JPH09256469A - Earthquake-resistant RC core wall building - Google Patents

Abstract

(57) [Abstract] [PROBLEMS] To provide an RC core wall building having improved earthquake resistance. SOLUTION: An independent column is provided on an outer wall part adjacent to the walls of the core part on both sides of the building, and the column and the wall of the core part are connected by a steel beam.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-sided core type RC core wall building in which core portions are provided at both ends of the building, and more particularly to a seismic resistant RC core wall building having improved seismic resistance.

[0002]

2. Description of the Related Art RC core wall building is a reinforced concrete seismic-resistant structure that surrounds the core of a building where equipment pipes, shafts for ducts, equipment space, stair rooms, elevator shafts, toilets, halls, etc. are centrally arranged. By arranging the core wall, the surrounding columns and beams are made of steel frame,
It has a structure that allows the earthquake-resistant core wall to bear most of the horizontal force applied to the building during an earthquake. Regarding the arrangement of the core part, it is generally considered to be a double-sided core type in which a core part is provided at each end of the building, a center core type in which a core part is provided in the center of the building, or an eccentric core type in which a core part is provided at one end of the building. ing.

In RC core wall building, the layout of columns is relatively free and various planning is possible.
By using high-strength concrete to reduce the wall thickness of the core, a living area can be secured. In addition, since the core part can be constructed in advance using a large formwork, it has recently started to be applied to skyscrapers due to its excellent features such as safety in construction and improved productivity.

[0004]

However, in RC core wall buildings, even if high-strength concrete is used, the seismic resistance of the RC core wall building is increased so that most of the horizontal force applied to the building at the time of an earthquake is applied to the seismic resistant core wall. The core wall has a large wall thickness and a large amount of reinforcement. further,
As for the beams, the horizontal force applied to the building during an earthquake is transmitted to the seismic resistant core wall, so it was necessary to use a member with a large cross section in order to secure its rigidity.

[0005]

A seismic resistant RC core wall building of the present invention is provided with an independent column on the outer wall portion adjacent to the walls of the core portion on both sides of the building, and the column and the wall of the core portion are made of steel frame. The beams, which are connected between the structural beams, are located between the highly rigid seismic resistant core wall and the columns of the highly rigid outer wall, and are easily yielded when horizontal force is applied by the earthquake. , Because it absorbs energy, the rigidity of other beams can be reduced,
Further, it becomes possible to reduce the force and deformation acting on the RC core portion.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view of an RC core wall building. The RC core wall building 1 serving as an office is a two-sided RC core wall building in which the core parts 3 are arranged on both sides of the office space 2. The core part 3 has a reinforced concrete seismic resistant core wall 4 arranged around it, and an opening 5 for securing a flow line to the office space 2 and an opening 5'for daylighting are the core parts of the RC core wall building 1. 3 are arranged substantially in the center.

FIG. 2 is an elevation view of the RC core wall building. RC core wall Seismic core walls 4 and 4 on both sides of building 1
Is connected at its top by a hat truss 6 made of a steel mega frame. RC core wall Independent columns 7 on the outer wall adjacent to the earthquake-resistant core walls 4 and 4 on both sides of the building 1.
Is a steel-framed reinforced concrete structure and has a higher rigidity than the other columns 8 made of steel. The steel-framed beam 9 between the earthquake-resistant core wall 4 that bears the horizontal force at the time of the earthquake and the pillar 7 of the outer wall portion having a highly rigid structure is horizontal compared to the other steel-framed beams 10 due to the earthquake. When a force is applied, stress is concentrated because stress is concentrated, and energy is absorbed by yielding, so the rigidity of the other beams 10 can be reduced, and the force acting on the seismic-resistant core wall 4 and deformation should be small. You can

For the independent columns 7 of the outer wall portion adjacent to the earthquake-resistant core walls 4 and 4, a high-strength precast concrete structure obtained by steam curing or the like, or a filled steel pipe concrete structure for filling concrete into a steel pipe may be used. .

