A reinforced steel column and ECC concrete composite node and construction method thereof

Abstract

The invention discloses a reinforced steel column and ECC concrete combined node and a construction method thereof. The reinforced steel column and ECC concrete combined node comprises a cross column, four steel beam brackets, four vertically arranged annular hoop plates and ECC concrete cast in the end area of ​​the steel column and the steel beam. Each cross column comprises a cross column web with a cross structure and four cross column flange plates respectively connected to the corresponding ends of the cross column web. The inner end of each steel beam bracket is connected to the corresponding cross column flange plate. Each annular hoop plate is connected between two adjacent steel beam brackets, and each annular hoop plate is provided with a strip through groove. The invention combines the characteristics of steel and ECC concrete, can significantly reduce the number of stirrups and openings while improving the structural performance, is simple to manufacture and convenient to construct.

Description

Technical Field

[0001] The invention relates to the field of steel-concrete structures, in particular to a reinforced steel column and ECC concrete combined node and a construction method thereof. Background Art

[0002] Steel-concrete structures have the characteristics of high bearing capacity and good seismic performance, and are widely used in large public buildings and super high-rise buildings. However, the core area of ​​ordinary steel-concrete beam-column nodes needs to be arranged with denser stirrups to constrain the concrete and ensure that the longitudinal steel bars, steel and concrete work together. The arrangement of stirrups in the core area of ​​the node requires drilling holes in the steel beam, which weakens the bearing capacity of the steel beam. At the same time, the density of stirrups makes it difficult to pour and vibrate the concrete in the core area of ​​the node, making it difficult to ensure the quality of the concrete pouring in the core area of ​​the node, resulting in reduced bearing capacity of the node, easy cracking, and insufficient seismic performance.

[0003] ECC concrete material is a high-performance fiber-reinforced cement-based material. It is an artificial stone made of fly ash, cement, sand and admixtures, and short fibers are added to strengthen and toughen it. It is mixed, molded, cured and hardened. It is a high-performance material with high toughness, high ductility, excellent tensile properties and crack control properties. Since its advent in 1992, after continuous development, the research on ECC concrete materials has become very mature. ECC concrete is widely used in Japan and some developed countries in Europe and the United States, and has achieved good engineering application results. ECC concrete has excellent tensile and crack resistance, but the current application of ECC concrete mostly stays at the component level. How to make full use of ECC concrete materials to improve the design of structural systems remains to be studied. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a reinforced steel column and ECC concrete combined node and a construction method thereof, so as to solve the problem that the stirrups in the core area of ​​the steel concrete beam-column node need to be punched in the steel frame, improve the structural performance and meet the needs of mass production in engineering.

[0005] The technical solution of the present invention is:

[0006] A reinforced steel column and ECC concrete combined node comprises a cross column, four steel beam corbels, four vertically arranged annular hoop plates and ECC concrete cast in the end areas of the steel column and the steel beam, each cross column comprises a cross column web with a cross structure and four cross column flange plates respectively connected to corresponding ends of the cross column web, the inner end of each steel beam corbel is connected to the corresponding cross column flange plate, each annular hoop plate is connected between two adjacent steel beam corbels, and each annular hoop plate is provided with a strip through groove.

[0007] Each of the steel beam corbels includes a horizontally arranged upper flange plate and a lower flange plate, and a steel beam corbel web plate vertically connected between the upper flange plate and the lower flange plate. The upper flange plates of each steel beam corbel are located at the same horizontal height. Among the four steel beam corbels, the lower flange plates of two symmetrically arranged steel beam corbels are located at the same horizontal height, and the two lower flange plates located at the same horizontal height are lower than the other two lower flange plates located at the same horizontal height.

[0008] Each of the annular hoop plates includes a vertically arranged annular plate and two vertically arranged rectangular plates respectively connected to the two ends of the annular plate. The strip-shaped through grooves are arranged at one-third and two-thirds of the height of the annular plate and pass through the two ends of the annular plate. The rectangular plates at both ends of each annular hoop plate extend between the upper flange plate and the lower flange plate of the corresponding steel beam corbel, and are in close contact with the upper flange plate, the lower flange plate and the web plate of the corresponding steel beam corbel and are welded and fixed.

[0009] A vertically arranged oblique connecting plate and two upper and lower horizontally arranged annular connecting plates are welded between the webs of adjacent cross columns. The vertical height of the oblique connecting plate is selected as the smaller value between half of the height of the steel beam and 400mm. The two annular connecting plates are both located below the oblique connecting plate and the horizontal heights of the two annular connecting plates are the same as those of the lower flange plates of two different horizontal heights.

