A reinforcement structure for end plate connection joints and its construction method

Abstract

The present invention discloses an end plate connection node reinforcement structure and a construction method thereof, comprising two reinforcement units; the two reinforcement units are symmetrically arranged on both sides of an existing end plate connection node; each reinforcement unit comprises an H-shaped steel member, two stiffening ribs and two connecting gussets; the H-shaped steel member is fixedly arranged on the side of an existing structural column, and the top end of the H-shaped steel member is tightly arranged against the bottom of an existing structural beam; the stiffening ribs are symmetrically arranged on both sides of the existing structural beam, the upper end of the connecting gusset is fixedly connected to the stiffening ribs, and the lower end is fixedly connected to the H-shaped steel member; by arranging the H-shaped steel member, the rotational stiffness of the existing connection node is effectively improved, and the vertical force transmission between the existing structural beams is ensured; by arranging the stiffening ribs, the local stability of the web when the existing structural beam transmits vertical concentrated loads is ensured, and the H-shaped steel member is connected to the stiffening ribs by connecting the gussets, which effectively improves the shear and bending bearing capacity of the existing end plate connection node.

Description

Technical Field

[0001] The present invention belongs to the technical field of strengthening of beam-column joints with end-plate connections in existing steel structures, and particularly relates to a strengthening structure for end-plate connection joints and a construction method thereof. Background Technique

[0002] In recent years, the scale and quantity of steel structures have been increasing year by year. Connection joints play a very important role in steel structures, and their characteristics are crucial for the integrity, load transfer, and seismic energy dissipation of the structure. Compared with traditional steel structure connection joints, end-plate joints that use friction-type high-strength bolts and connecting plates to connect beams and columns or splice beams together have the advantages of simple structure, convenient construction, high load-bearing performance, and strong energy dissipation performance. Therefore, end-plate connections have become the most widely used joint forms in portal frames and multi-story steel frames. During the construction process, due to factors such as improper construction and the action of the corrosion environment during service, the load-bearing performance of end-plate connection joints in existing steel structures does not meet the usage requirements or the appraisal evaluation standards, posing a serious threat to the safety of the overall structure. To solve the actual problems existing in the use of connection joints, it is necessary to strengthen their joints to improve the stiffness and bearing capacity of the joints and enhance the integrity, seismic performance, and reliability of the structure.

[0003] As shown in the Figure 1-2 accompanying figure, the existing strengthening methods for end-plate connection joints mainly adopt side fillet weld strengthening and full-around weld strengthening. By welding the end-plate and the flange of the original structural member, a connection joint is formed that uses both friction-type high-strength bolt connection and fillet weld connection at the same joint. However, there are many problems with the above methods. Among them, due to the large difference in stiffness between the two connection forms, the load transfer and distribution rules are complex. In addition, when strengthening the joint by using bolt-weld connection, the code clearly requires that the construction sequence should be to tighten the high-strength bolts first and then perform welding.

[0004] However, the friction-type high-strength bolts of end-plate connection joints in existing steel structures are affected by many factors, and the pre-tightening force often has a large loss. The change in the pre-tightening force causes uneven stress on the joint, resulting in phenomena such as relaxation, fracture, and detachment of the high-strength bolts of the connection joint. Although the above problems can be solved by replacing the high-strength bolts to achieve secondary tightening between the flange of the member and the end-plate, and then welding the end-plate by using fillet welds, replacing the high-strength bolts requires supporting and unloading the original structural connection joint. Since there are mostly equipment under the structural beam and the connection joint position is generally high, it not only affects normal production and life, but also has problems such as large construction difficulty and poor economy.

[0005] Meanwhile, existing strengthening methods have certain limitations in engineering applications. In view of problems such as large installation errors during construction, resulting in misalignment between connecting plate members, bolt hole misalignment, bolt missing, and electric welding hole enlargement, etc., this type of joint can no longer achieve secondary fastening between the connecting plate members of the original structure joint by replacing high-strength bolts; especially for joints with too large connecting plate gaps caused by improper construction, or joints with too large gaps caused by relative deformation between connecting plate members due to the failure of high-strength bolt fastening during use, not only can the fastening of high-strength bolts not be achieved for this type of joint, but also the welding between connecting plate members is very difficult to achieve.

