CN210086482U - Laminated column concrete beam node structure - Google Patents

Abstract

It relates to a superimposed column concrete beam joint structure, comprising: a concrete-filled steel tube superimposed column or a sectioned steel concrete column, a concrete beam and an annular steel bar or steel strip; It is arranged in a CFST superimposed column or a sectioned steel concrete column, and the longitudinal reinforcement of the concrete beam is clamped to an annular steel bar or steel belt and anchored in the CFST superimposed column or sectioned steel concrete column. The ring-shaped steel bar or steel strip is used as the anchoring bar of the stressed longitudinal bar. The stressed longitudinal bar passes the main tension force through the ring-shaped steel bar or steel strip and bypasses the steel pipe or section steel. The force transmission path is clear and the force is reliable. The beam-column joint has good seismic performance. , to avoid the complex structure that the stressed longitudinal bars need to pass through the steel pipe or section steel, and to avoid the difficulty of pouring concrete due to the steel bar or section steel passing through the steel pipe. The construction is convenient and the flexibility of node design is improved.

Description

A composite column concrete beam joint structure

technical field

The utility model relates to the field of building structures, in particular to a superimposed column concrete beam joint structure.

Background technique

Concrete-filled steel tubular composite columns and steel-reinforced concrete columns have been widely used in high-rise buildings and large industrial plants, and have achieved significant economic benefits. However, the existing connection joints of the CFST composite column or the section steel concrete column and the concrete beam are complicated in structure and inconvenient in construction, which limits the popularization and use of the structure. Subject to the structural requirements of the seismic anchorage length of the straight anchor section in which the stressed longitudinal reinforcement of the concrete beam extends into the CFST composite column or the section steel concrete column, there are generally three ways to anchor the stressed longitudinal reinforcement of the concrete beam: one is to The longitudinal reinforcement of the concrete beam passes through the embedded steel tube to restrain the concrete or section steel. There are many penetrating steel bars, the concrete pouring in the tube is difficult, the construction period is long, and the opening of the steel tube or section steel affects the bearing capacity of the laminated column; the second is to reduce the The steel tube constrains the section size of concrete or section steel to ensure the width of the outer concrete section. If the diameter of the steel tube is too small, it is not conducive to the pouring of concrete, and also restricts the bearing capacity of the concrete composite column. The flexibility of the design of the composite column section is greater. The third is to weld the reinforced steel plate or corbel on the outer side wall of the steel pipe or section steel, and the longitudinal reinforcement of the concrete beam passes through the reinforced steel plate or is anchored on the steel plate. high. This paper proposes a concrete-filled steel tubular composite column or a steel-reinforced concrete column-concrete beam joint with reasonable longitudinal reinforcement at the end of the concrete beam, clear force, simple anchoring structure and convenient construction, which has great engineering application value.

Utility model content

Aiming at the technical problems existing in the prior art, the purpose of the utility model is to provide a superimposed column

Concrete beam joint construction. In this beam-column joint structure, by setting annular reinforcement bars or steel strips as anchoring bars for longitudinal reinforcement under stress, it is easy to realize strong joints, ensure the seismic performance of connecting joints, and significantly improve the design flexibility of beam-column joints.

In order to achieve the above purpose, the utility model adopts the following technical solutions:

A superimposed column concrete beam joint structure, comprising: a concrete-filled steel tube superimposed column or a sectioned steel concrete column, a concrete beam and an annular steel bar or steel strip; In the CFST composite column or the sectioned steel concrete column, the longitudinal reinforcement of the concrete beam is clamped to the annular steel bar or steel belt and anchored in the CFST composite column or the sectioned steel concrete column, and the stressed longitudinal reinforcement passes through the annular reinforcement or steel strip. The belt transmits the main tension. After adopting this beam-column joint structure, the longitudinal reinforcement of the concrete beams anchored by the ring-shaped steel bars or steel belt buckles arranged in the CFST composite column or the section steel concrete column can ensure the seismic performance of the connection nodes and give full play to the internal structure. The bearing capacity of the concrete or section steel is restrained by the embedded steel tube. The straight anchor section of the longitudinal reinforcement extending into the column does not need to pass through the embedded steel pipe or section steel in order to meet the structural requirements of the seismic anchorage length, and there is no need to weld the connection of the longitudinal reinforcement of the concrete beam on the outer side wall of the steel pipe or section steel. Reinforced steel plate.