[0010] A right-angled triangle-structured foot support plate is connected between the cross column web plate and the corresponding cross column flange plate of the cross column. Twenty-four foot support plates are connected to the cross column. Every eight foot support plates are located at the same horizontal height, thus divided into three layers of foot support plates. The first layer of foot support plates from top to bottom is located above the oblique connecting plate, the horizontal height of the second layer of foot support plates is equal to the center height between the flange plates at two different horizontal heights, and the third layer of foot support plates is located 100 mm below the flange plate at the lowest horizontal height.

[0011] The two layers of annular connecting plates of different heights on the cross column, each layer of annular connecting plates constitutes an annular plate structure with an octagonal outer circle and a circular inner circle, and the radius of the inner circle is equal to the difference between the horizontal length extending from the center of the cross column web to the cross column flange plate and the length of the right angle side of the foot support plate close to the cross column web.

[0012] The pouring cross-sectional range of the ECC concrete is a distance extending from the entire steel column and the steel beam, and the distance extending from the steel beam is not less than 0.5 times the height of the cross-sectional area of ​​the steel concrete column.

[0013] A construction site of a reinforced steel column and ECC concrete composite node specifically includes the following steps:

[0014] (1) According to the plane projection size of the cross column, draw the center line, outline line and positioning lines of each accessory on the ground, and then set up the tire frame template;

[0015] (2) The cross column is hoisted onto the assembly frame for positioning. After the positioning is correct, welding can be carried out. After welding, correction is performed, and then the oblique connecting plate, annular connecting plate and foot support plate are installed and positioned;

[0016] (3) After positioning, each component shall be self-checked and mutually checked. After passing the inspection, welding can be carried out. After welding, flaw detection and correction shall be carried out. Then, the tire frame shall be assembled as a whole for acceptance of post-weld integrity.

[0017] (4) Lift the node steel frame on site, weld and install the steel beam, tie the steel bars and support the formwork in the same way as ordinary steel concrete. Tie the wire mesh with steel wire at the junction of ECC concrete and ordinary concrete, then pour the ECC concrete first, and then pour the ordinary concrete.

[0018] The steel beam corbel and the annular hoop plate are positioned at their respective installation position lines during installation and verticality to the ground is ensured.

[0019] Advantages of the present invention:

[0020] (1) The present invention adopts a ring hoop plate with strip-shaped through grooves to replace the function of part of the stirrups. The structure is simple and the construction is very convenient. The number of stirrups and openings in the core area of ​​the node is greatly reduced, and the energy dissipation capacity of the node is enhanced.

[0021] (2) The present invention utilizes the superior tensile strength of ECC concrete materials to make the column body have better impact resistance. The use of ECC concrete in the node steel column and beam end can greatly improve the seismic performance of the node and ensure that the interface between ECC concrete and ordinary concrete is far away from the area with large shear force at the beam end. The self-compacting characteristics of ECC materials also make the construction of this combined node very convenient and the construction quality is guaranteed.

[0022] (3) The oblique connecting plates and annular connecting plates connected inside the cross column of the present invention reliably connect the web of the cross column, which is more in line with the design principle of "strong column and weak beam" than the traditional solution that generally only uses multiple layers of annular connecting plates. In addition, the vertically arranged oblique connecting plates can effectively transfer compressive stress in the core part of the cross column with complex stress, preventing excessive local pressure from having an adverse effect on the stress of ECC concrete.

[0023] (4) In the cross column of the present invention, multiple layers of small-area foot support plates are arranged, which saves materials compared with the traditional support method, is more conducive to the flow of concrete, and is convenient for inserting the vibrator from above during construction.

[0024] In summary, the present invention combines the characteristics of steel sections and ECC concrete, can significantly reduce the number of stirrups and openings while improving structural performance, and is simple to manufacture and convenient to construct. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the reinforced steel column and ECC concrete combined node of the present invention.

[0026] Figure 2 It is a schematic diagram of the upper structure of the cross column of the present invention.

[0027] Figure 3 It is a structural schematic diagram of the annular hoop plate of the present invention.

[0028] Figure 4 It is a schematic diagram of the structure of the reinforced steel column and ECC concrete composite node of the present invention excluding the annular hoop plate.

[0029] Figure 5 yes Figure 4 AA section view of the middle cross column.