[0006] In summary, for the end plate connection joints in existing steel structures, it is urgent to propose a strengthening method with clear force transmission, convenient construction, wide applicability, economy and high efficiency to effectively solve the above defects existing in existing strengthening methods. Summary of the Invention

[0007] In view of the technical problems existing in the prior art, the present invention provides a reinforcement structure for an end plate connection joint and its construction method to solve the technical problems that the existing reinforcement structure for steel structure end plate connection joints has complex load transfer and distribution laws and large construction difficulties.

[0008] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0009] The present invention provides a reinforcement structure for an end plate connection joint, including two reinforcement units; the two reinforcement units are symmetrically arranged on both sides of the existing end plate connection joint; the existing end plate connection joint includes an existing structural column and an existing structural beam, and the existing structural beam is horizontally arranged at the top of the existing structural column;

[0010] Wherein, each reinforcement unit includes an H-shaped steel member, two stiffening rib plates and two connecting batten plates; the H-shaped steel member is fixedly arranged on the side of the existing structural column, and the top of the H-shaped steel member is tightly abutted against the bottom of the existing structural beam; the two stiffening rib plates are symmetrically arranged on both sides of the existing structural beam and are located above the H-shaped steel member; the two connecting batten plates are symmetrically arranged on both sides of the H-shaped steel member, the upper end of the connecting batten plate is fixedly connected to the stiffening rib plate, and the lower end is fixedly connected to the H-shaped steel member.

[0011] Further, the existing structural column is an H-shaped steel column, and the existing structural beam is an H-shaped steel beam; the web of the H-shaped steel member is perpendicular to the web of the existing structural beam, the two flanges of the H-shaped steel member are respectively welded and fixed to the flanges of the existing structural column, and the top of the H-shaped steel member is tightly abutted against the bottom of the lower flange of the existing structural beam.

[0012] Further, two stiffening rib plates are symmetrically arranged on both sides of the web of the existing structural beam. The upper ends of the stiffening rib plates are welded and fixed to the upper flange of the existing structural beam, the lower ends are welded and fixed to the lower flange of the existing structural beam, one side edge of the stiffening rib plates is perpendicularly welded and fixed to the web of the existing structural beam, and the other side edge of the stiffening rib plates is connected to the connecting lacing plate.

[0013] Further, the edges of the stiffening rib plates extend beyond the flanges of the existing structural beam, and the extending width is 60 - 100 mm.

[0014] Further, chamfers are provided on one side of the stiffening rib plates close to the web of the existing structural beam, and welding holes are reserved.

[0015] Further, a rib plate slot is provided in the middle of the upper end of the connecting lacing plate, and the other side edge of the stiffening rib plate is fixedly clamped in the rib plate slot; the two sides of the lower end of the connecting lacing plate are respectively welded and fixed to the flanges of the H-shaped steel member.

[0016] Further, both sides of the stiffening rib plates are respectively welded and fixed to the rib plate slots of the connecting lacing plate.

[0017] Further, the stiffening rib plates and the web of the H-shaped steel member are located in the same vertical plane.

[0018] Further, anti-corrosion / fire-proof coatings are provided on the surfaces of the existing end plate connection node, the H-shaped steel member, the stiffening rib plates and the connecting lacing plate.

[0019] The present invention also provides a construction method for the reinforcement structure of the end plate connection node, including the following steps:

[0020] The H-shaped steel member is arranged on both sides of the fixed existing structural column, and the top end of the H-shaped steel member is tightly abutted against the bottom of the existing structural beam;

[0021] Stiffening rib plates are respectively arranged on both sides of the existing structural beam;

