JP2649666B2 - Beam steel support structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention supports a beam steel frame of a certain level framed between left and right column steel frames without an intermediate column between the left and right column steel frames. The present invention also relates to a beam steel support structure for forming a large span space under the beam steel.

[Conventional technology]

Conventionally, in a multi-story building, a large-span space having no intermediate pillars below a beam steel frame of a certain story is conventionally formed by forming a large-span space A as shown in FIG. the beam steel 12a hierarchy N ₀ and lower chord members, the beams steel 12b hierarchy N ₁ thereon as top chord member, the two beams steel 12a, the truss beam B by connecting a 12b by a plurality of diagonal members 14 ... The truss beam B for one floor is constructed between the left and right column steel frames 11, 11 to form a large span space A without intermediate columns between the left and right column steel frames 11, 11. . In the drawing, reference numeral 12 denotes a beam steel frame of another level, and reference numeral 13 denotes an intermediate column supporting the beam steel frame 12.

[Problems to be solved by the invention]

However, in the above truss beam B, the diagonal members 14
Are connected over the upper and lower beam beams 12b and 12a, which are upper and lower chords. In other words, the upper and lower chords connected by diagonal members are connected to the left and right column steel frames, respectively. , The rigidity becomes very high, causing the following problems.

That is, for a flexible structure type building such as a high-rise building or a super-high-rise building, the truss beams B having the above structure are framed on the left and right column steel frames 11 and 11, and a large span space is provided below the truss beams B. When A is formed, the truss beams B are framed and the upper and lower stories N ₁ and N ₀ lose the interlayer displacement, so that energy during an earthquake cannot be absorbed. For this reason, the entire building has a flexible structure. However, it was necessary to plan and design the part as a rigid structure, and the economical efficiency of the flexible structure was significantly impaired, which was very uneconomical.

Also, when a large span space A is formed in a part of the building plane, a stiff truss beam B exists only in a part of the building plane, and the eccentricity (planar distribution of the high stiffness part). However, the torsion of the building due to non-uniform condition) becomes a problem.

The present invention provides, by a reasonable improvement, a truss beam frame for a flexible structure type building in a state where interlayer displacement of the upper and lower layers is enabled, and the flexible structure type Along with making it possible to economically form a large span space under the truss beam of a building, and to easily configure a large span space in a part of the building plane without causing eccentric twisting. The purpose is.

[Means for solving the problem]

In order to achieve the above object, a supporting structure for a beam steel frame according to the present invention is a method for supporting a truss beam spanning approximately one floor, in a state where both ends of a lower chord material are separated from the left and right column steel frames. In the state where the frame steel frame of the lower layer than the layer where the truss beam is present is cut off from the truss beam, the lower layer is pierced via a suspension member having no rigidity in the beam longitudinal direction. It is characterized in that a steel frame is suspended and supported by the truss beams.

[Action]

According to the above characteristic configuration, although the rigidity of the truss beam itself for forming the large span space is high, both ends of the lower chord material of the truss beam are separated from the left and right column steel frames, and the truss beam and the lower portion thereof Because the beam steel frames of the hierarchy that forms the large span space of the truss beams are separated from each other, energy can be absorbed during an earthquake due to interlayer displacement between the upper and lower floors of the truss beams, and the truss beams can be locally erected. The entire building can be made into a flexible structure.

And since the interlayer displacement between the upper and lower floors of the truss beam is possible, even if a rigid truss beam is present in a part of the building plane to form a large span space, the building is not twisted due to eccentricity. No longer occurs.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a steel framed frame diagram of a part of a high-rise building,
2 and 3 show a partially enlarged view.

In the figure, 1 ... is a column steel frame, 2 ... is a left and right column steel frame 1,1
Beam steel frame 2 erected on each floor over a certain level N ₀
Except for the portion of the beam steel 2a forming a space A of a large span of the beam steel 2b hierarchy N ₁ part immediately thereon, the upper and lower beams Steel 2,2
Are connected by intermediate pillars 3.

The beam steel frames 2,..., 2a, 2b have an H-shaped cross section, and are framed between the left and right column steel frames 1, 1 with the web a facing vertically.

