Column structure
In a column structure, a base member is fixed onto a foundation by mortar, serving as a fixing member. First and second anchor bolts are employed as anchor members for fixing the base member. A steel column, serving as a column member in which flanges are integrally formed at both sides in a width direction of a web, is joined to the upper side of the base member. A shear resistance member is provided to a lower portion of the web, so as to be buried at least in the mortar. The shear strength of the column structure is raised by the shear resistance member.
1. A column structure placed on a foundation, the column structure comprising:
a column member having a web and flanges that are integrally provided at both sides, in a width direction, of the web;
a base member having an upper side that is joined to the column member;
an anchor member having a lower end side that is fixed to the foundation, and an upper end side to which the base member is fixed;
a fixing member that is disposed between the foundation and the base member; and
a shear resistance member that is disposed at a lower portion of the web, that extends past the base member at least into the fixing member, and that increases the shear resistance of the column member at least with respect to the fixing member.
2. The column structure of claim 1 , wherein:
the shear resistance member is integrally formed with the lower portion of the web with the length direction of the shear resistance member oriented in the width direction of the web.
3. The column structure of claim 1 , wherein:
second shear resistance members are joined to the lower portion of the web, and are buried at least in the fixing member.
4. The column structure of claim 3 , wherein:
the second shear resistance members comprise plates that are joined to the lower portion of the web, and that have a length direction oriented in the width direction of the flanges.
5. The column structure of claim 1 , wherein:
the base member includes a first base member having a first upper side to which one of the flanges is joined, and a second base member that is separated from the first base member and that has a second upper side to which the other of the flanges is joined; and
the shear resistance member is disposed between the first base member and the second base member.
6. The column structure of claim 1 , wherein:
the shear resistance member is buried only in the fixing member.
7. The column structure of claim 6 , wherein:
indentation and protrusion portions are provided on an upper face portion of the foundation, and the fixing member is provided so as to cover the indentation and protrusion portions of the upper face portion of the foundation.
8. The column structure of claim 1 , wherein:
the shear resistance member is buried in the fixing member and in the foundation.
9. The column structure of claim 1 , wherein:
a pass-through portion extends completely through from a surface of the upper side of the base member to a surface of a lower side of the base member, and the shear resistance member extends through the pass-through portion at least into the fixing member.