[0022] The H-shaped steel member and the stiffening rib plates are fixedly connected together by using the connecting lacing plate.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] The present invention provides a reinforcement structure for an end - plate connection node and its construction method. By arranging an H - shaped steel member between an existing structural column and an existing structural beam, the rotational stiffness of the existing connection node is effectively improved, ensuring the vertical force transfer between the existing structural beams; by arranging stiffening rib plates on both sides of the existing structural beam, the local stability of the web when the existing structural beam transfers vertical concentrated loads is guaranteed, providing a tying condition between the existing structural columns and beams; by connecting the H - shaped steel member and the stiffening rib plates with connecting batten plates, the effective tying between the existing structural columns and beams is ensured, effectively improving the shear and flexural bearing capacities of the existing end - plate connection node; during the reinforcement process, it is not necessary to replace the high - strength bolts between the existing connection nodes, the construction difficulty is small, the load transfer and distribution rules are clear, it is stable and reliable, and the safety is relatively high.

[0025] Furthermore, by extending the edge of the stiffening rib plate outside the flange of the existing structural beam, sufficient tying space is provided for the connecting batten plate; by arranging the stiffening rib plate, it is ensured that the vertical concentrated load of the existing structure can be stably transferred to the H - shaped steel member.

[0026] Furthermore, by arranging a chamfer on the side of the stiffening rib plate close to the web of the existing structural beam and reserving a through - welding hole, the stress concentration caused by intersecting welds is effectively avoided.

[0027] Furthermore, by arranging a rib - plate slot at the upper end of the connecting batten plate and fixedly clamping the stiffening rib plate in the rib - plate slot, the reliable connection between the stiffening rib plate and the connecting batten plate is realized, improving the effectiveness of the tying and fixing of the connecting batten plate.

[0028] Furthermore, the stiffening rib plate is arranged in the same plane as the web of the H - shaped steel member, ensuring the vertical force transfer between the existing structural beams.

[0029] Furthermore, by applying anti - corrosion / fire - proof coatings on the surface of the reinforcement member, the anti - corrosion / fire - proof performance of the reinforcement structure is improved, ensuring the durability of the connection node and components after reinforcement.

[0030] In summary, for the end - plate connection joint reinforcement structure and its construction method of the present invention, the reinforcement structure is simple, the force - transmission path is clear, the construction is convenient, the investment cost is relatively low, and the reliability is good. It can achieve the goals of convenient, economical, and effective reinforcement; it has a wide range of applications and can be applied to end - plate connection joints where high - strength bolts cannot be replaced and re - tightened, as well as end - plate connection beam - column joints where welding cannot be carried out due to excessive clearance between connecting plate members, making up for the limitations of existing reinforcement methods in practical engineering applications; without affecting normal production and life, without occupying extra space, and without changing the functional characteristics of the structure, it can reinforce the beam - column joints of existing steel - structure end - plate connections under the action of structural loads, without unloading the original damaged joints and without other additional treatments; the reinforcement effect is good and the practical value is high, with obvious advantages in economy and practicality, not restricted by site and conditions, and the construction period required is short, the construction space required is small, and it can effectively improve the bearing capacity and seismic performance of beam - column joints of existing steel - structure end - plate connections; it has operability and popularization potential, and can bring significant economic and social benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a side fillet - weld reinforcement structure diagram of an existing end - plate connection joint;

[0032] Figure 2 It is a full - weld reinforcement structure diagram of an existing end - plate connection joint;

[0033] Figure 3 It is a front view of the end - plate connection joint reinforcement structure of the present invention;

[0034] Figure 4 It is an isometric view of the end - plate connection joint reinforcement structure of the present invention;

[0035] Figure 5 It is a cross - sectional view of the end - plate connection joint reinforcement structure of the present invention;

[0036] Figure 6 It is a front view of the connection structure of the H - shaped steel member in the end - plate connection joint reinforcement structure of the present invention;

[0037] Figure 7 It is an isometric view of the connection structure of the H - shaped steel member in the end - plate connection joint reinforcement structure of the present invention;

[0038] Figure 8 It is a cross - sectional view of the connection structure of the H - shaped steel member in the end - plate connection joint reinforcement structure of the present invention;

[0039] Figure 9 It is a front view of the connection structure of the stiffening rib plate in the end - plate connection joint reinforcement structure of the present invention;

[0040] Figure 10 Isometric view of the connection structure of the stiffening rib plate in the end plate connection node reinforcement structure of the present invention;

[0041] Figure 11 Cross-sectional view of the connection structure of the stiffening rib plate in the end plate connection node reinforcement structure of the present invention.

