JP3784275B2 - Building frame structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a through beam in a beam direction and a crossing direction arranged so as to form a protruding corner on a building plane, and a frame structure of a building in which the vicinity of the protruding corner of the through beam is supported by a column of a truss frame. .
[0002]
[Prior art]
As shown in FIG. 4, the structure of the building has a single structure in each protruding corner portion b formed by connecting the through beams a in the beam direction and the through beams a in the row direction constituting the floor of the building. A truss column f of a truss frame composed of a column c, two side columns d, and an oblique column e connecting the middle column c and each side column d is provided, and a floor of an upper floor is further provided on the truss column f. There is a structure in which the truss column f is further provided at each protruding corner b formed by connecting the through beams g to each other.
At this time, the middle column c and the side columns d constituting the truss column f arranged at the protruding corner b formed by connecting the through beams a with each other, the vertical force such as the building's own weight or loading load is applied to the ground. In order to convey, it has a structure in which a foundation h is arranged in a direct downward direction. That is, in FIG. 4, each of the columns constituting the truss column if the fabric foundation or the like is positioned as the foundation h directly below the middle column c and each side column d along the through beam a, and the foundation of the building is an independent foundation. The pile foundation is positioned in the direction directly below and each column is connected to the pile foundation.
[0003]
[Problems to be solved by the invention]
As described above, the conventional frame structure in which the truss column for positioning the middle column is provided at the protruding corner portion formed from the through beams constituting the floor of the building and directly connected to the foundation based on the middle column positioned at the protruding corner portion is as follows. It has the following problems.
[0004]
The truss columns and foundations located at each corner of the building floor generate additional axial force due to the overturning moment that occurs during an earthquake. Therefore, the truss columns and foundation must be structured to withstand this additional axial force. There is a need.
[0005]
At this time, for the truss columns, for example, it is necessary to enlarge the cross section of the middle column and each side column. Thus, a structure capable of withstanding the additional axial force can be obtained by increasing the cross section of each column and obtaining sufficient rigidity, but the manufacturing cost of the truss column increases.
[0006]
The foundation disposed in the portion directly below each column constituting the truss column also needs to have a strong structure like the truss column. For example, when using an independent foundation, it is necessary to reinforce the cross section or add a core rebar. When using a cloth foundation, the cross section is enlarged or a known reinforcing means is added. There is a need to. Thereby, by giving sufficient rigidity to a foundation such as a pile, a structure that can withstand the additional axial force can be obtained, but on the other hand, the manufacturing cost of the foundation structure increases.
[0007]
OBJECT OF THE INVENTION
The present invention has been made in view of the above problems, and the object of the present invention is to arrange the truss pillars at the projecting corners of the building in a plane L shape so that the stress at the projecting corners is reduced. An object of the present invention is to provide a frame structure for a building that can be distributed on each surface composed of truss pillars and can omit the foundation of the portion immediately below the projecting corner of the building.
In particular, it is an object of the present invention to provide a frame structure of a building that does not make the cross sections of the middle and side columns of the truss columns excessive.
It is another object of the present invention to provide a building frame structure that can disperse and reduce the stress of the building surface facing the outer periphery of the building.
Furthermore, it is providing the frame structure of the building which can reduce the manufacturing cost of a foundation structure.
The present invention achieves at least one of these objectives.
[0008]
[Means for Solving the Problems]
As means for solving the above-described problems, the present invention provides a truss constructed by a through beam, a middle column, an oblique column, and a side column constructed in a beam-to-beam direction and a column direction in a building plane , and constructed on the through beam. A column group of a frame, and the column group is substantially L-shaped in a plane centering on a protruding corner portion formed at a connection portion between a through beam erected in a beam-to-beam direction and a through beam erected in a cross-beam direction. it is arranged, characterized in that the foundation directly below the portion of the center post disposed on the external corner portions are have divided a Frame structure of a building. In the present invention, the columns of the truss frame having the above-described configuration are respectively installed at the four corners of the building so that the planar shape is substantially L-shaped, and are supported in a cantilever form from adjacent walls by through beams. Build a frame and distribute the stress of the frame facing the outer circumference to other frames. As a result, in the present invention, it is possible to omit the foundation located at the corner of the building. The columns of the truss frame described above are arranged so that the planar shape is substantially L-shaped with the protruding corner as the center. At this time, one of the columns is a truss frame and the other is a known column structure other than the truss frame. Or it can also be set as a well-known wall body and combining these. Here, the column of the truss frame refers to a known truss column in which the joint ends of the columns are pin-coupled. In addition, when adding a beam substantially orthogonal to the through beam between the protruding corners, a truss column having a substantially T-shaped planar shape can be added at the intersection.
