JP2926106B2 - Large span suspension structure with V-shaped brace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

The present invention relates to a frame structure for forming a large pillar-free space on the first floor or a middle floor of a high-rise building.

[Prior art]

Conventionally, beams for each floor are passed over the pillars on both sides, and a pillar-free space is formed below this, or a truss floor is set as an appropriate floor and a truss floor is set as the height of one floor. Provided,
Compression columns or tension columns transmit the weight of each floor to the truss beams to support the floor, thereby forming a column-free space.

[Problems to be solved by the invention]

However, in the method of creating a column-free space underneath by simply passing a beam over the columns on both sides, if the span is expanded to form a wide column-free space, the horizontal rigidity of the beam decreases, so the beam width is increased. And as a result, an increase in floor height is inevitable. In addition, since the size of the beam is naturally limited in consideration of the floor height and the like, it is actually extremely difficult to form a wide column-free space by this method. On the other hand, in the structure using truss beams, there are problems that the use of the truss floor is limited, and that the horizontal rigidity of the floor is too large as compared with the other floors, and the rigidity is unbalanced. Was.

Means for Solving the Problems The present invention has been made to solve the above-mentioned problems of the prior art, and a V-shaped brace is erected as a suspension bridge using pillars on both sides as pillars, and the pillars on both sides are mounted on the pillars on both sides. The erected beam is
A large span suspension structure is provided by a V-shaped brace characterized by being suspended by a mold brace and forming a column-free space below the beam.

[Action]

The beam located above the column-free space is supported at both ends by columns facing both sides, and the middle part is suspended from above by a V-shaped brace. In fact, it is supported by a narrow span, and it is possible to form a wide column-free space below. In addition, it is also possible to keep the height of the building low by making the beam small. In a normal use condition, since a large tensile stress due to the vertical load of each floor acts on the V-shaped brace, even if horizontal stress is combined during an earthquake, a large compressive force does not act as a result. . Further, since the V-shaped brace is subjected to tensile yield, a frame structure having high toughness is obtained.