[0042] Among them, 1 is the existing structural column, 2 is the existing structural beam, 3 is the first node connecting plate, 4 is the second node connecting plate, 5 is the high-strength bolt, 6 is the H-shaped steel member, 7 is the stiffening rib plate, and 8 is the connecting batten plate. Specific implementation mode

[0043] In order to make the technical problems, technical solutions and beneficial effects solved by the present invention clearer, the following specific embodiments are used to further elaborate on the present invention. It should be understood that the specific embodiments described here are only used to explain the present invention and are not used to limit the present invention.

[0044] As shown in the appendix Figure 3-11 As shown, the present invention provides an end plate connection node reinforcement structure, which includes two reinforcement units symmetrically arranged on both sides of the existing end plate connection node; the existing end plate connection node includes an existing structural column 1, an existing structural beam 2, a first node connecting plate 3, a second node connecting plate 4 and a number of high-strength bolts 5; the existing structural beam 2 is horizontally arranged at the top of the existing structural column 1, the existing structural column 1 is an H-shaped steel column, and the existing structural beam 2 is an H-shaped steel beam; the first node connecting plate 3 and the second node connecting plate 4 are arranged between the existing structural beam 2 and the existing structural column 1, the first node connecting plate 3 is fixedly connected to the lower flange of the existing structural beam 2, the lower surface of the first node connecting plate 3 is closely attached to the upper surface of the second node connecting plate 4, and the lower surface of the second node connecting plate 4 is welded and fixed to the top of the existing structural column 1; in the node area, a number of bolt holes are evenly arranged on the lower flange of the existing structural beam 2, the first node connecting plate 3 and the second node connecting plate 4, and the high-strength bolts 5 sequentially pass through the bolt holes on the first node connecting plate 3 and the second node connecting plate 4 to fixedly connect the existing structural beam 2, the first node connecting plate 3 and the second node connecting plate 4 together; preferably, the high-strength bolts 5 are friction-type high-strength bolts.

[0045] Each strengthening unit includes an H-shaped steel member 6, two stiffening rib plates 7 and two connecting batten plates 8; the H-shaped steel member 6 is fixedly arranged on the side of the existing structural column 1, and the web of the H-shaped steel member 6 is perpendicular to the web of the existing structural beam 2; the two flanges of the H-shaped steel member 6 are respectively welded and fixed to the flanges of the existing structural column 1, and the top end of the H-shaped steel member 6 is tightly abutted against the bottom of the lower flange of the existing structural beam 1; the two stiffening rib plates 7 are symmetrically arranged on both sides of the existing structural beam 2 and are located above the H-shaped steel member 6; preferably, the stiffening rib plate 7 and the web of the H-shaped steel member 6 are in the same vertical plane; the upper end of the stiffening rib plate 7 is welded and fixed to the upper flange of the existing structural beam 2, the lower end is welded and fixed to the lower flange of the existing structural beam 2, one side edge of the stiffening rib plate 7 is perpendicularly welded and fixed to the web of the existing structural beam 2, and the other side edge of the stiffening rib plate 7 is fixed to the connecting batten plate 8; preferably, the edge of the stiffening rib plate 7 extends out of the flange of the existing structural beam 2, and the extending width is 60-100mm.

[0046] The side of the stiffening rib plate 7 close to the web of the existing structural beam 2 is chamfered and a welding through-hole is reserved, which avoids the stress concentration caused by the intersecting welds and ensures the performance and welding quality of the joint.

[0047] The two connecting batten plates 8 are symmetrically arranged on both sides of the H-shaped steel member 6. The upper end of the connecting batten plate 8 is fixedly connected to the stiffening rib plate 7, and the lower end is fixedly connected to the H-shaped steel member 6; preferably, a rib plate clamping groove is arranged in the middle of the upper end of the connecting batten plate 8, and the extended end of the stiffening rib plate 7 is fixedly clamped in the rib plate clamping groove, and the two side surfaces of the upper end of the stiffening rib plate 7 are respectively welded and fixed to the rib plate clamping grooves of the connecting batten plate 8; the two sides of the lower end of the connecting batten plate 8 are respectively welded and fixed to the flanges of the H-shaped steel member 6.