[0009]
DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1
Hereinafter, a case where an independent foundation using a pile is used as an example of a frame structure of a building will be described with reference to the drawings.
[0010]
<B> Overall configuration The building frame structure 10 of the present invention is formed in the vicinity of the projecting corner 30 formed by connecting the through beams 20 in the inter-beam direction and the through beams 20 in the row direction constituting each floor of the building. The truss column 40 of the truss frame is interposed between the through beams 20 constituting the upper and lower floors.
That is, in the first floor, the middle column 41 is formed between the protruding corner portion 30 of the foundation beam 50 and the protruding corner portion 30 formed by connecting the through beams 20 constituting the first floor beam 60 positioned above the basic beam. The truss pillars 40 are interposed so as to be positioned, and on the uppermost floor, the projecting corners 30 formed by connecting the through beams 20 constituting the floor of the lower floor and the through beams 20 constituting the beam 70 of the roof floor. The truss column 40 is interposed so that the middle column 41 is positioned between the protruding corner portions 30 of each other.
In the present embodiment, the configuration of each part will be described by taking the two-story building shown in FIG. 1 as an example.
[0011]
<B> The floor of the floor building is configured by combining through beams 20. Specifically, in the through beams 20, those in the direction between the beams located in the outer periphery of the floor and in the direction of the crossing are connected to form a protruding corner 30, and another through is appropriately provided between the through beams 20 positioned between the protruding corners 30. A required number of beams 20 are arranged and combined, for example, so as to have a cross beam shape shown in FIG. In the present embodiment, as shown in FIG. 1, a base beam 50, a first-level beam 60, a beam 70 on the roof of a building, and the like, which are configured by combining four through beams 20 positioned on the outer periphery of each floor. Is an example of the floor described here.
The floor is not limited to the one having a quadrangular shape as shown in FIG. 1, and a conventionally known structure can be adopted, and a protruding corner portion 30 in which a truss column 40 to be described later is disposed by a through beam 20 is provided. What is necessary is just to form.
[0012]
<C> Truss column Truss column 40 is formed by connecting middle beam 41 disposed at projecting corner 30 formed by connecting through beams 20 to each other, side column 42 disposed between projecting corners 30, and one beam 50. It is comprised from the diagonal column 43 which connects the edge part of the middle pillar 41 connected, and the edge part of the side pillar 42 connected to the beam 60 of the other floor. The truss column 40 in FIG. 2 is an example formed in a substantially plane L shape centering on the middle column 41 located at the protruding corner portion 30 of the foundation beam 50.
As the name suggests, the truss column 40 is configured such that the coupling between the columns 41, 42, 43 and the coupling portion between the columns 41, 42 and the beams 50, 60 are rotatable by pin coupling.
Note that the oblique column 43 is connected to the end of the middle column 41 connected to the first floor beam 60 and the end of the side column 42 connected to the foundation beam 50, so that the arrangement opposite to the above connection is achieved. It is also possible to do.
[0013]
<D> Foundation Structure A known foundation such as an independent foundation such as a cloth foundation or a pile can be applied to the foundation structure. Here, the feature of the present invention is that the basic structure of the portion directly under the protruding corner portion 30 can be omitted. That is, the foundation structure is not disposed directly below the middle pillar 41 constituting the truss pillar 40, and the foundation structure is positioned at a lower portion of the portion excluding the protruding corner portion 30 such as the side pillar 42. Specifically, the middle column 41 disposed on the foundation beam 50 at the lowest layer of the building is pin-coupled to the foundation beam 50, but no foundation structure is provided immediately below it. That is, in the case of an independent foundation structure, the pile 51 and other foundations are not provided directly under the protruding corner portion 30, and in the case of a cloth foundation (not shown), the cloth foundation is not extended to a position immediately below it, Make sure that no power is transmitted between the foundation and the foundation.
That is, according to the present invention, truss columns 40 are installed at the four corners of a building, and a three-dimensional upper frame supported in a cantilever form from adjacent truss columns 40 (walls) by through beams 20 is constructed. A set of stresses is distributed to each surface of the truss column 40. As a result, in the present invention, it is possible to omit the foundation structure located at the projecting corner 30 of the building.
[0014]
Second Embodiment of the Invention
In the first embodiment of the present invention, in the through beams constituting the floor of the building, the middle pillar 41 is positioned at the protruding corner portion 30 formed by connecting the through beams 20 located in the inter-beam direction and the crossing direction. The truss column 40 to be disposed has been mainly described.
On the other hand, the example which arrange | positions the truss pillar 44 other than the protrusion corner part 30 is demonstrated with the top view of the frame structure of the building shown in FIG.
As shown in the figure, for example, when the through beam 20 between the protruding corner portions 30 is long, an additional beam 31 may be installed in the middle to maintain the rigidity of the through beam 20.
