JP2018178587A - Building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a building capable of highly evaluating the rotational rigidity of steel column pedestals.SOLUTION: The building of the present invention comprises a foundation steel frame 3 tightened to a foundation 2 by anchor bolts and extending along the outer periphery in a mutually connected state and a plurality of steel columns 4 welded and joined to the upper surface of the foundation steel frame 3. A steel beam 7 extending along the outer periphery is rigidly joined to the upper part of the steel column 4 and an orthogonal beam 8 extending toward the inside of the building is pin-joined to the steel column 4 or the steel beam 7.SELECTED DRAWING: Figure 1

Description

  The present invention relates to, for example, a building having a steel column base.

  Conventionally, an exposed column base (exposed fixed column base) is known as a general column base structure (refer to Patent Document 1).

Japanese Patent Application Laid-Open No. 10-25808

  By the way, for example, when steel columns are arranged in a columnar column at fine pitches, when the steel columns are provided in an exposed column type, the rigidity in the column direction (column direction) allows only rotational rigidity due to the specifications of the anchor bolt. There is no need to increase the load resistance even if the number of columns is increased.

  The present invention has been made in consideration of the above-mentioned matters, and an object thereof is to provide a building capable of highly evaluating the rotational rigidity of a steel column base.

  In order to achieve the above object, a building according to the present invention comprises a base steel frame which is fastened to a base by anchor bolts and extends along an outer periphery in a mutually connected state, and a plurality of weld joints on the upper surface of the base steel frame. And a steel column (claim 1).

  In the above building, a steel frame beam extending along the outer periphery is rigidly connected to the upper portion of the steel frame column, and an orthogonal beam extending toward the inside of the building is pin-bonded to the steel frame column or the steel frame beam Good (claim 2).

  In the above-described building, the base steel frames may be pin-connected to each other at a location where the base steel frames having the same length and welded to each other are welded to the center of the beam span.

  The present invention provides a building capable of highly evaluating the rotational rigidity of a steel column base.

  That is, in the building of the invention according to each claim of the present application, since the base steel frame is arranged along the outer periphery of the building and the steel frame column is welded thereon, the rotational rigidity by the anchor bolt specifications for fixing the base steel frame is k1. Assuming that the rotational rigidity of the base steel frame is k2, the rotational rigidity of the column base structure of this example can be the rigidity of the series sum of the rotational rigidity k1 and k2. Therefore, the rotational stiffness K can be evaluated higher than the rotational stiffness k1 of the conventional exposed column base according to the same specifications of the anchor bolt.

  Further, in the building of the present invention, the configuration of welding the steel frame column to the base steel frame can increase the degree of freedom in arranging the steel frame column.

  In the building according to the second aspect of the present invention, bending stress in the out-of-plane direction can be obtained by constructing a one-way rigid frame structure with steel beams, steel columns, and base steel frames and making orthogonal beams extending through the rigid frame structures into pin joints. Since it can be made not to generate, reduction in section of the steel frame column can be realized.

  In the building according to the third aspect of the present invention, the joint work of the base steel frames can be simplified by performing the pin joint at the place where the bending moment is not generated.

BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows roughly the structure of the foundation of a building, and a steel frame based on one embodiment of this invention. (A) and (B) are a cross-sectional view and a longitudinal cross-sectional view which show the structure of the principal part of the said building roughly, (C) is a longitudinal cross-sectional view when cut by the plane orthogonal to (B) It is. (A) is an explanatory view schematically showing the method of connecting the base steel frame in the building, (B) and (C) are explanatory views schematically showing the configuration of one example and another example of the connection portion of the base steel frame . It is explanatory drawing which shows roughly the structure of the modification of the fixing method of the base steel frame in the said building.

  Embodiments of the present invention will be described below with reference to the drawings.

  The building according to the present embodiment is a steel-frame building having a base and a steel frame as shown in FIG. 1, which is fastened to the base 2 by anchor bolts 1 (see FIGS. 2B and 2C). The base steel frame 3 extending along the outer periphery of the building in a state of being connected to one another (a state of being connected to one another) and a plurality of steel frame columns 4 welded to the upper surface of the base steel frame 3 (FIG. 3 (A) reference).

  The foundation 2 is provided along the outer periphery of the building as shown in FIG.

  The base steel frame 3 is configured using an H-shaped steel, and as shown in FIGS. 2A to 2C, the support plate 5 extending over the upper and lower flanges 3b and 3c is suitably provided on both sides of the web 3a. To provide reinforcement and to

  Further, as shown in FIGS. 2 (B) and 2 (C), the anchor bolt 1 is tightened by the lower flange 3c. Therefore, the lower flange 3c is provided with a through hole for inserting the anchor bolt. The non-shrink mortar 6 is filled between the and the base 2.