[0048] Anticorrosion / fireproof coatings are provided on the surfaces of the existing end plate connection node, the H-shaped steel member 6, the stiffening rib plate 7 and the connecting batten plate 8. The anticorrosion / fireproof coatings shall not be lower than the requirements of the design standard, and it is ensured that the interface between the newly applied coating and the old coating on the surface of the existing end plate connection node is well combined.

[0049] The end - plate connection joint reinforcement structure and its construction method of the present invention can supplement and reinforce the existing steel - structure end - plate connection joints. The reinforcement structure of the present invention aims at the end - plate connection beam - column joints where it is impossible to achieve secondary fastening between the joint connection plates by replacing high - strength bolts, especially for the joints with too large gaps between the connection plates caused by improper construction, or for the end - plate connection beam - column joints with too large gaps caused by relative deformation between the connection plates due to the failure of high - strength bolt fastening during use. It provides a reinforcement method that does not affect normal production and life, does not occupy extra space, and does not change the functional characteristics of the structure under the action of load in the existing structure. The present invention realizes the effective transfer of axial force, shear force and bending moment of the joint by adding H - shaped steel members, stiffening rib plates and connecting lacing plates and welding them to the existing structure beam - column, effectively improving the bearing capacity and seismic performance of the existing steel - structure end - plate connection joints.

[0050] The present invention also provides a construction method for the end - plate connection joint reinforcement structure, which includes the following steps:

[0051] Install the H - shaped steel member 6 on both sides of the existing structure column 1 and tightly abut the top of the H - shaped steel member 6 against the bottom of the existing structure beam 2; respectively arrange stiffening rib plates 7 on both sides of the existing structure beam 2; use the connecting lacing plate 8 to fixedly connect the H - shaped steel member 6 and the stiffening rib plate 7 together.

[0052] The specific construction process is as follows:

[0053] Step 1: Use friction - type high - strength bolts 5 to tightly connect the first joint connection plate 3 at the lower flange of the existing structure beam 2 and the second joint connection plate 4 at the top of the existing structure column 1 to form an existing end - plate connection joint; measure the size of the existing end - plate connection joint and lay out the lines. Combine the actual situation of on - site construction to determine the size of the H - shaped steel member 6; use manual or mechanical grinding methods to remove the original anti - corrosion / anti - fire coating at the existing end - plate connection joint, that is, remove the original anti - corrosion / anti - fire coating in the welding part and its surrounding area, so that the metal luster of the steel surface is exposed, providing conditions for the welding of the reinforcement structure and the existing structure members; place the web of the H - shaped steel member 6 perpendicular to the web of the existing structure beam 2, and make the upper end of the H - shaped steel member 6 be planed and tightly abutted against the bottom of the lower flange of the existing structure beam 2, and use fillet welds to weld the flange of the H - shaped steel member 6 and the existing structure column 1; connect the existing structure column 1 and the existing structure beam 2 together through the H - shaped steel member 6 to realize the transfer of vertical load between them.

[0054] Step 2: Stiffening plates 7 are symmetrically arranged on both sides of the web of the existing structural beam 2. The stiffening plates 7 are arranged facing the web of the H-shaped steel member 6 and are perpendicular to the web of the existing structural beam 2. The upper end, lower end and side of the stiffening plate 7 are welded and fixed to the upper flange, lower flange and web of the existing structural beam 2 respectively by fillet welds. The height of the stiffening plate 7 is determined according to the measured height of the web of the existing structural beam 2 at the on-site connection position. The width of the stiffening plate 7 extends to the edges of the upper and lower flanges of the existing structural beam 2. Preferably, the extended width is 60 - 100 mm. In order to avoid stress concentration caused by intersecting welds, the side of the stiffening plate 7 close to the web of the existing structural beam 2 is chamfered and an access hole for welding is left. By setting the stiffening plate, the local bearing problem when the existing structural beam transfers the vertical load to the web of the H-shaped steel member is solved. By extending the stiffening plate to the upper and lower flanges of the existing structural beam, conditions are provided for connecting the existing structural beam and the H-shaped steel member through connecting batten plates.

