JPH11117387A - Column and beam construction for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To produce an operation effect of base isolation or vibration control of a building by a method wherein construction of a column and a beam for a building forms structure that columns and beams for constituting column and beam construction have sides joined together through contact-bonding and a contact bonding force large enough to generate a shearing force in a frictional resistance surface within a contact bonding joining surface. SOLUTION: A column 1 and a beam 2 have respective sides joined together and are structured such that frictional resistance is generated on a contact bonding joint surface 4 to apply a vertical contact-bonding force on a joint surface. Concretely, column and beam construction is structured such that a fundamental shape consisting of four columns 1 and four beams 2 is irregularly continuously and joined with a plane. The fundamental shape is formed such that a horizontal section for four columns 1 is formed in a square shape, four beams 2 are arranged at the outer side of each of the columns 1, and the two end parts of each beam 2 are contact-bonded and joined with the side of the column 1 brought into contact therewith. Answer is effected through deformation of an elastic area wherein bending moment by the frictional force of a shearing force in frictional resistance of a contact-bonding joining surface 4 is balanced with bending moment applied from an external part. This constitution produces an operation effect of base isolation and earthquake control of a building.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology of seismic isolation or vibration suppression applied to a joint of a beam-column frame of a building which is repeatedly subjected to large horizontal deformation. The present invention relates to a beam-column structure of a building for absorbing seismic input energy and the like entering a building by generating a large hysteretic absorption energy.

[0002]

2. Description of the Related Art Conventionally, in a reinforced concrete construction, as a pillar-column structure of a building, as shown in FIG. 7, a precast concrete member a is pressure-bonded with a prestress (PC steel material) b, or concrete or mortar is filled between members. A structure for achieving integration is known. In this case, the joint between the column 1 and the beam 2 constituting the column-beam frame is usually designed as a rigid joint by joining the column 1 and the beam 2 in a plane as shown in FIG. Although not shown, in steel structures, columns and beams are widely joined in-plane by bolts or welding.

[0003]

As described above, the conventional beam-column structure of a building is presumed to be joined in a plane, and as shown in FIG. 9, an exaggerated schematic diagram is usually used. The yield hinges 3 are planned on the column base and each beam end of the first floor of the building, and when the beam-column frame undergoes a large horizontal deformation such as a large earthquake, the yield hinges 3 absorb the seismic energy and the like. Configuration. Therefore, the joint of the beam-column frame is designed so as not to be broken before the hinge is formed. When the seismic energy or the like exceeding the design input energy enters the beam-column frame, the yield hinge 3 is based on the premise that the joint of the beam-column frame is necessarily collapsed. In the later column / beam frame, cracks occur at the ends of the beam 2 or a phenomenon in which the rebar yields occurs, so that it is almost impossible to use the column / column frame thereafter.

Accordingly, an object of the present invention is to provide a large damping effect (history absorption energy) due to the elasto-plastic history, which greatly absorbs the seismic input energy and the like entering a building or the like, and exerts the effect of seismic isolation or vibration suppression. , To provide a column-beam structure of a building. A second object of the present invention is to provide a column-column structure of a building, which can regenerate a column-column structure as a structural frame by restoring residual deformation with a jack or the like even after a large earthquake. .

It is a further object of the present invention to provide a column and beam frame for a building which enables a reduction in design cost and a shortening of a design period, a reduction in construction cost and a shortening of a construction period, an increase in the degree of freedom in design design, and the like. To provide.

[0006]

Means for Solving the Problems As means for solving the above-mentioned problems, a column-beam frame of a building according to the first aspect of the present invention comprises a column 1 and a beam 2 constituting the column-beam frame. The side surfaces thereof are pressure-bonded to each other, and the pressure-bonding surface 4 is provided with a pressure-bonding force large enough to generate a frictional resistance in-plane shear force.

