JPH05280092A - Joint construction of girder and pillar in prestressed concrete structure - Google Patents

Abstract

PURPOSE:To deal with absorption of energy due to plastic deformation of a structure at a big earthquake by means of the joint part between a pillar and a girder. CONSTITUTION:Many precast concrete pillars 1 are standingly provided on the base of concrete, and a girder receiving jaw 2 is formed in one body with the precast concrete pillar 1. The projection 4 on the end part of a precast concrete girder 3 is supported with the girder receiving jaw 2 through filler 5, and many precast concrete girders 3 are mounted extending over respective pillars 1 between. The precast concrete girder 3 is tensed by the tensile force of PC steel wires 6, prestress is given to it, and it is tensely fixed to the precast concrete pillar 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam-column joint structure in a prestressed concrete structure.

[0002]

2. Description of the Related Art Prestressed concrete structures are
Precast concrete girders are installed between the columns by supporting the jaws of the end of the precast concrete girders on the girder receiving projections of the precast concrete columns erected on the foundation. It is stressed and well established. At this time, the concrete strength of columns and girders and the strength of joint mortar are made almost the same. Therefore, such a prestressed concrete structure generally has a significantly higher elastic strength than the RC structure.

[0003]

However, in the prestressed concrete structure as described above, when the high restoring force is subjected to repeated positive and negative loading, the dynamic response is increased and at the same time, it is against a large earthquake. Is said to have low energy consumption capacity due to plastic deformation of structures. The present invention has been made in view of the above problems, and an object thereof is to achieve energy consumption due to plastic deformation of a structure in a large earthquake by damaging a filler in a joint between a column and a beam. It is to provide a beam-column joint structure in a prestressed concrete structure.

[0004]

[Means for Solving the Problems] In order to achieve the above objects, a joint structure of a beam and a column in a prestressed concrete structure of the present invention has a structure in which a large number of precast concrete columns are erected on a concrete foundation. The girder receiving projections are integrally formed on the concrete columns, and the girder receiving projections support the jaws of the ends of the precast concrete girders to lay a number of girders between the columns. The precast concrete girders are made of PC steel wire. In a joint structure of a beam and a column in a prestressed concrete structure which is prestressed and tension-fixed to the precast concrete column, a girder receiving projection of the precast concrete column and a jaw of the end of the precast concrete girder are joined. Provide a filler on the surface and tighten the PC steel wire. Is to the configuration of the symptoms, the filler is a mortar, further filler is to configure a lower intensity than the intensity of the beams and columns.

[0005]

Thus, as described above, the filler is provided on the joint surface between the girder receiving projection of the precast concrete column and the jaw of the end portion of the precast concrete girder, and the PC steel wire is tensioned, When the joint between the column and the beam is subjected to repeated positive and negative loads due to a large earthquake, the joint between the column and the beam acts as a hinge to damage the filler in the joint, thereby absorbing seismic energy.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a beam-column joint structure in a prestressed concrete structure of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a cross-sectional view of a beam-column joint structure in a prestressed concrete structure of the present invention.

As shown in FIG. 1, the beam-to-column joining structure is such that a precast concrete column 1 is erected on a pedestal block M of basic concrete, and a PC steel material 1a or a PC steel wire 1 is used.
Prestressed by the tension of a. The precast concrete pillar 1 is integrally formed with a girder receiving projection 2 at a desired height position in advance, and each pillar is supported on the girder receiving projection 2 by supporting a jaw 4 at an end of the precast concrete girder 3. A girder 3 is installed between the two.

A filling material 5 is provided on the joint surface between the jaw 4 of the precast concrete girder 3 and the girder receiving projection 2 of the precast concrete column 1, and the jaw of the precast concrete girder 3 is provided via the filling material 5. 4 is mounted on the girder receiving projection 2 of the precast concrete pillar 1. The filling material 5 is mortar or the like, and is provided with an appropriate thickness from the upper surface to the front surface of the girder receiving projection 2. Further, as the filler 5, rubber, lead, resin mortar, grout, putty, or a combination thereof can be used in addition to the mortar.