[0055] Step 3: Grooves are cut at the upper end of the connecting batten plate according to the height and thickness of the stiffening plate. During on-site construction, they are vertically and cross-installed and temporarily fixed. The stiffening plate and the connecting batten plate are welded and fixed together by fillet welds, and both ends of the connecting batten plate are welded and fixed to the flanges of the H-shaped steel member by fillet welds.

[0056] Step 4: External pipe quality inspection and internal flaw detection are carried out on all the fillet welds above. After meeting the requirements of the corresponding specifications and technical standards, anti-corrosion / fireproof coating is applied to the surfaces of the existing end plate connection nodes, H-shaped steel members 6, stiffening plates 7 and connecting batten plates 8. The coating requirements shall not be lower than the original design standard, and reliable technical measures shall be taken to ensure good bonding at the interface between the new and old coatings. After completion, it can be put into use.

[0057] The end plate connection joint reinforcement structure of the present invention adds H-shaped steel members, stiffening rib plates and connecting batten plates at the existing end plate connection joint, detects the welding quality after construction is completed, and sets anti-corrosion / fire-proof coating; among them, H-shaped steel members 6 are added on both sides of the top of the existing structural column, the web of the H-shaped steel member 6 is perpendicular to the web of the existing structural beam 2, and is flush with the lower flange of the existing structural beam 2; the two flanges of the H-shaped steel member 6 are fixed by fillet welding with the flanges of the existing structural column 1; stiffening rib plates 7 are added on both sides of the web of the existing structural beam 2, the stiffening rib plates 7 are located above the H-shaped steel member 6 and are arranged opposite to the web of the H-shaped steel member 6; the stiffening rib plates 7 are fixed by fillet welding with the upper flange, lower flange and web of the existing structural beam 2; a rib plate slot is provided at the center of the upper end of the connecting batten plate 8, and the connecting batten plate 8 is vertically inserted on the stiffening rib plate 7 through the rib plate slot; the connecting batten plate 8 is fixed by fillet welding with the stiffening rib plate 7 and the flanges of the H-shaped steel member 6; after ensuring that the welding quality meets the requirements of corresponding specifications and technical standards, anti-corrosion and fire-proof coatings are applied, and it can be put into use after completion.

[0058] In the existing end plate connection joint, the high-strength bolts on both sides of the joint connecting plate bear the bending moment, and the high-strength bolts near the center of the joint connecting plate mainly bear the shear force; when there is a bending moment, in the existing end plate connection joint, taking the center distance between the first row of high-strength bolts on both sides as the moment arm and the center of the joint connecting plate as the neutral axis, the bending moment of the existing end plate connection joint is converted into a pair of force couples of the first and second rows of high-strength bolts on both sides of the existing structural column in the plane; in the present invention, by setting the connecting batten plate, stiffening rib plate and H-shaped steel member, the existing structural beam and the existing structural column are effectively tied together outside the existing end plate connection joint; by setting the connecting batten plate, the lateral shear area of the connecting batten plate is used to replace the high-strength bolts in the existing end plate connection joint to bear the shear force of the entire joint; according to the reinforcement structure described in the present invention, after the existing end plate connection joint is reinforced, since in the plane of the steel structure, the center distance of the connecting batten plates arranged on the same side is greater than the center distance between the first row of high-strength bolts on both sides of the existing end plate connection joint, therefore, the connecting batten plates of the reinforced joint give priority to bearing the bending moment and directly distribute and transfer the joint bending moment to the existing structural beam and column members, not only replacing the bending moment transfer at the existing joint connection; at the same time, the rotational stiffness of the existing end plate connection joint is increased.