According to a second aspect of the present invention, there is provided a pillar-to-column frame for a building, in which the columns 1 and 2 constituting the column-to-column frame are crimp-joined on their side surfaces, and a frictional resistance is formed on the crimp-joining surface 4. A frame portion to which a crimping force large enough to generate an in-plane shear force is provided, and columns 1 and beams 2 ′ constituting the column-beam frame
Is characterized by a combination with a frame portion joined in a plane.

According to a third aspect of the present invention, there is provided a column-beam frame for a building, wherein the crimping force according to the first or second aspect is applied by prestress. Claim 4
The column-beam frame of the building according to the invention described in (1) acts on the bending moment due to the frictional force of the in-plane shear force of the frictional resistance of the pressure-bonded joint surface (4) between the column (1) and the beam (2) described in (1) or (2). When the bending moment is balanced with the bending moment and the externally applied bending moment is equal to or higher than the yield moment, slippage occurs on the press-bonded joint surface 4 to form the plastic hinge 3.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The pillar-to-column frame of a building according to the first aspect of the present invention constitutes a beam-to-column frame as illustrated in a typical embodiment in FIGS. The column 1 and the beam 2 are characterized in that the side surfaces thereof are pressure-bonded to each other, and the pressure-bonding surface 4 is provided with a pressure-bonding force of a magnitude that generates a frictional resistance in-plane shear force. In short, the column 1 and the beam 2 are configured such that the side surfaces thereof are joined to each other, and a frictional resistance in-plane shear force is generated on the crimping joint surface 4 to which a crimping force perpendicular to the joint surface is applied. Specifically, the column-beam frame is a structure in which the basic shape as shown in FIG. 3 composed of four columns 1 and four beams 2 is irregularly and continuously joined to a plane. In the basic form, four pillars 1 are each formed in a rectangular cross section in a horizontal section, and four beams 2 are arranged on an outer surface formed by each of the four pillars 1, and both ends of each beam 2 are in contact with each other. It is pressure-bonded to the side surface of the pillar 1. However, due to its structure, a substantially central side surface of the beam 2 may be pressure-bonded to the side surface of the column 1 as in the column-beam frame shown in FIG. Note that the shape of the beam-column structure is not limited to this, and the columns 1 and the beams 2 constituting the beam-column frame may be any shape as long as their side surfaces are crimped. The material of the column 1 and the beam 2 may be reinforced concrete, steel frame, or any other material that can be used for columns and beams. For example, a combination of different materials such as a reinforced concrete pillar and a steel beam can be used.

The means for applying a crimping force for generating a desired amount of frictional in-plane shearing force at the joint surface (compression joint surface 4) between the column 1 and the beam 2 is that the column 1 and the beam 2 are made of cast-in-place concrete. Regardless of whether it is made of precast concrete or made of precast concrete, various techniques known and known to those skilled in the art can be employed as needed. For example, one or more (two in this embodiment) sheathed PCs in a direction perpendicular to the crimping joint surface 4 of the column 1 and the beam 2 so as to be frequently used for installing an earth anchor or performing prestressed concrete. The steel strands 5 are arranged as shown in FIG. 1 and FIG. 2, the fixing process is performed using fixing and tension fixing devices, and a tension jack is installed on the tension side fixing device. A required amount of tensile force is introduced into the PC steel strand 5 to perform pressure bonding (the invention according to claim 3).

When the bending moment due to the frictional force of the in-plane shear force of the frictional resistance of the pressure bonding surface 4 of the column 1 and the beam 2 and the bending moment acting from the outside are balanced, a so-called “medium-to-small earthquake” Responds with deformation in an elastic region that does not leave residual deformation without causing in-plane rotational slip due to the frictional force corresponding to the static friction coefficient of the pressure bonding surface 4. However, when the bending moment acting from the outside becomes equal to or greater than the yield moment, slippage (plastic deformation) occurs on the pressure-bonded joint surface 4, and the yield hinge (plastic hinge) 3 is formed as shown in FIG. Absorbs input energy during an earthquake (the invention of claim 4).