[0030] Figure 6 It is a schematic diagram of a steel skeleton node of a reinforced steel column and ECC concrete composite node welded with studs according to the present invention. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See Figure 1-Figure 6 A reinforced steel column and ECC concrete combined node, comprising a cross column 1, four steel beam brackets 2, four vertically arranged annular hoop plates 3, and ECC concrete poured in the end area of ​​the steel column and the steel beam, each cross column comprises a cross column web 11 with a cross structure and four cross column flange plates 12 respectively connected to the corresponding ends of the cross column web 11, the inner end of each steel beam bracket 2 is connected to the corresponding cross column flange plate 12, and each annular hoop plate 3 is connected between two adjacent steel beam brackets 2;

[0033] Each steel beam corbel 2 includes an upper flange plate 21 and a lower flange plate 22 which are arranged horizontally, and a steel beam corbel web plate 23 which is vertically connected between the upper flange plate 21 and the lower flange plate 22. The upper flange plate 21 of each steel beam corbel is located at the same horizontal height. Among the four steel beam corbels, the lower flange plates 22 of two symmetrically arranged steel beam corbels are located at the same horizontal height, and the two lower flange plates 22 which are located at the same horizontal height are lower than the other two lower flange plates 22 which are located at the same horizontal height.

[0034] Each annular hoop plate 3 includes a vertically arranged annular plate 31 and two vertically arranged rectangular plates 32 respectively connected to the two ends of the annular plate 31, and the horizontal heights of the bottom ends of the two rectangular plates 32 are different. The annular plate 31 is provided with strip-shaped through grooves 33 penetrating the two ends of the annular plate at one-third and two-thirds of its height. The rectangular plates 32 at both ends of each annular hoop plate extend between the upper flange plate 21 and the lower flange plate 22 of the corresponding steel beam corbel, and are in close contact with the upper flange plate 21, the lower flange plate 22 and the web plate 23 of the steel beam corbel and are welded and fixed;

[0035] A vertically arranged oblique connecting plate 4 and two upper and lower horizontally arranged annular connecting plates 5 are welded between the adjacent cross column webs 11 of the cross column. A right-angled triangle-shaped foot support plate 6 is connected between the cross column web 11 of the cross column and the corresponding cross column flange plate 12. The vertical height of the oblique connecting plate 4 is selected as the smaller value between half of the height of the steel beam and 400mm. The two annular connecting plates 5 are both located below the oblique connecting plate 4 and the horizontal heights of the two annular connecting plates 5 are respectively the same as the lower flange plates 22 of two different horizontal heights. The two layers of annular connecting plates 5 of different heights on the cross column 1, each layer of annular connecting plates 5 constitutes a The outer circle is an octagonal and the inner circle is a circular annular plate structure, the radius of the inner circle is equal to the difference between the horizontal length extending from the center of the cross column web 11 to the cross column flange plate 12 and the length of the right angle side of the foot support plate 6 close to the cross column web 11, and the cross column 1 is connected with 24 foot support plates 6, and every eight foot support plates 6 are located at the same horizontal height, so as to be divided into three layers of foot support plates 6, the first layer of foot support plates 6 from top to bottom is located above the oblique connection plate 4, the horizontal height of the second layer of foot support plates 6 is equal to the center height between the two lower flange plates 22 at different horizontal heights, and the third layer of foot support plates 6 is located 100mm below the lower flange plate 22 at the lowest horizontal height;

[0036] The pouring cross-sectional range of ECC concrete is the entire distance of the steel column and steel beam extension, and the distance of the steel beam extension is not less than 0.5 times the cross-sectional height of the steel concrete column.

[0037] A construction method for a reinforced steel column and ECC concrete composite node comprises the following steps:

[0038] (1) According to the plane projection size of the cross column 1, draw the center line, outline line and positioning lines of each accessory of the cross column 1 on the ground, and then set up the tire frame template;

[0039] (2) The cross column 1 is hoisted onto the assembly frame for positioning. After the positioning is correct, welding can be carried out. After welding, correction is performed, and then the oblique connecting plate 4, the annular connecting plate 5 and the foot support plate 6 are installed and positioned. When the steel beam bracket 2 and the annular hoop plate 3 are installed and positioned, they are respectively positioned on their respective installation position lines, while ensuring the verticality with the ground;

[0040] (3) After positioning, each component shall be self-checked and mutually checked. After passing the inspection, welding can be carried out. After welding, flaw detection and correction shall be carried out. Then, the tire frame shall be assembled as a whole for acceptance of post-weld integrity.

[0041] (4) Lift the node steel frame on site, weld and install the steel beam, tie the steel bars and support the formwork in the same way as ordinary steel concrete. Tie the wire mesh with steel wire at the junction of ECC concrete and ordinary concrete, then pour the ECC concrete first, and then pour the ordinary concrete.

