JPH0485424A - Reinforcing bar arrangement structure in column/beam connection section - Google Patents

Abstract

PURPOSE:To prevent shearing breaking from generating by arranging steel plates having reinforcement inserting holes at beam end sections outside column crossing surfaces, to insert the end sections of beam main-reinforcements formed with pressing reinforcements, through the steel plates, and by tightening both the surfaces of the steel plates with a pair of nuts. CONSTITUTION:On arranging beam main-reinforcements 2 formed with pressing reinforcements, steel plates 3 having reinforcement inserting holes are penetrated with member end sections. Besides, on both the sides, nuts 4 are spirally fitted on the beam main-reinforcements 2, and from each one end of beams B to the other ends across column/beam connection sections, the beam main-reinforcements 2 are arranged, and the steel plates 3 are arranged at the specified positions of beam end sections outside column/beam crossing surfaces. After that, with a pair of nuts 4, 4, the steel plate 5 is tightened from both the sides, and the steel plates 3 and the beam main-reinforcements 2 are integrally formed. As a result, a force bearing on the beam main-reinforcements 2 at both the ends of jointing sections is balanced with a concrete compressing reaction force R bearing on the steel plates 3, and shearing breaking can be prevented from being generated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a steel reinforced concrete beam and a reinforcement structure at a joint between a reinforced concrete beam and a column.

(Prior Art) In steel-frame reinforced concrete beams and reinforced concrete beams, beam reinforcement is passed through from one end to the other end beyond the column-beam joint.

(Issues to be solved by the invention!) In the conventional reinforcement structure, the beam reinforcements slip within the column-beam joint, and the hysteresis curve exhibits a slip-type unstable shape.
Furthermore, due to shear failure at joints and deterioration of the adhesion of beam reinforcement, the size of the column cross section is often determined by the yield strength of the beam-column joints.

The present invention was proposed in view of the problems of the prior art, and its purpose is to prevent shear failure of column-beam joints and deterioration of adhesion of beam reinforcements within the joints, and to maintain stability. The purpose of this invention is to provide a reinforcement structure in column-beam joints that provides great characteristics in terms of hysteresis curve and hysteresis energy consumption.

(Means for Solving the Problems) In order to achieve the above-mentioned object, the reinforcement structure in the column-beam joint according to the present invention is provided such that the reinforcement structure in the column-beam joint of a concrete structure is such that the beam ends outside the column intersection plane are A steel plate having a reinforcing bar insertion hole is provided in the steel plate, and the ends of the beam main reinforcement made of threaded reinforcing bars are inserted into the steel plate, and a pair of screws are screwed on both sides of the beam main reinforcement on both sides of the steel plate. It is constructed by tightening both sides of the steel plate with nuts.

(Function) When a reverse symmetrical load such as an earthquake load acts on the column-beam joint, one end of the beam reinforcement in the joint receives a tensile force, the other end receives a compressive force, and a shear force due to a moment is applied to the joint. This force also causes a deterioration of the adhesive strength of the beam reinforcement.

In the present invention, as described above, the end of the main beam reinforcement, which is composed of threaded reinforcing bars, is inserted into the steel plate disposed at the end of the beam outside the column-beam intersection plane, and the steel plate Since the steel plate is tightened by a pair of nuts threaded onto the main beam reinforcement on both sides of the column, the force received by the main beam reinforcement at both ends of the column-beam joint is balanced with the compressive reaction force of the concrete applied to the steel plate surface. , the force input directly into the beam-column joint from the main beam reinforcement becomes extremely small.

(Example) The present invention will be described below with reference to the illustrated embodiments.

(2) and (marks) are steel-framed reinforced concrete or reinforced concrete columns and beams, respectively, and column reinforcements (1) and stirrups (not shown) are built in between the studs.

The beam (I31) is provided with upper and lower main beam reinforcements (2) made of threaded reinforcing bars.

When arranging reinforcement for the beam main reinforcement (2), it is necessary to pass through the steel plate (3) that has a reinforcement insertion hole at the end of the beam, and
Attach nuts (4) to the beam main reinforcement (2) on both sides of the
The main beam reinforcement (2) is arranged from one end of the beam to the other end beyond the column-beam joint, and then the cost reinforcement (not shown) is arranged, and the steel plate is (3) is placed at a predetermined position on the beam end outside the column-beam intersection plane, and the - twin nuts (41 (4
) to integrate the steel plate (3) and the beam main reinforcement (2) by tightening the steel plate (3) from both sides.

Two steel plates (3) are installed at the end of the beam, and separate steel plates (3) are attached to the upper and lower beam main reinforcements.

When a reverse symmetrical load such as an earthquake load is applied, one end of the main beam reinforcement (2) in the column-beam joint experiences a tensile force T,, T! The other end receives a compressive force C,,C, which is input into the column-beam joint as a shear force τ due to a moment.

This force also causes deterioration of the adhesive force of the beam main reinforcement (2).

In conventional through-reinforcement, the main beam reinforcement (
2) The force received by the beam directly transmits through the reinforcing bars and is input into the column-beam joint, causing shear failure at the column-beam joint and deterioration of the adhesive strength of the beam main reinforcement, causing the beam main reinforcement to slip within the column-beam joint, and reducing the history. The curve becomes slip-type and unstable.

However, according to the embodiment, the force applied to the beam main reinforcements (2) at both ends of the column-beam joint is balanced with the concrete compression reaction force R applied to the entire area of the steel plate (3), and the force applied to the beam main reinforcements (2) directly from the beam main reinforcements (2) The force input into the beam joint becomes extremely small.

As a result, beam yield can be easily preceded before shear failure occurs at the column-beam joint, making it possible to design an entire structure that collapses due to beam collapse.

Furthermore, a stable history curve can be obtained by reducing the slippage of the beam main reinforcement (2) within the column-beam joint.

Furthermore, due to shear failure at the column-beam joints and deterioration of the adhesion of the beam reinforcement, the size of the column cross-section is determined by the strength of the joints, compared to the conventional reinforcement structure described above, which reduces the size of the column cross-section. It will be done.

(Effects of the Invention) According to the present invention, as described above, a steel plate having a reinforcing bar insertion hole is provided at the end of the beam outside the column intersection plane at the column joint, and the end of the main beam reinforcement made of threaded reinforcing bars is provided. By inserting the section into the steel plate and tightening both sides of the steel plate with a pair of nuts screwed on both sides of the steel plate in the main reinforcement of the beam, the beam can be removed before shear failure occurs at the column-beam joint. This makes it easier to advance yielding, reduces the slippage of the beam reinforcement within the joint, provides a stable history curve, and reduces the cross section of the column.

[Brief explanation of the drawing]

Fig. 1 is a cross-sectional plan view showing one embodiment of the reinforcement structure at the column-beam joint according to the present invention, and Fig. 2 is a view taken from the arrows ■-■ in Fig. 1.
It is a diagram. (2)...Column, +81...Beam, (1)
...Column reinforcement, (2)...Beam main reinforcement, (3)...Steel plate, (4)...Natsu. Agent: Patent attorney Shige Okamoto (1 person)

Claims (1)

[Claims] At the column-beam joint of a concrete-based structure, a steel plate with reinforcing bar insertion holes is provided at the end of the beam outside the column intersection plane, and the end of the main beam reinforcement made of threaded reinforcing bar is inserted into the steel plate. and a reinforcement structure in a column-beam joint, characterized in that both sides of the steel plate are tightened by a pair of nuts screwed on both sides of the main beam reinforcement with the steel plate sandwiched therebetween.