Then, the lower flange b of the hierarchical N ₁ beam steel 2b is
The diagonal members 4 which form three triangles (the number of which does not matter) with the beam steel frame 2b are suspended in a state where the vertices of the triangle are positioned near the beam steel frame 2a, and As shown in the drawing, a steel frame 5 is connected continuously with both ends separated from the left and right column steel frames 1 and 1, and the beam steel frame 2b and the steel frame 5 are used as upper and lower chord members. And these two
A highly rigid truss beam B is formed by connecting b and 5 with diagonal members 4.

The truss beam B and the beam steel frame 2a of the certain story No. ₀ are in a state of being cut off from each other, that is, the beam steel frame 2a of the certain story story No. ₀ forming the large span space A is a conventional truss beam. The lower chord of the truss beam B (the steel frame 5 with both ends separated from the column steel) near the upper part of the beam steel frame 2a without being the lower chord of the beam
Is located. The beam steel 2a is supported under suspension by the truss beam B via a suspending member 6 such as a high-strength steel bar or the like, and a large span space A without an intermediate column below the beam steel 2a. Is formed.

The suspending members 6 are provided at the apexes of the triangle formed by the diagonal members 4, 4 and the steel frame 5 at the apex of the upper and lower chord members of the truss beam B.
Are vertically penetrated, and a nut c is screwed to an end of the beam steel member in a state where there is no rigidity in the beam longitudinal direction.
2a is suspended and supported. Reference numeral 7 in the drawing denotes a floor constructed by arranging reinforcing bars and placing concrete on the upper surface of the deck plate.

According to the above configuration, even though the truss beam B itself has high rigidity, both ends of the lower chord material are separated from the column steel members 1 and 1, and the truss beam B and the beam steel member 2a are substantially separated. Since the truss beams B are in a marginal state, even if the truss beams B are locally erected on a certain story No. ₀ to form the large span space A, the whole building can be made into a flexible structure.

And since the interlayer displacement between the upper and lower layers N ₁ and N ₀ of the truss beam B is possible, even if the rigid truss beam B is present in a part of the building plane, the torsion of the building due to eccentricity is prevented. No longer occurs.

In addition, as the hanging member 6, there is no rigidity in the longitudinal direction of the beam, and a layer for forming the large span space A is provided.
Anything that has the tensile strength necessary to suspend and support the N ₀ beam steel frame 2a is sufficient, in addition to steel rods, a chain or wire rope, or arranged so that the plate surface is perpendicular to the longitudinal direction of the beam It can be implemented using a steel plate or the like.

FIG. 4 shows a first embodiment of a beam steel frame supporting structure for forming a large span space A. This thing is the case with low floor height of hierarchy N ₃ immediately above in the hierarchy N ₀ for forming a space A large spans can not form a large truss beams vertically width in need, and, next in the building to the general hierarchy of 3 Kaibun of hierarchy 2 Kaibun hierarchy not disadvantageous that the execution subject, multiple hierarchies on certain hierarchical N ₀ (3 hierarchical content of the general hierarchy in the illustrated example diagonal member to the beam steel frame 2b of hierarchy N ₁ above) 4
The truss beam B is constructed by connecting the steel frame 5 via… with both ends separated from the left and right column steel frames 1 and 1 and slightly larger than the height of the first floor of the general story. and, then, the downward vicinity of the truss beam B provided beam steel 2 Shitakai N _2, as well as the floor height of the hierarchical N ₂ in 2 storey near the height of the next general hierarchy, this hierarchy beams steel second beam steel 2 hierarchical N ₃ of the lower N _2, and the respective beam steel 2a of the certain hierarchy N _0, the vertex axes of the triangle by said steel 5 and diagonal members 4,4 While being connected by the intermediate pillars 3, 3 passing through the corresponding portions, the suspension members 6 having no rigidity in the longitudinal direction of the beam are penetrated through the beam steel frame 2b of the transformer beam B at the corresponding portions of the vertices of the triangle. the timber 6 ... lower end of and connected to the upper end portion of the intermediate pillar 3,3, have been, the beam steel 2a certain hierarchy N ₀ for forming a space a of the large span, the suspension member 6 ... and medium Via pillars 3,3, characterized in that to allow substantial hanging supported by truss beam B on three layers.

Although not shown in the drawings, the above-described support structure (also referred to as the support structure (see FIG. 3) is used even when the floor immediately above the floor forming the large span space has a lower floor and a higher floor exists above it. It is needless to say that a truss beam can be provided on the higher floor and a beam steel frame of a layer forming a large span space can be suspended and supported by the truss beam via a suspension member and an intermediate column. No.