As shown in FIG. 5, an embodiment of a pillar-to-column frame of a building according to the present invention is a column-to-column structure, in which columns 1 and beams 2 are joined by pressure bonding. Then, the frame portion in which the pressure bonding force having a magnitude that generates the frictional resistance in-plane shear force is applied to the pressure bonding surface 4, and the columns 1 and 2 ′ constituting the column-beam frame are formed in a plane. It is characterized by a configuration consisting of a combination with a joined frame part. In short, the present invention is a configuration in which the column-beam frame according to the first aspect of the invention and the conventional frame are used together. Also in this embodiment, the means for applying a crimping force for generating a desired amount of frictional resistance in-plane shearing force on the joint surface (the crimping joint surface 4) between the column 1 and the beam 2 is the same as that of the first embodiment. This is performed by the same means as described in the column-beam frame of the building (the invention according to claim 3). Further, in this embodiment, the portion where the side surfaces of the columns 1 and 2 constituting the column-beam frame are joined by pressure bonding is also the column-beam frame of the building according to the invention described in claim 1 above. The same effect as described above is obtained (the invention according to claim 4).

In addition, from the viewpoint of pressure bonding to the side surface of the beam 2, as shown in FIG.
Can be side-pressed to the beam 2 and used as an energy absorbing damper.

[0014]

[Effects of the present invention] According to the column-beam frame of the building of the present invention, a large damping effect is obtained by the elasto-plastic history with respect to the input of seismic energy and the like. In addition, the concrete at the end of the member does not collapse even after a large earthquake, so if the residual deformation is restored with a jack, it can be regenerated as a structural frame. Therefore,
The column-beam frame of the building according to the present invention can be a stock in units of centuries, unlike a building in which scrap and build are repeated for each earthquake reproduction cycle.

[0015] Further, when compared with ordinary PC pressure bonding,
Since joint mortar is not required, the joint sheath joining process, mortar single-frame building process, mortar injecting process, mortar curing period, and mold release process are eliminated, and the process can immediately proceed to the crimping process. The cost of construction and the process are shortened.

[Brief description of the drawings]

FIG. 1A is a plan view showing an example of a beam-column frame of a building according to the invention described in claim 1, and FIG. 1B is a front view thereof.

FIG. 2A is a plan view showing an example of a beam-column frame of a building according to the invention described in claim 1, and FIG. 2B is a front view of the same.

FIG. 3 is a principle view showing a basic form of a beam-column structure.

FIG. 4 is an elevation view showing a horizontal deformation state of the column-beam frame.

FIG. 5A is a plan view showing an example of a beam-column frame of a building according to the second aspect of the invention, and FIG. 5B is a front view of the same.

FIG. 6 is a front view showing another embodiment.

FIG. 7 is a partial sectional view showing a conventional beam-column structure.

FIG. 8 is a plan view showing a conventional beam-column structure.

FIG. 9 is an elevation view showing a state in which a conventional beam-column structure is horizontally deformed.

[Explanation of symbols]

 Reference Signs List 1 pillar 2 beam 2 'beam 3 plastic hinge (yield hinge) 4 crimping joint surface 5 PC steel strand 6 stud

Claims (4)

[Claims] A side wall of a column and a beam constituting a column-beam frame are crimped to each other, and a crimping force large enough to generate a frictional resistance in-plane shear force is applied to the crimped joint surface. A column-beam structure for buildings. 2. A frame having a column and a beam constituting a column-and-beam frame, the side surfaces of which are crimp-bonded to each other, and a crimping force large enough to generate a frictional resistance in-plane shear force is applied to the crimping joint surface. A beam and column structure of a building, characterized in that the portion and a column and a beam constituting the beam and beam frame are composed of a combination of frame portions joined in a plane. 3. The column-beam frame of a building according to claim 1, wherein the crimping force is given by prestress. 4. The bending moment due to frictional force of the in-plane shear force of the frictional resistance of the pressure-bonded joint surface of the column and the beam and the bending moment acting from the outside are balanced, and the bending moment acting from the outside becomes greater than the yield moment. 3. The column-beam frame of a building according to claim 1, wherein a slippage occurs on the pressure-bonded joint surface to form a plastic hinge. 4.