Preferably, the column core of the CFST superimposed column is steel tube, and the column core of the profiled steel concrete column is profiled steel; the annular reinforcement or steel strip is located on the periphery of the profiled steel or steel pipe.

Preferably, the stressed longitudinal reinforcement of the concrete beam is fastened to one end of the annular reinforcement bar or steel strip and welded with a short reinforcement bar for clipping on the annular reinforcement reinforcement or the steel strip; the length of the double-sided fillet weld of the short reinforcement bar is determined by The calculated tensile force of the stressed longitudinal reinforcement is determined; when the diameter of the short steel bar is the same as that of the stressed longitudinal reinforcement, the length of the double-sided fillet weld shall not be less than 5 times the diameter of the stressed longitudinal reinforcement; the number of horizontal reinforcement of the ring reinforcement No more than 3, the net distance between the annular parallel bars should not be less than 30mm, and greater than or equal to 1.5 times the diameter of the annular bars. After adopting this structure, the reliable anchoring of the stressed longitudinal reinforcement at the end of the concrete beam can be effectively realized, the bonding and sliding of the stressed longitudinal reinforcement in the CFST composite column or the profiled steel concrete column can be suppressed, and the concrete pouring is convenient. Use double-sided fillet welded short steel bars to anchor the stressed longitudinal bars, and the construction operation is very simple.

Preferably, the stressed longitudinal reinforcement of the concrete beam is spot welded and fixed with the annular reinforcement bar or the steel strip to form a spot welding clip anchoring structure.

Preferably, the end of the stressed longitudinal reinforcement of the concrete beam is vertically bent into the CFST composite column or the sectioned steel concrete column around the annular steel bar or the steel strip, and the stressed longitudinal reinforcement of the beam surface and the stressed longitudinal reinforcement of the beam bottom are respectively It is staggered and vertically bent to the bottom and top of the concrete beam to form an "L"-shaped bending clip anchoring structure.

Preferably, the end of the longitudinal reinforcement of the concrete beam is vertically bent around the circular steel bar or the steel strip in the CFST composite column or the sectioned steel concrete column, and the longitudinal reinforcement of the beam surface and the longitudinal reinforcement of the beam bottom are respectively bent vertically. Fold until the ends of the two overlap, or the longitudinal reinforcement of the beam surface and the longitudinal reinforcement of the beam bottom are full-length reinforcement, forming a "[" type bending buckle anchoring structure.

Preferably, the cross-sectional area of the annular reinforcement and the steel strip is determined by calculating the tensile force of the longitudinal reinforcement of the concrete beam. After adopting this structure, the cross-sectional area of the annular reinforcement or steel strip is determined according to the requirements, and the longitudinal reinforcement of the concrete beam can be reliably anchored in the CFST composite column or the sectioned steel concrete column, which is easy to realize the seismic structure requirements of the strong joint.

Preferably, the CFST superimposed column can be circular, square or rectangular, and the embedded steel pipe can be circular, square or rectangular; the reinforced concrete column can be a combination of ┼-shaped steel, I-shaped steel, steel pipe and shaped steel. . After adopting this structure, the design of the CFST composite column or the profiled steel concrete column is flexible and has high versatility.

