KR20010078528A - Steel joint method of reinforced concrete columns and preflex beams - Google Patents

Abstract

PURPOSE: A method for rigidly joining steel concrete and a preflex composite beam is provided to safely and economically construct the preflex composite beam, to integrate a beam-column joint, and to reduce the amount of members by fixing both ends of the preflex beam. CONSTITUTION: A SB(Steel Bracket) type joint method includes the steps of constructing a cross-shaped steel-frame beam or T-shaped steel-frame beam at a joint in joining a preflex beam(1) and a RC(Reinforced Concrete) column(2), and connecting the preflex beam after a column concrete is set. An EC(Erection Column) type joint method includes the steps of constructing an erection steel column and the preflex beam, and installing a column and a bottom concrete slab, so that the strength of the joint is increased. An EB(Embedded Beam) type joint method uses a shear connector and a hook bar, or uses the shear connector by welding a steel plate weld at the end of the preflex beam.

Description

Steel Joint Method of Reinforced Concrete Columns and Preflex Beams {.}

A preflex composite beam is a composite structure in which a compressive prestress is introduced into concrete by loading and curing high-strength concrete on the lower flange of the steel beam after loading a design load on the steel beam in advance. However, preflex composite beams are designed as simple beams, so when applied to buildings, in order to resist the horizontal loads such as earthquake loads and wind loads, all lateral forces must be applied to horizontal load resistance elements such as shear walls. As the pre-flex composite beam of the structure is treated as a simple beam support condition, the beam-column joint becomes pinned in the frame so that it is fixed, whereas the lateral load resistance of the structure, the vibration of the bottom plate, and the depth of the composite beam Many structural and functional advantages have to be abandoned.

Therefore, in the present invention, `` SB (Steel Bracket) Type joint '', `` EC (Erection Column) Type joint part by RCS (Reinforced Concrete column-Steel beam) joining method for improving the constructability and economical efficiency at the joint part of the reinforced concrete column and the preflex beam And three construction methods, `` EB (Embedded Beam) Type Joint ''.

The content of the present invention will be described with reference to the following.

1 shows the construction principle of "SB (Steel Bracket) Type joint part". Here, the SB type joints are bracket-shaped &quot; + &quot; for easy construction when joining the preflex beams (1) in Figs. 1, 2 and 3) and the RC pillars 2 &amp; cir &amp; After constructing a steel cheolgolbo (④ of Figure 1) or "T" shaped cheolgolbo <⑤ of Figure 1>, the method of connecting the preflex beam after the column concrete is solidified. Therefore, the process until joining the preflex beam is the same as the RCS method, and the preflex beam is joined to the steel bracket by the steel joint <6> of FIG. 1 as shown in FIG. And there are three major reinforcement measures for the joints of the preflex beams and the concrete columns. First, FBP (Face Bearing Plate, ⑦ of Fig. 1, 2, 3) is a stiffener to reinforce the web of cheolgolbo at the site where the cheolgolbo and the pillar contact. And E-FBP (Extended Face Bearing Plate, ⑨ of Fig. 1, 2, 3) is to use the c-channel or band plate (⑧ of Fig. 1, 2, 3), etc. at the upper and lower ends of the connection between the cheolgolbo and the pillar. Way. In addition, for restraint and shear reinforcement of the panel zone, the hoop rebar <3> of FIGS. 1, 2, and 3 is used for the panel zone. In order to continuously reinforce these hoop reinforcing bars, a method of punching steel webs in a panel zone is generally used.

2 is a construction method that can improve the structural performance, while separating the EC-type joints and steel construction and concrete construction. Therefore, after the construction of the steel column (Erection Steel Column (Fig. 2)) and preflex beams for the pre-installation, the column and floor concrete slab is poured. The structural advantage of the EC method is that it is possible to connect the steel pillars and preflex beams embedded in the pillars with strong joints, thereby increasing the strength of the joints.

EB type joint of FIG. 3 is similar to the general method of inserting a steel member into a concrete column. In the case of EB type joints, two preflex beams can be integrated by welding or bolts in the case of internal joints, but in the case of external joints, appropriate joints should be used. Therefore, as shown in FIG. 3, a method of using a sheath connector and a hook rebar and a method of using a steel plate welded to the end of the preflex beam together with the sheath connector were developed.

The present invention enables the construction of safe and economical preflex composite beams by joining reinforced concrete columns and preflex beams by steel joints, thereby facilitating the integration of preflex beam-reinforced concrete column joints, and at both ends of the preflex beams. By fixing M _o -M _c ( / 24) has the advantage that can reduce the amount of members.

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1 is a principle diagram of the "SB (Steel Bracket) Type junction part" according to the present invention

2 is a principle diagram of the "EC (Erection Column) Type junction" according to the present invention.

3 is a principle diagram of the "EB (Embedded Beam) type junction part" according to the present invention

<Description of the symbols for the main parts of the drawings>

①: Preflex Beam

②: reinforced concrete column

③: junction band

④: "+" Steel Bracket

⑤: "TT" Steel Bracket

⑥: Steel Bracket Joint

⑦: FBP (Face Bearing Plate)

⑧: Band Plate

⑨: E-FBP (Extended-Face Bearing Plate)

⑩: Erection Column

⑪: Plate

⑫: Shear Connector

⑬: Hook Bar

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Claims (1)

In the present invention, three joint methods such as "SB Type", "EC Type", and "EB Type" were developed as a joining method for improving the constructability and economic efficiency at the joint between the RC column and the beam generated in the parent composite beam. Therefore, the scope of the claims is made of the above three joining methods that can be joined to the reinforced concrete column by steel joints.