JPH05280099A - Reinforced construction for joint part of reinforced concrete pillar and steel framed beam - Google Patents

Abstract

PURPOSE:To prevent local bearing breakage by respectively arranging reinforcing iron plates on the lower face of an upper story pillar and the upper face of a lower story pillar which are in contact with the upper and lower flange faces of a steel framed beam in the joining part of pillar and beam. CONSTITUTION:The joining part of pillar and beam B' of a steel framed beam B is provided on the reinforcing iron plate 2 of the precast RC pillar A of a lower story, a formwork is assembled by surrounding the joining part B' with hoop reinforcement 5, and concrete of the joining part B' is placed together with slab concrete. Next, the precast RC pillar A1 of an upper story is built on, a reinforcing iron plate 1 is integratedly fitted to the lower face, the pillar main reinforcement 3 of the pillar A2 is inserted into a splice sleeve 4 and mortar is filled, and hence the main reinforcement 3 of the pillars A1, A2 of the upper and lower stories are connected together. Against the force applied on the joining part B', the average force is transmitted from the beam B to the pillars A1, A2 through the iron plates 1, 2. Hereby, local bearing breakage at the pillars A1, A2 can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure of a joint portion of a column beam composed of a reinforced concrete column (hereinafter referred to as RC column) and a steel frame beam (hereinafter referred to as S beam).

[0002]

2. Description of the Related Art In a composite structure consisting of RC columns and S beams, columns and beam joints which are not specially reinforced are as shown in FIG. 4 and FIG. It becomes a structure.

[0003]

In the conventional column-beam joint in which the S beam b penetrates the RC column a as described above, since the beam width is smaller than the column width, the flange portion of the S beam b is And only a part of the end of each of the upper and lower RC columns a may come into contact with each other, which may locally cause bearing failure. 4 and 5, d is the opening at the end of the column, e is the crushing portion at the end of the column, Q is the column shearing force, M is the column bending moment, Q'is the beam shearing force, and M'is the beam. Bending moment. Further, c is the main pillar muscle.

The present invention has been proposed in view of the above problems of the prior art, and the object of the present invention is to provide the RC
The point is to provide a reinforcing structure for the joint between the RC column and the S-beam that avoids local bearing failure in the RC column at the joint between the column and the S-beam.

[0005]

In order to achieve the above-mentioned object, a reinforcing structure for a joint between an RC column and an S-beam according to the present invention comprises:
In a beam-column joint of a building consisting of reinforced concrete columns and steel beams, reinforcing iron plates are placed on the lower surface of the upper floor column and the upper surface of the lower floor column that contact the upper and lower flange surfaces of the steel beam in the beam-column joint, respectively. Is configured.

[0006]

Since the reinforcing structure for the joint between the RC column and the S-beam according to the present invention is constructed as described above, the S-beam is arranged on the upper and lower surfaces of the RC column against the force acting on the joint. Since the force is transmitted to the column via the reinforcing iron plate provided,
The force is transmitted to the C pillars on average.

[0007]

The present invention will be described below with reference to the illustrated embodiments. A ₁ and A ₂ are precast RC pillars on the upper floor and precast RC pillars on the lower floor, which are manufactured in factories.
Reinforcing iron plates 1 and 2 are integrally attached to the lower surface of the pillar A _{1 and} the upper surface of the RC pillar A _{2 on} the lower floor, respectively. The RC main column 3 of the RC column A ₂ on the lower floor penetrates the beam-column joint, and the RC column A on the upper floor
Splice sleeve 4 fixed to the lower end of _one of the pillars main reinforcement 3
It is configured to be inserted and joined to.

Reference numeral B is an H-shaped steel beam, and a hoop streak 5 is attached to the beam-column joint portion B'of the beam which surrounds the beam portion. At the time of construction, at the beam-column joint, the beam-column joint B'of the RC beam B is installed on the reinforcing iron plate 2 of the RC column A ₁ on the lower floor, and the formwork is assembled around the beam-column joint. , Concrete of beam-column joints is placed together with slab concrete.

Next, an RC column A ₁ on the upper floor is erected on the RC column A ₁ on the upper and lower floors by inserting the column main bar 3 of the RC column A ₂ on the lower floor into the splice sleeve 4 and filling the mortar. , A ₂ of the column main bar 3 is connected. Since the illustrated embodiment is configured as described above, since the S beam B transmits the force to the RC columns A ₁ and A ₂ via the reinforcing iron plates 1 and 2, the S column B is averagely distributed to the RC columns A ₁ and A _2. Force is transmitted to.

Reference numeral 6 in the drawing denotes a local pressure bearing portion.

[0011]

As described above, according to the present invention, in the beam-column joint composed of the RC column and the S-beam, the lower surface of the upper floor column and the lower floor column which are in contact with the upper and lower flange surfaces of the steel beam in the joint portion. With a simple structure in which reinforcing iron plates are arranged on the upper surface of each of the columns, it is possible to avoid local bearing failure due to an average force flowing through the columns.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an example of a reinforcing structure for a joint portion between a reinforced concrete column and a steel frame beam according to the present invention.

FIG. 2 is an arrow view of FIG.

FIG. 3 is a perspective view showing a construction procedure of the reinforcing structure of the present invention.

FIG. 4 is an explanatory diagram showing a destruction mechanism of a conventional structure.

FIG. 5 is a plan view of FIG.

[Explanation of symbols]

A ₁ Upper floor precast RC column A ₂ Lower floor precast RC column B S beam 1 Reinforcing iron plate 2 Reinforcing iron plate 3 Column main bar 4 Splice sleeve 5 Hoop bar 6 Local bearing part

Claims (1)

[Claims] 1. In a beam-column joint of a building composed of a reinforced concrete column and a steel frame beam, for reinforcement on the lower surface of the upper floor column and the upper surface of the lower floor column which contact the upper and lower flange surfaces of the steel beam in the beam-column joint, respectively. A reinforcing structure for a joint between a reinforced concrete column and a steel beam, which is characterized by disposing an iron plate.