The connection between the precast concrete girder 3 and the precast concrete pillar 1 is made by connecting the PC steel wire 6 to the precast concrete pillar 1,
The tension of the steel wire 6 causes tension and prestress. It should be noted that this tension can be adapted to a large displacement by allowing the PC steel wire 6 to have some allowance and tensioning. That is, the conventional tension is 8 of the yield strength of the PC steel wire 6.
While the tension was 0 to 85%, the present invention is that the tension is 40 to 70% of the proof stress of the PC steel wire 6, and this tension range is the most preferable.

Due to such a constitution, the present invention causes the filling material 5 at the joint between the jaw 4 of the precast concrete girder 3 and the girder receiving projection 2 of the precast concrete column 1 to be broken until the design load during an earthquake. Without resisting, the gate-shaped PC frame structure resists horizontal force during an earthquake. Then, when the seismic force becomes larger than that, the filler 5 in the joint is destroyed, and the original PC rigid frame structure is changed to a precast concrete column and a simple beam of precast concrete to cause an earthquake. Withstand the force.

FIG. 2 shows a state of the joint between the precast concrete girder 3 and the precast concrete column 1 when the seismic force exceeding the design load is applied, and the load is repeatedly positive and negative due to the earthquake exceeding the design load. And, the edge of the precast concrete pillar 1 and the precast concrete girder 3 is cut to serve as a hinge support,
When the seismic force further increases and the deformation of the structure progresses, the filler 5 at the joint is damaged and seismic energy is absorbed, so that the precast concrete pillar 1 maintains a sound state, and the precast concrete girder 3 also functions as a member. It keeps a good condition.

Precast concrete pillar 1
When the filling material 5 is sound, the deformation of the precast concrete pillar 1 is subject to the deformation of the length h of the precast concrete pillar 1 as shown in FIG. When is destroyed, as shown in Fig. 3, the precast concrete pillar 1 is subjected to a deformation of d with respect to the length 2h of the precast concrete pillar 1, so that the stress of the precast concrete pillar 1 is temporarily reduced, and for further deformation, Since the deformation performance is increased, it is possible to follow a large deformation and become safer.

On the other hand, regarding the precast concrete girder 3, when the filler 5 is sound, as shown in FIG. 4, the precast concrete girder 3 receives bending moment against seismic force like the precast concrete column 1. On the other hand, when the filler 5 is destroyed, as shown in FIG.
Is a simple beam received by the large beam receiving projection 2 of the precast concrete column 1 and bears the load, and the beam does not drop due to the connection of the PC steel wire 6.

[0014]

EFFECT OF THE INVENTION A filler is provided on the joint surface between the girder receiving projection of the precast concrete column and the jaw at the end of the precast concrete girder, and the PC steel wire is tensioned to form a joint structure between the beam and the column. , Energy absorption due to plastic deformation of structures in large earthquakes is addressed by the filler at the joints of columns and beams.

The beam-to-column joint structure of the present invention can obtain performance exceeding the energy absorption of the RC structure.

Since the final shape of the structure due to the collapse of the beam end can be set from the beginning, the calculation of the holding strength can be clarified.

Even in the process from fixing the beam end to supporting the hinge, there is no risk of the girder dropping because it is supported by the girder receiving projection of the column.

The structure returns to its original shape even after the collapse of the joint without the collapse of the beam, and the safety against human life is far greater than that of the RC structure.

Even if the amount of PC steel wire is smaller than that of the conventional one, the collapse of the beam can be prevented by the breakage of the filler, so that the economical effect is very large.

Since the force from the beam is not transmitted to the column due to the filling material at the joint surface between the beam and the column cracking or breaking due to an earthquake, destruction of the panel zone can be avoided.

Since the filling material at the joint surface between the beam and the column is cracked or destroyed by the earthquake, the vibration period of the earthquake of the structure is lengthened, so that the impact force is reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a joint structure of a beam and a column.

FIG. 2 is a cross-sectional view showing a state in which the filler is broken.

FIG. 3 is a schematic diagram illustrating a deformed state of a column.

FIG. 4 is a schematic diagram illustrating a deformed state of a beam.

[Explanation of symbols]

 M pedestal 1 Precast concrete column 2 Large beam receiving projection 3 Precast concrete beam 4 Jaw 5 Filler 6 PC steel wire

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[Procedure amendment]

[Submission date] July 7, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Full text

[Correction method] Change

[Correction content]

[Document name] Statement

[Title of Invention] Joint structure of beam and column in prestressed concrete structure

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a beam-column joint structure in a prestressed concrete structure.