A construction method for a superimposed column concrete beam joint structure, comprising the following steps: S1: determining the cross-sectional area of a ring-shaped steel bar or a steel strip and the diameter, quantity, and paralleling spacing of the ring-shaped steel bars used according to the stressed longitudinal reinforcement of the concrete beam; Determine the diameter of the ring of the annular reinforcement or steel strip; S2: Determine the length of the longitudinal reinforcement extending into the CFST composite column or the sectioned steel concrete column, which can meet the spot welding clip anchoring structure or bending clip of the stressed longitudinal reinforcement. The requirements for the buckle anchor structure; the spot welding anchor structure is adopted, and the short fillet welded steel bars are attached to the ends of the stressed longitudinal bars on both sides; S3: The annular steel bars or steel strips are installed over the steel pipes or profiles, and the stressed longitudinal bars extend into the annular steel bars or The inner side of the steel belt; the L-shaped bending buckle anchoring structure is adopted, the longitudinal reinforcement of the beam surface is bent vertically to the bottom of the beam by bypassing the circular reinforcement or steel strip, and the longitudinal reinforcement of the beam bottom bypasses the circular reinforcement or steel strip Bend vertically to the top of the beam; adopt the [-shaped bending buckle anchoring structure, the longitudinal reinforcement of the beam surface and the longitudinal reinforcement of the beam bottom are respectively bent vertically until the ends of the two overlap, or the longitudinal reinforcement of the beam surface is stressed. The longitudinal reinforcement of the reinforcement and the bottom of the beam adopts the full-length reinforcement; the annular reinforcement or steel strip is spot welded with the longitudinal reinforcement and fixed to form; S4: On-site installation of the concrete-filled steel tubular composite column or the formwork of the steel-concrete column and the formwork of the concrete beam; S5: Concrete is poured to form an overall rigid concrete-filled steel tubular composite column or a steel-concrete column-concrete beam connection node.

Preferably, when the annular reinforcing bar or steel strip is sleeved on the steel pipe or section steel in step S3, it is necessary to determine the distance between the inner side of the ring of the annular reinforcing bar or steel strip and the outer side wall of the steel tube or section steel, so as to satisfy the spot welding buckle of the stressed longitudinal reinforcement. Requirements for the anchoring structure or the anchoring structure of the bending clip; in step S4, it is necessary to ensure that there is sufficient concrete protective layer thickness on the outer side of the ring of the annular steel bar or the steel strip.

The principle of the utility model is as follows: a ring-shaped steel bar or a steel strip is added in the steel-filled concrete superimposed column or the profiled-steel-concrete column; The stressed longitudinal reinforcement of the concrete beam is anchored in the concrete outside the CFST composite column or the section steel concrete column through the ring reinforcement or steel belt buckle, so as to realize the reliable seismic anchoring of the stressed longitudinal reinforcement, and solve the problem that the concrete beam extends into the CFST composite column. The technical problem that the straight anchor section of the longitudinal reinforcement of the steel or section steel column does not meet the requirements of the seismic anchoring structure; avoid the longitudinal reinforcement of the concrete beam passing through the embedded steel tube to restrain the concrete or section steel; avoid setting the connection in the steel tube or section steel welding The steel corbels or annular steel plates of the longitudinal reinforcement of the concrete beam; avoid increasing the thickness of the outer concrete of the steel pipe or section steel to ensure the anchorage length of the reinforcement.

In general, the utility model has the following advantages:

1. The stress longitudinal bars of concrete beams are anchored by ring steel bars or steel belt buckles. The joint structure is simple and the stress is clear. Construction constraints required by the segment. The steel pipe or section steel in the annular reinforcement or steel strip has no shape requirements, and the cross-sectional size of the steel pipe or section steel in the CFST composite column or the section steel column can be flexibly designed to meet the design of different bearing capacities of the CFST composite column or the section steel concrete column. It has high versatility and can improve the spatial adaptability of beam-column joints.

2. The longitudinal reinforcement of the concrete beam in the node does not need to pass through the embedded steel tube to restrain the concrete or section steel, and the section of the steel tube or section steel is not weakened, which ensures the bearing capacity of the CFST composite column or the section steel concrete column in the node area; the concrete beam The beam end bending moment and shear force can be transmitted reasonably and reliably, and the bearing capacity has a high safety reserve; the overall seismic performance of the joint is good, and the seismic design principle of "strong joint and weak member" can be fully guaranteed.

3. The longitudinal reinforcement of the concrete beam in the node does not need to pass through the embedded steel tube to restrain the concrete or section steel, and the outer side wall of the steel tube or section steel does not need to weld stiffening plates or other connectors, which can greatly simplify the joint construction and significantly reduce the on-site welding workload. , reduce construction difficulty, improve construction efficiency, and save the construction cost and construction cost of beam-column joints.