FIG. 5 shows a second embodiment of the beam steel frame supporting structure for forming the space A having a large span. Again what, when and low floor height of hierarchy N ₃ immediately above in the hierarchy N ₀ for forming a space A large spans can not form a large truss beams vertically width in need, and, next those able to the three Kaibun hierarchy general hierarchy 2 Kaibun hierarchy was performed subject building is not inconvenient, multiple hierarchies on certain hierarchical N ₀ (substantially 3 hierarchy minute in the example shown diagonal member to the beam steel frame 2b of hierarchy N ₁ above) 4 ...
A large truss beam B extending up to 1.5 floors of a general story is constructed by connecting the steel frame 5 through the through-holes in such a manner that both ends thereof are separated from the right and left column steel frames 1 and 1. beams steel 2 of Shitakai N ₂ below and in the vicinity of the trusses beam B is provided, the hierarchical N ₂
Together with floor height is also a height close to 1.5 storey next to general hierarchy beam steel 2 hierarchy N ₃ thereunder and beam steel 2 in this hierarchy N _2, and the beam of the certain hierarchy N ₀ Each of the steel frames 2a is connected by an intermediate column 3, 3 whose axis passes through a portion corresponding to the apex of a triangle formed by the steel frame 5 and the diagonal members 4, 4, while the suspension members 6 having no rigidity in the longitudinal direction of the beam are connected to the above-mentioned members. At a portion corresponding to the vertex of the triangle, the beam A is penetrated through the beam steel frame 2b of the truss beam B, and the lower ends of the suspension members 6 are connected to the upper ends of the intermediate pillars 3, 3, so that the large span space A is formed. A beam steel frame 2a of a certain level N _{0 to be} formed,
It is characterized in that it is suspended and supported by truss beams B on three levels substantially via the suspending members 6 and the intermediate pillars 3,3.

As is clear from the above description of the other embodiment, the size of the truss beam B covering approximately one floor in the present invention is intended for a building portion forming a large span space A. In other words, when a building having a certain height of 1.5 or 2 times the general story in a certain part of the building is targeted, the truss beam B provided here is 1.5% of the general story.
Although the truss beam B is twice or twice as large, the truss beam B itself still has a size corresponding to about one floor, and such a truss beam structure is also an object of the present invention.

〔The invention's effect〕

As described above, according to the support structure for a beam steel frame according to the present invention, it is possible to form a large-span space without intermediate pillars in the lower story by using a highly rigid truss beam extending over about one story. Regardless, both ends of the lower chord of the truss beam are separated from the left and right column steel frames, and the truss beam and the lower level beam steel frame forming a large span space are cut off from each other by the truss beam. Since the steel frame is suspended and supported by truss beams via a rigid material in the longitudinal direction of the beam,
Energy absorption during an earthquake due to the interlayer displacement of the upper and lower floors of the truss beam becomes possible, and therefore, the entire building can be made into a flexible structure while locally constructing a rigid truss beam, It has become possible to economically construct a large span of space in high-rise or high-rise buildings. In addition, since the interlayer displacement between the upper and lower floors of the truss beam is possible, even if a rigid truss beam is present in a part of the building plane to form a large span space, the building is not twisted due to eccentricity. Therefore, a large span space can be easily formed even in a building where eccentricity is a problem.

[Brief description of the drawings]

FIG. 1 is an assembled view of a truss beam and a steel beam supported by the truss beam, and FIG. 3 is a plan view of the truss beam. . FIG. 4 and FIG. 5 are each a steel-truss frame diagram of a certain building part showing another embodiment of the beam steel frame support structure, and FIG. 6 is a configuration diagram of a conventional truss beam. 1 ... steel column, 2a ... steel beam, 6 ... hanging material, A ... large span space, B ... truss beam.

Claims (1)

(57) [Claims] 1. A truss beam spanning approximately one floor is constructed between left and right column steel frames with both ends of the lower chord material separated from the left and right column steel frames. In a state in which the lower-level beam steel frame is cut off from the truss beam, the lower-level beam beam is suspended and supported by the truss beam via a suspension member having no rigidity in the longitudinal direction of the beam. A beam steel support structure characterized by forming a large-span space without intermediate pillars below the beam steel frame of the story.