[0002]

2. Description of the Related Art Prestressed concrete structures are
The precast concrete girder is installed between the columns by supporting the projection of the end of the precast concrete girder on the girder for receiving the girder of the precast concrete column erected on the foundation, and the precast concrete girder is prestressed by the tension of the PC steel wire. It is stressed and well established. At this time, the concrete strength of columns and girders and the strength of joint mortar are made almost the same. Therefore, such a prestressed concrete structure generally has a significantly higher elastic strength than the RC structure.

[0003]

However, in the prestressed concrete structure as described above, when the high restoring force is subjected to repeated positive and negative loading, the dynamic response is increased and at the same time, it is against a large earthquake. Is said to have low energy consumption capacity due to plastic deformation of structures. The present invention has been made in view of the above problems, and an object thereof is to achieve energy consumption due to plastic deformation of a structure in a large earthquake by damaging a filler in a joint between a column and a beam. It is to provide a beam-column joint structure in a prestressed concrete structure.

[0004]

[Means for Solving the Problems] In order to achieve the above objects, a joint structure of a beam and a column in a prestressed concrete structure of the present invention has a structure in which a large number of precast concrete columns are erected on a concrete foundation. A girder receiving jaw is integrally formed on the concrete column, and a large number of girders are erected between the columns by supporting the projection of the end of the precast concrete girder on the girder receiving jaw, and the precast concrete girder is made of PC steel wire. In a joint structure of a beam and a column in a prestressed concrete structure which is prestressed and tension-fixed to the precast concrete column, a girder receiving jaw of the precast concrete column and a protrusion at the end of the precast concrete girder are joined. The surface is provided with a filler having a strength lower than the strength of the beam and the pillar, and the P Is to the structure, characterized by comprising strained steel wire, it is to configure the filler is mortar.

[0005]

Thus, as described above, the filler is provided on the joint surface between the girder receiving jaw of the precast concrete column and the projection of the end of the precast concrete girder, and the PC steel wire is made to have a tense structure. When the joint between the column and the beam is subjected to repeated positive and negative loads due to a large earthquake, the joint between the column and the beam acts as a hinge to damage the filler in the joint, thereby absorbing seismic energy.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a beam-column joint structure in a prestressed concrete structure of the present invention will be described in detail below with reference to the drawings. FIG. 1 shows a cross-sectional view of a beam-column joint structure in a prestressed concrete structure of the present invention.

As shown in FIG. 1, the beam-to-column joining structure is such that a precast concrete column 1 is erected on a pedestal block M of basic concrete, and a PC steel material 1a or a PC steel wire 1 is used.
Prestressed by the tension of a. On this precast concrete pillar 1, a girder receiving jaw 2 is integrally formed in advance at a desired height position, and on the girder receiving jaw 2, a projection 4 at the end of the precast concrete girder 3 is formed.
A girder 3 is erected between the columns 1 to support the.

A filling material 5 is provided on the joint surface between the projection 4 at the end of the precast concrete girder 3 and the girder receiving jaw 2 of the precast concrete pillar 1, and the precast concrete girder 3 is provided through the filling material 5. An end protrusion 4 is placed on the girder receiving jaw 2 of the precast concrete column 1. The filling material 5 is mortar or the like, and is provided with an appropriate thickness from the upper surface to the front surface of the girder receiving jaw 2. In addition to the mortar, the filler 5 is rubber,
Lead, resin mortar, grout, putty and combinations thereof can also be used.

The connection between the precast concrete girder 3 and the precast concrete pillar 1 is made by connecting the PC steel wire 6 to the precast concrete pillar 1,
The tension of the steel wire 6 causes tension and prestress. It should be noted that this tension can be adapted to a large displacement by allowing the PC steel wire 6 to have some allowance and tensioning. That is, the conventional tension is 8 of the yield strength of the PC steel wire 6.
While the tension was 0 to 85%, the present invention is that the tension is 40 to 70% of the proof stress of the PC steel wire 6, and this tension range is the most preferable.