4. The beam-column joint structure has a wide range of applications. The structure of the longitudinal reinforcement of the concrete beam anchored by the steel bar or the steel belt can be extended to the concrete-filled steel tube column-concrete ring beam node, the concrete-filled steel tube shear wall-concrete coupling beam node , section steel concrete shear wall - concrete coupling beam joints, etc.

Description of drawings

FIG. 1 is a top view of a square stacked column containing a circular steel tube concrete.

Figure 2 is a top view of a concrete square column containing a ┼-shaped steel.

FIG. 3 is a schematic cross-sectional structural diagram of the spot welding clip anchoring structure of the annular steel bar or steel strip in FIG. 1 and FIG. 2 .

Fig. 4 is a detailed view of the construction at A in Fig. 3 (an annular bar or strip).

FIG. 5 is a schematic cross-sectional structural diagram of the L-shaped bending clip anchoring structure of the annular steel bar or steel belt clip in FIG. 1 and FIG. 2 .

Fig. 6 is a detailed view of the construction at B in Fig. 5 (an annular bar or strip).

FIG. 7 is a schematic cross-sectional structural diagram of the anchoring structure of the annular steel bar or steel belt buckle [shaped bending buckle in FIG. 1 and FIG. 2 .

Fig. 8 is a detailed view of the construction at C in Fig. 7 (an annular bar or strip).

Fig. 9 is a plan view of a square stacked column containing square steel tubular concrete.

Fig. 10 is a plan view of a circular stacked column containing a circular steel tube concrete.

FIG. 11 is a plan view of a circular stacked column containing square steel tube concrete.

Figure 12 is a top view of a concrete square column with I-shaped steel.

Figure 13 is a top view of a concrete circular column with a ┼ shaped steel.

The labels and corresponding parts names in the figure are: 1 is a square superimposed column, 2 is a round steel pipe, 3 is a ring steel bar, 4 is a ring steel strip, 5 is a concrete beam, 6 is a stressed longitudinal bar, and 7 is a beam 8 is the longitudinal reinforcement of the beam bottom, 11 is the circular superimposed column, 21 is the square steel pipe, 22 is the ┼-shaped steel, and 23 is the I-shaped steel. In the figure, d is the diameter of the longitudinal reinforcement under force, and h is the length of the vertical section (h≥20d).

Detailed ways

The present utility model will be described in further detail below in conjunction with the accompanying drawings.

Example 1

A CFST composite column-concrete beam joint structure, as shown in Figure 1, Figure 3, Figure 4, includes: CFST composite columns, concrete beams, and annular steel bars or steel strips. The ring-shaped steel bar is centrally symmetrical and annular, and the sleeve is fixed on the periphery of the round steel pipe, and is arranged coaxially with the CFST superimposed column. , the longitudinal reinforcement transmits the main tensile force through the annular reinforcement or steel belt. A section of short steel bar is welded at the end of the stressed longitudinal bar. The diameter of the short steel bar is equal to the diameter of the stressed longitudinal bar (d=20mm). The length of the double-sided fillet weld is equal to 100mm. On the longitudinal rib, a spot welding buckle anchoring structure is formed. Two ring steel bars are used, and the net distance between the ring bars is equal to 30mm.

The construction method of the beam joint structure includes the following steps:

S1: According to the longitudinal reinforcement of the concrete beam, determine the cross-sectional area of the annular reinforcement or steel strip, and the diameter, quantity, and spacing of the annular reinforcement used; The wall has sufficient spacing to meet the requirements of spot welding clip anchoring structure of the stressed longitudinal reinforcement of the concrete beam; the outer side of the annular reinforcement has sufficient concrete protective layer thickness.

S2: Determine the length of the stressed longitudinal reinforcement extending into the CFST composite column, which can meet the requirements of the spot welding clip anchoring structure of the stressed longitudinal reinforcement; the spot welding anchoring structure is adopted, and the ends of the stressed longitudinal reinforcement are angled on both sides Weld short bars.