Further, a large stress is concentrated on the opening of the wall of the core portion forming the earthquake-resistant wall, and the wall beam arranged above the opening is a short beam, so that the stress applied to the beam is small. Since it will be even larger, when the wall beam is made of reinforced concrete, an X-type bar arrangement beam is often used because it does not have an excessive amount of bar arrangement and a structure with high resistance is obtained.
In addition, steel beams are often used because of their higher workability than reinforced concrete structures.

The X-shaped reinforcing beam made of reinforced concrete is particularly suitable for short beams, and a structure having high proof strength is obtained and is often used. However, the reinforcing bar is complicated, for example, one reinforcing bar is used. Since the bar is bent from the upper part to the lower part and the X shape is formed by this combination, the processing efficiency of the reinforcing bar is poor, and the reinforcing bar work also requires a lot of time and labor. . In addition, when using steel beams with an emphasis on workability, the deformation of the beams becomes large due to the high concentration of stress applied to the core wall, and it becomes very easy to yield quickly, so it is necessary to make the cross section large. There is a big limitation on the shape of the opening, and further, since the steel beam is fixed to the concrete wall, the fixing portion has a complicated shape, and the workability thereof is deteriorated.

Therefore, in the RC core wall building of the present invention, steel columns are erected by partially fixing them to the core wall, and the columns are connected by steel beams to form an opening. The structure around the opening forms a rigid frame structure made of steel columns and beams, so deformation of both columns resists excessive stress, so the rigidity of the columns and beams is high. By adjusting each, it is possible to avoid concentration of stress on the beam and prevent early yielding of the beam alone, there is no need to use an excessively large structural member, and the shape of the opening is not limited. Since the steel columns and beams form a frame, they can be easily fixed to the core wall and workability is enhanced.

The details around the opening will be described below with reference to FIG. The steel-framed columns 11 and 11 made of H-shaped steel and the like and the beams 12 arranged at both ends of the opening 5 are rigidly connected to each other at a joint 13 to form a rigid frame structure. The pillar 11 is firmly fixed at its middle portion to a pillar mounting member 15 embedded in the core wall 4 and having a stud dowel 14 which is a pull-out resistance member by bolts 16. Styrofoam 1 that insulates the core wall 4
It is movably fixed to the core wall 4 via 7.

The stress applied to the core wall 4 depends on the beam mounting member 15.
And the bolts 16 are transmitted to the pillars 11 and the pillars 11 and the beams 12 form a rigid frame structure. Therefore, the stress is shared according to the rigidity of the pillars 11 and the beams 12, respectively. By adjusting the respective rigidity, excessive stress concentration on the beam 12 can be avoided, the structure does not become excessive, the workability is high, and the shape of the opening is not restricted.

The arrangement of the openings 5 is not limited, and the columns 11 and the beams 12 having a steel frame structure can be arbitrarily selected from commonly used steel members such as square steel pipes in addition to the H-shaped steel.
Fixing of the pillar 11 to the core wall 4 is not limited to this embodiment. Further, the pillar 11 and the core wall 4 may be insulated by simply providing a space.

[0015]

According to the RC core wall building of the present invention, an independent column is provided on the outer wall portion adjacent to the walls of the core portion on both sides of the building, and the column and the wall of the core portion are connected by a steel beam. The beam placed between the highly rigid earthquake-resistant core wall and the column of the highly rigid outer wall part easily yields and absorbs energy when horizontal force is applied by the earthquake. Therefore, the rigidity of the other beams can be reduced, and the force and deformation acting on the RC core portion can be reduced.

[Brief description of drawings]

[Figure 1] RC core wall floor plan

[Figure 2] RC core wall building elevation

[Fig. 3] Detailed view around the opening

[Explanation of symbols]

1: RC core wall building 3: Core part 4: Earthquake-resistant core wall 5, 5 ': Opening part 7: Column of outer wall part 8: Other column 9: Beam 10: Other beam 11: Column 12: Beam 15: Column Mounting member

Claims (1)

[Claims] 1. An RC core wall building having core portions on both sides of a building, wherein an independent column is provided on an outer wall portion adjacent to a wall of the core portion, and the column and the wall of the core portion are made of a steel beam. Earthquake-resistant RC core wall building characterized by being connected.