With such a structure, according to the present invention, up to the design load at the time of an earthquake, the filling material 5 at the joint between the projection 4 at the end of the precast concrete girder 3 and the girder receiving jaw 2 of the precast concrete column 1 is used. It is not destroyed, and its gate-shaped PC frame structure resists horizontal force during an earthquake. Then, when the seismic force becomes larger than that, the filler 5 in the joint is destroyed, and the original PC rigid frame structure is changed to a precast concrete column and a simple beam of precast concrete to cause an earthquake. Withstand the force.

FIG. 2 shows a state of the joint between the precast concrete girder 3 and the precast concrete column 1 when the seismic force exceeding the design load is applied, and the load is repeatedly positive and negative due to the earthquake exceeding the design load. And, the edge of the precast concrete pillar 1 and the precast concrete girder 3 is cut to serve as a hinge support,
When the seismic force further increases and the deformation of the structure progresses, the precast concrete pillar 1 maintains a sound state by damaging the filling material 5 at the joint and absorbing the seismic energy, and the precast concrete girder 3 is also a member. I am in good health.

Precast concrete pillar 1
When the filling material 5 is sound, the deformation of the precast concrete pillar 1 is subject to the deformation of the length h of the precast concrete pillar 1 as shown in FIG. When is destroyed, as shown in Fig. 3, the precast concrete pillar 1 is subjected to a deformation of d with respect to the length 2h of the precast concrete pillar 1, so that the stress of the precast concrete pillar 1 is temporarily reduced, and for further deformation, Since the deformation performance is increased, it is possible to follow a large deformation and become safer.

On the other hand, regarding the precast concrete girder 3, when the filler 5 is sound, as shown in FIG. 4, the precast concrete girder 3 receives bending moment against seismic force like the precast concrete column 1. On the other hand, when the filler 5 is destroyed, as shown in FIG.
Is a simple beam received by the large beam receiving jaw 2 of the precast concrete column 1 and bears the load, and the beam does not fall due to the connection of the PC steel wire 6.

[0014]

EFFECT OF THE INVENTION A filler is provided on the joint surface between the girder receiving jaw of the precast concrete column and the projection at the end of the precast concrete girder, and the PC steel wire is tensioned to form a joint structure between the beam and the column. , Energy absorption due to plastic deformation of structures in large earthquakes is addressed by the filler at the joints of columns and beams.

The beam-to-column joint structure of the present invention can obtain performance exceeding the energy absorption of the RC structure.

Since the final shape of the structure due to the collapse of the beam end can be set from the beginning, the calculation of the holding strength can be clarified.

In the process from fixing the beam end to supporting the hinge, there is no risk of the girder dropping because it is supported by the girder receiving jaw of the column.

The structure returns to its original shape even after the collapse of the joint without the collapse of the beam, and the safety against human life is far greater than that of the RC structure.

Even if the amount of PC steel wire is smaller than that of the conventional one, the collapse of the beam can be prevented by the breakage of the filler, so that the economical effect is very large.

Since the force from the beam is not transmitted to the column due to the filling material at the joint surface between the beam and the column cracking or breaking due to an earthquake, destruction of the panel zone can be avoided.

Since the filling material at the joint surface between the beam and the column is cracked or destroyed by the earthquake, the vibration period of the earthquake of the structure is lengthened, so that the impact force is reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a joint structure of a beam and a column.

FIG. 2 is a cross-sectional view showing a state in which the filler is broken.

FIG. 3 is a schematic diagram illustrating a deformed state of a column.

FIG. 4 is a schematic diagram illustrating a deformed state of a beam.

[Explanation of symbols] M pedestal 1 Precast concrete column 2 Large beam receiving jaw 3 Precast concrete beam 4 Protrusion 5 Filler 6 PC steel wire

Claims (2)

[Claims] 1. A large number of precast concrete columns are erected on a concrete foundation, and projections for girder reception are integrally formed on the precast concrete columns, and the projections for receiving girders support the jaws of the ends of the precast concrete girders. Then, a large number of girders are erected between the columns, and the precast concrete girders are prestressed by PC steel wire and tension-fixed to the precast concrete columns. The PC steel wire is tensioned by providing a filler having a strength lower than the strength of the beam and the pillar on the joint surface between the projection for receiving the girder of the precast concrete pillar and the jaw of the end of the precast concrete pillar. Beam-column joint structure for prestressed concrete structures. 2. The beam-to-column joint structure in a prestressed concrete structure according to claim 1, wherein the filler is mortar.