Main tower for bridge and bridge provided therewith

Abstract

An object is to provide a main tower of a bridge having a rectangle-shaped cross section which can effectively reduce oscillation for wind blowing in the direction normal to the bridge axis. A cross sectional shape of a tower column is a rectangle shape with a direction normal to the bridge axis dimension smaller than a bridge-axis direction dimension. A slit passing through in the direction normal to the bridge axis is formed in a substantially central position, and a ratio of the bridge-axis direction dimension of the slit with respect to the bridge-axis direction dimension of the cross section is between 0.2 and 0.3.

1 . A main tower of a bridge where a cross sectional shape of a tower column is a rectangle shape with a direction normal to the bridge axis dimension smaller than a bridge-axis direction dimension, wherein a slit passing through in said direction normal to the bridge axis is formed in a substantially central position, and a ratio of said bridge-axis direction dimension of said slit with respect to said bridge-axis direction dimension of said cross section is between 0.2 and 0.3.  
   
   
       2 . A main tower of a bridge according to  claim 1 , wherein a viscoelastic member is arranged in said slit.  
   
   
       3 . A bridge provided with a main tower of a bridge according to  claim 1 .  
   
   
       4 . A main tower of a bridge where an envelope shape of a tower column cross section is a rectangle shape with a direction normal to the bridge axis dimension smaller than a bridge-axis direction dimension; wherein 
 a slit passing through in said direction normal to the bridge axis is formed in a substantially central position;    in four corners of said envelope shape, is formed cutout parts with a cut out section which is cut out from a bridge-axis direction cutout position positioned on one side in the bridge-axis direction, to a direction normal to the bridge axis cutout position positioned on an other side in the direction normal to the bridge axis that is orthogonal to said one side, and    a bridge-axis direction cutout dimension from a corner part of said envelope shape to said bridge-axis direction cutout position is greater than a direction normal to the bridge axis cutout dimension from said corner part to said direction normal to the bridge axis cutout position.    
   
   
       5 . A main tower of a bridge according to  claim 4 , wherein a ratio of said bridge-axis direction dimension of said slit with respect to said bridge-axis direction dimension of said cross section is between 0.2 and 0.3.  
   
   
       6 . A main tower of a bridge according to  claim 4 , wherein a viscoelastic member is arranged in said slit.  
   
   
       7 . A bridge provided with a main tower of a bridge according to  claim 4 .  
   
   
       8 . A main tower of a bridge where a cross section is a rectangle shape with a direction normal to the bridge axis dimension smaller than a bridge-axis direction dimension, wherein 
 a slit passing through in said direction normal to the bridge axis is formed in a substantially central position, and    a slit passing through in said bridge-axis direction is formed in a substantially central position.    
   
   
       9 . A main tower of a bridge according to  claim 8 , wherein a viscoelastic member is arranged in said slit.  
   
   
       10 . A bridge provided with a main tower of a bridge according to  claim 8.