[0059] The above embodiments are only one of the implementation manners capable of realizing the technical solution of the present invention. The scope of protection required by the present invention is not only limited by this embodiment, but also includes any changes, substitutions and other implementation manners that are easily conceivable by those skilled in the art within the technical scope disclosed by the present invention.

Claims

1. A reinforcing structure for an end - plate connection joint, characterized in that, it includes two reinforcing units; the two reinforcing units are symmetrically arranged on both sides of the existing end - plate connection joint; the existing end - plate connection joint includes an existing structural column (1) and an existing structural beam (2), and the existing structural beam (2) is horizontally arranged at the top of the existing structural column (1); wherein, each reinforcing unit includes an H - shaped steel member (6), two stiffening rib plates (7) and two connecting batten plates (8); the H - shaped steel member (6) is fixedly arranged on the side of the existing structural column (1), and the top of the H - shaped steel member (6) is tightly abutted against the bottom of the existing structural beam (2); the two stiffening rib plates (7) are symmetrically arranged on both sides of the existing structural beam (2) and are located above the H - shaped steel member (6); the two connecting batten plates (8) are symmetrically arranged on both sides of the H - shaped steel member (6), the upper end of the connecting batten plate (8) is fixedly connected to the stiffening rib plate (7), and the lower end is fixedly connected to the H - shaped steel member (6); the existing structural column (1) is an H - shaped steel column, and the existing structural beam (2) is an H - shaped steel beam; the web of the H - shaped steel member (6) is perpendicular to the web of the existing structural beam (2), the two flanges of the H - shaped steel member (6) are respectively welded and fixed to the flanges of the existing structural column (1), and the top of the H - shaped steel member (6) is tightly abutted against the bottom of the lower flange of the existing structural beam (2); the stiffening rib plate (7) and the web of the H - shaped steel member (6) are in the same vertical plane.

2. A reinforcing structure for an end - plate connection joint according to claim 1, characterized in that, the two stiffening rib plates (7) are symmetrically arranged on both sides of the web of the existing structural beam (2), the upper end of the stiffening rib plate (7) is welded and fixed to the upper flange of the existing structural beam (2), the lower end is welded and fixed to the lower flange of the existing structural beam (2), one side edge of the stiffening rib plate (7) is perpendicularly welded and fixed to the web of the existing structural beam (2), and the other side edge of the stiffening rib plate (7) is connected to the connecting batten plate (8).

3. A reinforcing structure for an end - plate connection joint according to claim 2, characterized in that, the edge of the stiffening rib plate (7) extends beyond the flange of the existing structural beam (2), and the extending width is 60 - 100 mm.

4. A reinforcing structure for an end - plate connection joint according to claim 2, characterized in that, a chamfer is provided on one side of the stiffening rib plate (7) close to the web of the existing structural beam (2), and a welding through - hole is reserved.

5. A reinforcing structure for an end - plate connection joint according to claim 2, characterized in that, a rib - plate slot is provided in the middle of the upper end of the connecting batten plate (8), and the other side edge of the stiffening rib plate (7) is fixedly clamped in the rib - plate slot; the two sides of the lower end of the connecting batten plate (8) are respectively welded and fixed to the flanges of the H - shaped steel member (6).

6. A reinforcing structure for an end - plate connection joint according to claim 5, characterized in that, the two side surfaces of the stiffening rib plate (7) are respectively welded and fixed to the rib - plate slots of the connecting batten plate (8).

7. A reinforcing structure for an end - plate connection joint according to claim 1, characterized in that, anti - corrosion / fire - proof coatings are provided on the surfaces of the existing end - plate connection joint, the H - shaped steel member (6), the stiffening rib plate (7) and the connecting batten plate (8).

8. Construction method of a reinforcement structure for an end plate connection node as described in any one of claims 1 - 7, characterized in that, it comprises the following steps: Arrange H - shaped steel members (6) on both sides of the existing structural column (1) fixedly, and tightly abut the top of the H - shaped steel members (6) against the bottom of the existing structural beam (2); Arrange stiffening rib plates (7) on both sides of the existing structural beam (2) respectively; Use connecting batten plates (8) to fixedly connect the H - shaped steel members (6) and the stiffening rib plates (7) together.

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