At this time, the truss pillars 44 can be disposed at the intersections between the two through beams 20 and the additional beams 31 facing each other. The truss column 44 includes a middle column 44 a and a side column 44 b disposed between the middle column 44 a and each protruding corner 30 and a side column 44 d in the middle of the additional beam 31. Further, oblique columns 44c are arranged between the middle column 44a and the side columns 44b, 44b, 44d, respectively. The truss column 44 configured in this manner is substantially T-shaped in a plane.
[0015]
[Action]
Referring to FIGS. 4 and 1, the force generated in the frame when a horizontal seismic force is applied to the frame (the X direction in FIGS. 4 and 1), the conventional technology (FIG. 4) and the building of the present invention The frame structure (Fig. 1) is compared based on the calculation results.
The overturning moment at the height position of the foundation beam h (50) due to the horizontal force shown in FIG. 4 and FIG. 1 is 46 ton · m per structural surface.
In the prior art, the truss column f has high horizontal rigidity because the portion directly below the middle column c where the protruding corner b is located is coupled to the foundation h. Of the entire overturning moment, each truss column f is shared by 11.6 ton · m, and the axial force of two truss columns f × column spacing is 23.2 ton · m. The axial force of each column is 14.9 ton for the middle column c1, 11.6 ton for the side column d1, and 0.5 ton for the side column d2.
In the building frame structure 10 of the present invention, since the middle column 41 located in the protruding corner 30 is not coupled to the foundation (pile in FIG. 1) 51, the horizontal rigidity of the truss column 40 is low. Of the entire overturning moment, each truss column 40 is assigned 1.0 ton · m, and the axial force of the two truss columns 40 × the column interval is 44.4 ton · m. The axial force of each column is 0 ton for the middle column 41a, 0.98 ton for the side column 42a, and 6.53 ton for the side column 42b.
Compared with the prior art, the building frame structure 10 of the present invention has a large share of the tipping moment divided by the axial force of the two truss columns 40 x the column interval, and the portion of the truss columns 40 is divided. small. In addition, since the axial force concentrated on the middle column c1 (41a) in the prior art is transmitted to the side column d2 (42b) by the beam in the Y direction, the axial force is averaged. Therefore, the axial force of each column can be very small compared with the prior art.
[0016]
【The invention's effect】
Since the present invention has been described above, the following effects can be obtained.
<A> The present invention is a three-dimensional structure in which truss columns each having a planar shape having the above-described configuration are provided at the corners of a building and are supported in a cantilever manner from adjacent walls by through beams. The upper frame is constructed, and the stress of the frame facing the outer periphery is distributed to the other frames. As a result, in the present invention, it is possible to omit the foundation located at the corner of the building.
<B> Since the rigidity of the truss column is lowered by not connecting the middle column located at the protruding corner of the truss column with the foundation, the vibration period of the frame becomes long, and a high damping effect can be obtained. As a result, it is no longer necessary to increase the column cross section of the middle column and the side column, as compared with the conventional technology in which the middle column and the side column of the truss column are connected to the foundation. As a result, the manufacturing cost of the truss pillar can be reduced.
<C> Similarly for the foundation, the rigidity of the truss column is reduced, which eliminates the need for reinforcement such as increasing the cross-section of the pile or adding a core rebar, which has been conventionally done. Can be reduced.
<D> As described above, since the member size can be reduced by the vibration damping effect of the frame, it is possible to construct an economical building.
<E> In the vibration isolation structure, the vibration isolation device disposed at the corner is unnecessary and economical.
<F> In addition to the frame structure of the present invention, it is possible to further enhance the vibration damping effect by employing a known vibration damping member at the corner of the foundation beam or other beam.
[Brief description of the drawings]
FIG. 1 is a perspective view of a building frame structure according to the present invention. FIG. 2 is a plan view of a building frame structure according to a first embodiment of the invention. FIG. 3 is a building according to a second embodiment of the invention. Plan view of the frame structure of an object [Fig. 4] Perspective view of the frame structure of a conventional building [Explanation of symbols]
20 ... Through beam 30 ... Outer corner 40 ... Truss column 41 ... Middle column 42 ... Side column 43 ... Oblique column

Claims (1)

A through beam erected in the direction between the beams in the building plane and in the direction of the beam;
A truss frame column group constructed of a middle column, an oblique column and a side column and constructed on the through beam,
The column group is arranged in a substantially L-shaped plane centering on a protruding corner portion formed at a connection portion between a through beam erected in the beam-to-beam direction and a through beam erected in the beam-row direction,
Characterized in that that is with the exception of the foundation directly below the portion of the center post disposed on the external corner portion,
The frame structure of the building.

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