S3: The annular steel bar or steel belt is installed over the steel pipe or section steel, and the stressed longitudinal reinforcement extends into the inner side of the annular steel reinforcement or steel belt; the annular steel reinforcement and the stressed longitudinal reinforcement of the concrete beam are spot welded and fixed into shape.

S4: On-site installation of the formwork of the CFST composite column and the formwork of the concrete beam.

S5: Concrete is poured to form an overall rigid concrete-filled steel tubular composite column-concrete beam connection node.

Embodiment 2

As shown in Figure 1, Figure 5 and Figure 6, a short steel bar is welded at the end of the longitudinal reinforcement of the concrete beam. The diameter of the short reinforcement is equal to the diameter of the longitudinal reinforcement (d=20mm), and the double-sided fillet weld The length is equal to 100mm, and the longitudinal reinforcement of the force bypasses the annular steel belt, and is vertically bent in the concrete-filled steel tube superimposed column to form an L-shaped bending buckle anchoring structure. The longitudinal reinforcement of the beam surface and the longitudinal reinforcement of the beam bottom are bent vertically to the beam bottom and the beam top respectively, and the length of the vertical section is equal to 400mm. Cross-sectional area of annular reinforcement or strip = 700 mm ² .

The construction method of the beam joint structure includes the following steps:

S1: According to the longitudinal reinforcement of the concrete beam, determine the cross-sectional area of the annular reinforcement or steel strip, and the diameter, quantity, and spacing of the annular reinforcement used; The walls have sufficient spacing to meet the requirements of the bending clip anchorage structure of the longitudinal reinforcement of the concrete beam; the outer side of the annular reinforcement has sufficient concrete protective layer thickness.

S2: Determine the length of the stressed longitudinal reinforcement extending into the CFST superimposed column, which can meet the requirements of the bending clip anchorage structure of the stressed longitudinal reinforcement; adopt the L-shaped bending clip anchorage structure, and the stressed longitudinal reinforcement on the beam surface Bend vertically to the bottom of the beam around the annular reinforcement or steel strip, and the longitudinal reinforcement at the bottom of the beam bypasses the annular reinforcement or steel strip to bend vertically to the top of the beam.

S3: The annular steel bar or steel belt is installed over the steel pipe or section steel, and the stressed longitudinal reinforcement extends into the inner side of the annular steel reinforcement or steel belt; the annular steel reinforcement and the stressed longitudinal reinforcement of the concrete beam are spot welded and fixed into shape.

S4: On-site installation of concrete-filled steel tubular composite column formwork and concrete beam formwork.

S5: Concrete is poured to form an overall rigid concrete-filled steel tubular composite column-concrete beam connection node.

The parts not mentioned in this embodiment are the same as those in the first embodiment, and are not repeated here.

Embodiment 3

As shown in Figure 1, Figure 7, and Figure 8, the longitudinal reinforcement of the concrete beam is a full-length steel bar in the CFST composite column, which is vertically bent and extended into the CFST composite column around the annular steel strip, forming [ Shaped bending buckle anchoring structure.

The construction method of the beam joint structure includes the following steps:

S1: According to the longitudinal reinforcement of the concrete beam, determine the cross-sectional area of the annular reinforcement or steel strip, and the diameter, quantity, and spacing of the annular reinforcement used; The walls have sufficient spacing to meet the requirements of the bending clip anchorage structure of the longitudinal reinforcement of the concrete beam; the outer side of the annular reinforcement has sufficient concrete protective layer thickness.

S2: Determine the length of the stressed longitudinal reinforcement extending into the CFST superimposed column, which can meet the requirements of the bending clip anchorage structure of the stressed longitudinal reinforcement; The longitudinal reinforcement and the longitudinal reinforcement at the bottom of the beam are respectively bent vertically around the annular reinforcement or steel strip.

S3: The annular steel bar or steel belt is installed over the steel pipe or section steel, and the stressed longitudinal reinforcement extends into the inner side of the annular steel reinforcement or steel belt; the annular steel reinforcement and the stressed longitudinal reinforcement of the concrete beam are spot welded and fixed into shape.

S4: On-site installation of concrete-filled steel tubular composite column formwork and concrete beam formwork.