【Example】

Next, the present invention will be described in more detail based on one embodiment shown in the drawings. The exemplified building B is, for example, a twelve-storey high-rise building having a substantially rectangular shape with a horizontal cross section of 17 m × 50 m, and a strut portion 1 composed of four struts 11 to 14 is arranged at each of the four corners. Have been. In each strut part 1, the strut 11
6m apart between and 12 and 13 and 14 respectively,
Between 14 and between 12 and 13 are each 7 m apart, each connected to a foundation pile (not shown). Prop part 1
The distance between them is 5 m on the near side and 36 on the far side
m. Reference numerals 21 to 33 are appropriate intervals (for example, 3 to 4.5).
m), beams of each floor arranged in m), and slabs (not shown) are arranged on each floor, and each floor of the 1st to 12th floors is constructed. Reference numerals 41 to 45 are columns supporting the beams 23 to 33, which are installed at equal intervals of 6 m, and reference numeral 5 is a V-shaped brace. The V-shaped brace 5 is generally made of a steel frame or a strand in which a number of high-strength wires are bundled.
In each of the front surface portion B1 and the rear surface portion B2 corresponding to the long side of the building B, the support portions 1 on both sides facing each other are erected as a suspension bridge, and are also connected to the above-mentioned beams 23 to 29. A pillarless space B3 of about 600 m ² is formed below the lower part. That is, the beam 29 is connected to the pillars 11 on both sides at positions 51 and 57, and the beam 27 is located at the position 52 facing the column 41 and the position 56 facing the column 45, and the beam 25 is located at the position 53 facing the column 42. Pillar 44
At the position 55 facing the column 43, the beam 23 is connected at the position 54 facing the column 43, and for the beams 24, 26 and 28,
Each is connected to the V-shaped brace 5 via a lower beam connected by columns 41 to 45. The connection between the V-shaped brace 5 and these beams 22 to 33 is designed and constructed so that each of the beams 22 to 33 is horizontal when used in consideration of the weight of the equipment to be installed. That is, the beam 22 located above the column-free space B3
To 33 are suspended by a V-shaped brace 5 with appropriate tension, and beams 22 to 33 are suspended.
Each is built horizontally. Reference numeral 15 denotes a conventional type brace provided for reinforcement between the columns 11 and 12 on each floor and between the columns 11 and 14, respectively. In the high-rise building B having the above-described structure, the vertical loads on the respective floors from the beams 22 to 23 are supported by the pillars 1 on both sides via the respective ends and the V-shaped braces 5. Therefore, a large axial force is distributed on the outer peripheral portion of the building, and a large resistance force against the overturning moment at the time of the earthquake is provided. In addition, the support portion 1 has four support portions as in this embodiment.
Consists of 11-14, struts 11 and 12, and struts 11 and 14
By connecting each with a brace 15,
At positions 51 and 57, a part of the axial force transmitted from the V-shaped braces 5 to the respective columns 11 is transmitted to the remaining columns 12 and 14 having a small axial force via the braces 15, so that the V-shaped braces are used. 5 can further enhance the anti-seismic effect. Since a large tensile stress always acts on the V-shaped brace 5 due to the vertical load of each floor from the beams 22 to 33, even if a horizontal stress is added during an earthquake, a large compressive force will not act as a result. Absent. Therefore, V of the present invention
The member strength of the mold brace 5 is determined by the tensile strength, and the characteristics of the steel material are more effectively utilized than the conventional type brace designed with the buckling strength during compression. Therefore, if the dimensions are the same, there is an advantage that a strength greater than that of the conventional brace can be obtained. Furthermore, since it is tensile yielded, a frame with high toughness can be formed. It should be noted that the present invention is not limited to the above embodiments, and can be implemented in various forms according to the gist of the present invention. In other words, the building B is not limited to the number of floors, and the V-shaped brace 5 can be supported on the top floor of the column 1 facing the both sides. It is also possible to provide multiple floors. Further, the column-free space B3 can be provided not on the first floor but on an appropriate intermediate floor. Further, a structure in which the V-shaped brace 5 is arranged only at an intermediate portion between the front surface portion B1 and the back surface portion B2 of the building B can be adopted. By the way, the inner space of the pillar portion 1 provided at the four corners is surrounded by four pillars 11 to 14 and the brace 15
Can be used as a normal room, and can also be used as an elevator installation, a machine room, etc., so that the effective space can be obtained even if the column 1 is formed. It does not lead to a decrease.

【The invention's effect】

As described above, according to the large span suspension structure using the V-shaped brace according to the present invention, a wide column-free space having a width of 10 to 20 m and a length of 30 to 50 m can be easily formed in the low-rise portion of a high-rise building. Is possible, and the overall height does not increase unnecessarily because there is no need to increase the beam height. In addition, there is a merit that the degree of freedom for use on all floors is large. Furthermore, since the weight of the building is transmitted to the pillars on both sides via the V-shaped brace, a large axial force is distributed on the outer periphery of the building, resulting in a large resistance to the overturning moment during an earthquake. It will be an excellent building. And since the V-shaped brace is designed with the tensile strength, not only can the conventional brace of the compressive load design having the drawback that it is easily buckled be used, but also the member cost can be reduced by using a thinner member, Due to the tensile yield of the V-shaped brace, a frame structure with high toughness can be obtained. In addition, there is an advantage that there is no sudden change due to the horizontal rigidity, which is the fate of the truss structure, and its industrial value is extremely large.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing an embodiment of the present invention, FIG. 1 is a front view thereof, and FIG. 2 is a plan view thereof. 1 ... pillar part 11, 12, 13, 14 ... pillar 15 ... brace 21-33 ... beam 41, 42, 43, 44, 45 ... pillar 5 ... V-shaped brace B ... building B1 ... … Front surface B2 …… Back surface B3 …… Pillarless space

Claims (1)

(57) [Claims] 1. A V-shaped brace is erected in the form of a suspension bridge using pillars on both sides as pillars, and a beam erected on the pillars on both sides is suspended by the V-shaped brace to form a column-free space below the beams. Large span suspension structure with V-shaped brace.