  On the other hand, the steel frame column 4 is also formed of H-shaped steel, and the lower end thereof is welded (in this example, partial penetration welding) to the upper surface (upper flange 3b) of the base steel frame 3. However, the steel frame column 4A (see FIG. 1) at the corner portion is configured using a steel box column.

  Furthermore, as shown in FIG. 1, a steel frame beam 7 extending along the outer periphery is rigidly connected to the upper portion of the steel frame column 4, and an orthogonal beam 8 extending toward the inside of the building is a steel frame column 4 or a steel frame beam 7. (In this example, it is pinned to a steel frame beam). The steel frame beam 7 and the orthogonal beam 8 can be configured using, for example, H-shaped steel or the like.

In the building of this example having the above configuration, the base steel frame 3 is disposed along the outer periphery of the building, and the steel frame column 4 is welded thereon, so the rotational rigidity by the anchor bolt 1 specifications is k1 and the base steel frame 3 Assuming that the rotational stiffness is k2, the rotational stiffness K of the column base structure of this example is the stiffness of the series sum of the rotational stiffnesss k1 and k2, that is,
K = 1 / [(1 / k1) + (1 / k2)]
It can be done. Therefore, the rotational stiffness K can be evaluated higher than the rotational stiffness k1 of the conventional exposed column base according to the same specifications of the anchor bolt 1.

  Further, the configuration of welding the steel frame column 4 to the base steel frame 3 can increase the freedom of the arrangement of the steel frame column 4. Moreover, since the steel frame column 4 is used as a seismic element, it is possible to realize a clean frame without a seismic wall or a brace.

  Furthermore, by constructing a one-way rigid frame structure with the steel frame beam 7, the steel frame column 4, and the base steel frame 3, and making the orthogonal beam 8 extending in this rigid frame structure a pin joint, bending stress in the out-of-plane direction is not generated. As a result, it is possible to reduce the cross section of the steel frame column 4.

  Then, as shown in FIG. 3 (A), since no bending moment occurs at the portions where the base steel frames 3 having the same length and welded to each other at the center of the beam span are adjacent to each other. Can be pin-joined (see, for example, FIG. 3B) to simplify the joining operation. 3B shows an example in which the webs 3a of the adjacent base steel frames 3 are connected by the connection plate 9 and the fastener (for example, bolt and nut) 10, and the connection plate 9 is the web 3a. It may be disposed only on one side or on both sides.

  On the other hand, it is desirable that, at a location where a bending moment is generated at a location where the base steel frames 3 are adjacent to each other, for example, as shown in FIG. 3C shows an example in which the upper and lower flanges 3b and 3c as well as the adjacent webs 3a of the base steel frame 3 are connected to each other by the connecting plate 9 and the fastener 10, and the connecting plate 9 are disposed on both sides of the upper and lower flanges 3b and 3c. Further, in the case where a plurality of steel frame columns 4 are connected in the vertical direction, the connection may be rigidly connected as shown in FIG. 3C, for example.

  The present invention is not limited to the above embodiment, and it is needless to say that the present invention can be modified in various ways without departing from the scope of the present invention. For example, the following modifications can be mentioned.

  Although only one layer (the first floor) is shown in FIG. 1, the building of the present invention may have two or more layers.

  The base steel frame 3, the steel frame column 4, the steel frame beam 7, and the orthogonal beam 8 are not limited to the H-shaped steel, and may be configured using a shaped steel or a steel pipe of other shapes.

  Although the anchor bolt 1 is tightened by the lower flange 3c in the example shown in FIG. 2 (B) or the like, the present invention is not limited to this. For example, as shown in FIG. In this case, it is conceivable to provide through holes for inserting the anchor bolt in the upper and lower flanges 3b and 3c and provide a pressure receiving plate (base plate) 11 made of, for example, steel on the upper surface side of the upper flange 3b.

  Needless to say, the above-described modifications may be combined as appropriate.

DESCRIPTION OF SYMBOLS 1 anchor bolt 2 foundation 3 foundation steel frame 3a web 3b upper flange 3c lower flange 4 steel frame column 4A steel frame column of corner part 5 support plate 6 non-shrink mortar 7 steel frame beam 8 orthogonal beam 9 connection plate 10 fastener 11 pressure receiving plate

Claims (3)

A base steel frame that is tightened to the foundation by anchor bolts and extends along the outer circumference in an interconnected manner;
A building comprising: a plurality of steel frame columns welded to a top surface of the base steel frame.   The steel frame beam extending along the outer periphery is rigidly connected to the upper portion of the steel frame column, and the orthogonal beam extending toward the inside of the building is pin-connected to the steel frame column or the steel frame beam. Building. The building according to claim 1 or 2, wherein the base steel frames are pin-connected to each other at a location where the base steel frames having the same length and welded with the steel frame columns are adjacent to each other at the center of the beam span.