[0042] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A reinforced steel column and ECC concrete composite node, characterized in that: It includes a cross column, four steel beam brackets, four vertically arranged annular hoop plates and ECC concrete poured in the end area of ​​the steel column and the steel beam. Each cross column includes a cross column web with a cross structure and four cross column flange plates respectively connected to the corresponding ends of the cross column web. The inner end of each steel beam bracket is connected to the corresponding cross column flange plate. Each annular hoop plate is connected between two adjacent steel beam brackets. Each annular hoop plate is provided with a strip through groove. Each of the steel beam corbels comprises an upper flange plate and a lower flange plate which are arranged horizontally, and a steel beam corbel web plate which is vertically connected between the upper flange plate and the lower flange plate. The upper flange plates of each of the steel beam corbels are located at the same horizontal height. Among the four steel beam corbels, the lower flange plates of two symmetrically arranged steel beam corbels are located at the same horizontal height, and the two lower flange plates which are located at the same horizontal height are lower than the other two lower flange plates which are located at the same horizontal height. Each of the annular hoop plates comprises an annular plate arranged vertically and two rectangular plates arranged vertically and connected to the two ends of the annular plate respectively. The strip-shaped through grooves are arranged at one-third and two-thirds of the height of the annular plate and pass through the two ends of the annular plate. The rectangular plates at the two ends of each annular hoop plate extend between the upper flange plate and the lower flange plate of the corresponding steel beam corbel, and are in close contact with the upper flange plate, the lower flange plate and the web plate of the steel beam corbel of the corresponding steel beam corbel and are welded and fixed; A vertically arranged oblique connecting plate and two upper and lower horizontally arranged annular connecting plates are welded between the webs of adjacent cross columns. The vertical height of the oblique connecting plate is selected as the smaller value between half of the height of the steel beam and 400mm. The two annular connecting plates are both located below the oblique connecting plate and the horizontal heights of the two annular connecting plates are the same as those of the lower flange plates of two different horizontal heights.

2. The reinforced steel column and ECC concrete composite node according to claim 1, characterized in that: A right-angled triangle-structured foot support plate is connected between the cross column web plate and the corresponding cross column flange plate of the cross column. Twenty-four foot support plates are connected to the cross column. Every eight foot support plates are located at the same horizontal height, thus divided into three layers of foot support plates. The first layer of foot support plates from top to bottom is located above the oblique connecting plate, the horizontal height of the second layer of foot support plates is equal to the center height between the flange plates at two different horizontal heights, and the third layer of foot support plates is located 100 mm below the flange plate at the lowest horizontal height.

3. A reinforced steel column and ECC concrete composite node according to claim 2, characterized in that: The two layers of annular connecting plates of different heights on the cross column, each layer of annular connecting plates constitutes an annular plate structure with an octagonal outer circle and a circular inner circle, and the radius of the inner circle is equal to the difference between the horizontal length extending from the center of the cross column web to the cross column flange plate and the length of the right angle side of the foot support plate close to the cross column web.

4. The reinforced steel column and ECC concrete composite node according to claim 1, characterized in that: The pouring cross-sectional range of the ECC concrete is a distance extending from the entire steel column and the steel beam, and the distance extending from the steel beam is not less than 0.5 times the height of the cross-sectional area of ​​the steel concrete column.

5. The construction site of a reinforced steel column and ECC concrete composite node according to claim 1, characterized in that: The specific steps include: (1) According to the plane projection size of the cross column, draw the center line, outline line and positioning lines of each accessory on the ground, and then set up the tire frame template; (2) Lift the cross column onto the assembly frame for positioning. After the positioning is correct, welding can be carried out. After welding, correction is made, and then the oblique connecting plate, annular connecting plate and foot support plate are installed and positioned; (3) After positioning, each component shall be self-checked and mutually checked. After passing the inspection, welding can be carried out. After welding, flaw detection and correction shall be carried out. Then, the tire frame shall be assembled as a whole for acceptance of post-weld integrity. (4) On-site hoisting of node steel frames, welding and installation of steel beams, tying of steel bars and support of formwork are carried out in the same manner as for ordinary steel concrete. At the junction of ECC concrete and ordinary concrete, steel mesh is tied with steel wire, and then ECC concrete is poured first, followed by ordinary concrete.

6. The construction site of a reinforced steel column and ECC concrete composite node according to claim 5, characterized in that: The steel beam corbel and the annular hoop plate are positioned at their respective installation position lines during installation and verticality to the ground is ensured.

Images