S5: Concrete is poured to form an overall rigid concrete-filled steel tubular composite column-concrete beam connection node.

The parts not mentioned in this embodiment are the same as those in the first embodiment, and are not repeated here.

In addition to the methods mentioned in the above embodiments, as shown in FIGS. 9-13 , the steel pipe can also be a square steel pipe, the superimposed column can also be a square shape, and the profile steel can be I-shaped steel or ┼-shaped steel. These transformation modes are all within the protection scope of the present invention.

The above-mentioned embodiments are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited by the above-mentioned embodiments, and any other changes, modifications, and substitutions made without departing from the spirit and principle of the present utility model , combination and simplification, all should be equivalent replacement methods, which are all included in the protection scope of the present invention.

Claims (8)

1. a superimposed column concrete beam joint structure, is characterized in that, comprises: steel pipe concrete superposed column or section steel concrete column, concrete beam and annular reinforcement or steel strip; annular reinforcement or steel strip and steel tubular superposition column or section steel The concrete column is arranged in the CFST composite column or the sectioned steel concrete column in the same axial direction, and the longitudinal reinforcement of the concrete beam is clamped to the annular steel bar or steel belt and anchored in the CFST composite column or the sectioned steel concrete column. The tendons transmit the main tensile force through annular bars or strips. 2. according to the described superimposed column concrete beam joint structure of claim 1, it is characterized in that: the column core of the CFST superimposed column is steel tube, and the column core of the section steel concrete column is section steel; Inside the concrete surrounding the steel tube. 3. The superimposed column concrete beam joint structure according to claim 1 is characterized in that: the stressed longitudinal reinforcement of the concrete beam is fastened to one end of the annular reinforcement bar or the steel strip and welded with a section for clipping to the annular reinforcement bar or the steel strip. The short steel bar on the belt; the length of the double-sided fillet weld of the short steel bar is determined by the calculated tensile force of the longitudinal reinforcement; when the diameter of the short steel bar is the same as the diameter of the longitudinal reinforcement, the length of the double-sided fillet weld It is not less than 5 times the diameter of the longitudinal reinforcement under stress; the number of horizontal reinforcement of the annular reinforcement is not more than 3, and the net distance between the annular reinforcements should not be less than 30mm, and greater than or equal to 1.5 times the diameter of the annular reinforcement. 4 . The superimposed column concrete beam joint structure according to claim 3 , wherein the stress-bearing longitudinal bars of the concrete beam are spot welded and fixed with the annular reinforcing bars or steel strips to form a spot welding clip anchoring structure. 5 . 5. The superimposed column concrete beam joint structure according to claim 3 is characterized in that: the end of the stressed longitudinal reinforcement of the concrete beam is vertically bent on the CFST superimposed column or the section steel concrete column by bypassing the annular reinforcement or the steel strip. Inside, the longitudinal reinforcement of the beam surface and the longitudinal reinforcement of the beam bottom are staggered and vertically bent to the beam bottom and beam top of the concrete beam respectively, forming an "L"-shaped bending buckle anchoring structure. 6. The superimposed column concrete beam joint structure according to claim 1 is characterized in that: the end of the stressed longitudinal reinforcement of the concrete beam is vertically bent on the CFST superimposed column or the profiled steel concrete by bypassing the annular reinforcement or the steel strip. In the column, the longitudinal reinforcement of the beam surface and the longitudinal reinforcement of the beam bottom are respectively bent vertically until the ends of the two overlap, or the longitudinal reinforcement of the beam surface and the longitudinal reinforcement of the beam bottom are full-length reinforcement, A "[" type bending buckle anchoring structure is formed. 7 . The superimposed column concrete beam joint structure according to claim 1 , wherein the cross-sectional area of the annular reinforcement bar and the steel strip is determined by calculating the tensile force of the stressed longitudinal reinforcement. 8 . 8. The superimposed column concrete beam joint structure according to claim 2 is characterized in that: the CFST superposed column is a circle, a square or a rectangle, the embedded steel pipe is a circle, a square or a rectangle; the profiled steel concrete column is a Shaped steel, I-shaped steel, steel pipe and shape of various combinations of steel.

Images