Column structure and base member

Abstract

In a column structure, a steel column having flanges integrally provided at both ends in a width direction of a web is welded to a base plate. Anchor bolts are anchored to a foundation concrete, and the base plate is fixed to the anchor bolts. The distance in the web width direction between the center axial lines of the anchor bolts is equal to or less than the dimension in the web width direction of the steel column.

1 . A column structure comprising:
 a column member that is integrally provided with a flange at each of both sides, in a width direction, of a web;   a base member to which the column member is joined at an upper side thereof; and   a plurality of anchor members, to each of which an anchor portion is attached at a lower end side thereof, each of which is anchored in concrete at the lower end side thereof, and each of which is fixed to the base member at an upper end side thereof, wherein a distance in a web width direction between the plurality of anchor members is equal to or less than a dimension, in the web width direction, of the column member.   
     
     
         2 . The column structure of  claim 1 , wherein the anchor members are disposed at outer sides, in a flange width direction, of the column member. 
     
     
         3 . The column structure of  claim 1 , wherein an indented portion is provided in a lower side face of the base member. 
     
     
         4 . The column structure of  claim 1 , wherein the base member comprises:
 a base portion that is provided at each flange side;   a connection portion that connects together a pair of base portions; and   a cutaway portion that is provided between the pair of base portions.   
     
     
         5 . The column structure of  claim 1 , wherein the base member is provided at each flange side, and a gap is provided between base members. 
     
     
         6 . The column structure of  claim 5 , further comprising a projection portion that is provided at the base member and projects out to a web side of the flange at a lower side of the web. 
     
     
         7 . A base member comprising:
 a base body to which a column member is joined at an upper side thereof, the column member being integrally provided with a flange at each of both sides, in a width direction, of a web; and   a plurality of fixing portions that are provided at the base body, and that are each fixed at an upper end side of an anchor member, to which an anchor portion is attached at a lower end side thereof and which is anchored in concrete at the lower end side thereof, wherein a distance in a web width direction between the plurality of fixing portions is equal to or less than a dimension, in the web width direction, of the column member.   
     
     
         8 . The base member of  claim 7 , wherein the fixing portions are disposed at outer sides, in a flange width direction, of the column member. 
     
     
         9 . The base member of  claim 7 , wherein an indented portion is provided in a lower side face of the base body. 
     
     
         10 . The base member of  claim 7 , wherein the base body comprises:
 a base portion that is provided at each flange side;   a connection portion that connects together a pair of base portions; and   a cutaway portion that is provided between the pair of base portions.   
     
     
         11 . The base member of  claim 7 , wherein the base body is provided at each flange side, and a gap is provided between base bodies. 
     
     
         12 . The base member of  claim 11 , further comprising a projection portion that is provided at the base body and projects out to a web side of the flange at a lower side of the web.