUE TO THE CITY. THERE ARE 10 FLOORS OF UNITS ABOVE US. Reporter: THE VIEWS ARE SPECTACULAR. IT IS NOT WHAT WE ARE HERE FOR. IT IS THE BLOW THROUGH FLOOR. THE 83rd FLOOR. Reporter: LIKE THE NAME IMPLIES, THE BLOW THROUGH FLOOR WILL REMAIN MOSTLY OPEN. ALLOWING WINDS TO BLOW THROUGH AND KEEP THE TOWERS FROM SWAYING TOO MUCH. A BLOW THROUGH FLOOR IS AWAY , AS THE STRUCTURAL ENGINEERS EXPLAINED, CONFUSE THE WINDS. Reporter: THE NEED FOR A BLOW THROUGH FLOOR WAS DISCOVERED AFTER CONSTRUCTION BEGAN. WHEN THE MODEL OF THE ELEGANT STRUCTURE WAS PLACED IN A WIND TUNNEL FOR ANALYSIS. A 23 VERTICAL GREAT WILL BE SPACED OUT AROUND THE PERIMETER. MATCHING THE WINDOW COLORS. Reporter: WINDS ARE PASSING THROUGH THE FLOOR AT 35 MILES PER HOUR. YOU CAN FEEL THEM. IT HAS TO DO WITH THE WAY THE FLOOR WAS DESIGNED. IT ENCOURAGES THE WINDS TO COME THIS WAY AND PASS THROUGH. IF YOU WANT TO GET TECHNICAL, IT REDUCES THE ACCELERATION. THE WHIP FACTOR OF THE MOVEMENT. Reporter: THE VISTAS BLOW THROUGH FLOOR IS THE FIRST FOR CHICAGO. YOU CAN FIND A HOLE 515 NORTH STATE. IT IS ANESTHETIC. THE COUNCIL REMINDS US MOST OF THE TOLD STRUCTURES LIKE WILLIS, SWAY SEVERAL INCHES EACH DAY. WHATEVER DIRECTION THE WINDS COMES FROM , WE CAN ALLEVIATE THE PRESSURE. Reporter: IN THE WINDY CITY, THEY ARE PREPARED 93 STORIES TALL. AND LAKESHORE EAST, VINCE GERASOLE . CREATING A BLOW THROUGH

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