Weldless monitorable steel joint low fatigue stress connecting structure

Abstract

The application relates to the technical field of wind power equipment, in particular to a welding-free and monitorable steel node low-fatigue stress connecting structure, which comprises a stiffened rib plate, an intermediate plate, a steel-concrete integrated assembly, a connecting assembly and a detecting assembly; the steel-concrete integrated assembly comprises a combined plate and ECC, the combined plate is provided with a groove for filling the ECC; the stiffened rib plate is oppositely arranged with the intermediate plate, the combined plate is fixed on the two sides of the stiffened rib plate and the intermediate plate, and the ECC is located between the combined plate and the stiffened rib plate or between the combined plate and the intermediate plate; the connecting assembly is connected between the combined plate and the stiffened rib plate and between the combined plate and the intermediate plate, and the detecting assembly is connected to the connecting assembly. The application solves the technical problem that the steel truss tower node appears fatigue failure under the action of fan vibration and wind load when the steel truss tower with a higher height is put into operation.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of wind power equipment, in particular to a welding-free and monitorable steel node low fatigue stress connection structure. BACKGROUND

[0002] The development of wind power in the early and middle stages mainly focuses on the medium and high wind speed areas, while in the low wind speed areas, due to the height limitation of the steel wind tower, the wind resource development effect is not ideal, and then a steel truss tower with higher height is used to develop the wind resources in the low wind speed areas.

[0003] When the steel truss tower with higher height is put into operation, the rotation of the wind turbine blades in the upper area of the tower and the action of the wind load on the tower itself will cause the fatigue failure of the steel truss tower node. The fatigue failure of the node will lead to the fracture of the steel plate or bolt, and even cause the instability and collapse of the whole structure, which seriously endangers the safety of personnel and causes serious economic damage. SUMMARY

[0004] The present application aims to provide a welding-free and monitorable steel node low fatigue stress connection structure to solve the technical problem that the steel truss tower with higher height will cause the fatigue failure of the steel truss tower node under the action of the wind turbine vibration and wind load when put into operation in the prior art, and the specific technical solution is as follows:

[0005] The present application provides a welding-free and monitorable steel node low fatigue stress connection structure, which comprises a stiffened rib plate, an intermediate plate, a steel-concrete integrated assembly, a connecting assembly and a detection assembly. The steel-concrete integrated assembly comprises a combined plate and an ECC, the combined plate is provided with a groove for filling the ECC; the stiffened rib plate is arranged opposite to the intermediate plate, the combined plate is clamped and fixed on both sides of the stiffened rib plate and the intermediate plate, and the ECC is located in the groove formed by the stiffened rib plate and the intermediate plate and the combined plate; the connecting assembly is connected between the combined plate and the stiffened rib plate and between the combined plate and the intermediate plate, and the detection assembly is connected to the connecting assembly.

[0006] Further improvement of the welding-free and monitorable steel node low fatigue stress connection structure is that the steel-concrete integrated assembly is in the shape of a waist circle, the combined plate comprises two waist circle flat plates and two bent strip plates, one bent strip plate is fixed with the intermediate plate and the two waist circle flat plates, and the other bent strip plate is fixed with the stiffened rib plate and the two waist circle flat plates; each bent strip plate is divided into two butt plates from the middle, and the intermediate plate or the stiffened rib plate is fixed between the two divided butt plates, and the butt plates, the waist circle flat plates and the intermediate plate or the stiffened rib plate form a groove for filling the ECC.

[0007] Further improvement of the welding-free and monitorable steel node low fatigue stress connecting structure of the present application is that a plurality of semispherical grooves are arranged on the connecting side of the butt plate and the intermediate plate or the stiffening rib plate, and the semispherical grooves are used to fill the structural adhesive connected with the intermediate plate or the stiffening rib plate.

[0008] Further improvement of the welding-free and monitorable steel node low fatigue stress connecting structure of the present application is that the bent strip plate comprises a lateral straight section, a bottom section and a semicircular section connected in sequence, the bottom section is perpendicular to the lateral straight section, and an opening for filling the ECC is formed between the lateral straight section and the semicircular section.

[0009] Further improvement of the welding-free and monitorable steel node low fatigue stress connecting structure of the present application is that the connecting assembly comprises a first bolt and a second bolt, the diameter of the first bolt is larger than that of the second bolt, the first bolt comprises a first screw rod, a first rubber ring and a first nut, the first screw rod is arranged between the combined plate and the stiffening rib plate and between the combined plate and the intermediate plate, the first rubber ring is sleeved on the first screw rod and located at the position of the groove, and the first nut is screwed on the end of the first screw rod.

[0010] Further improvement of the welding-free and monitorable steel node low fatigue stress connecting structure of the present application is that the number of the first bolts and the number of the second bolts are both multiple, the multiple second bolts are arranged close to the lateral straight section and along the length direction of the lateral straight section, and the multiple first bolts are arranged close to the bottom section, the semicircular section and the opening side of the groove and in a U-shaped manner.

[0011] Further improvement of the welding-free and monitorable steel node low fatigue stress connecting structure of the present application is that the detection assembly comprises a strain gauge, a strain conditioner and a strain acquisition instrument, the strain gauge is pasted between the first screw rod and the first rubber ring through an adhesive, the strain gauge is connected to the strain conditioner through a wire, and the strain conditioner is connected to the strain acquisition instrument.

[0012] Further improvement of the welding-free and monitorable steel node low fatigue stress connecting structure of the present application is that the strain of the first screw rod The expression of the strain of the first screw rod is as follows:

[0013] ;

[0014] Wherein, t is the total thickness of the strain gauge substrate and the adhesive layer, R is the radius of the first screw rod.

[0015] Further improvement of the welding-free and monitorable steel node low fatigue stress connecting structure of the present application is that the inner wall of the combined plate is a frosted surface.

[0016] The further improvement of the welding-free and monitorable steel node low fatigue stress connecting structure of the application is that the end face filled with the ECC and the end face of the combined plate are flush, and the end face filled with the ECC and the end face of the combined plate are coated with a waterproof layer.

[0017] The technical scheme of the application has the following beneficial effects:

[0018] The welding-free and monitorable steel node low fatigue stress connecting structure of the application can effectively reduce the stress concentration of the connecting components in the region through the combined structure of the combined plate and the ECC, and the ECC can not only uniformly disperse the stress of the connecting components, but also increase the stiffness of the joint surface to prevent the bending of the steel plate, so that the economic benefits are higher than those of the equal-thickness steel plate.

[0019] The welding-free and monitorable steel node low fatigue stress connecting structure of the application is a node form capable of reducing the fatigue stress amplitude of the steel tower node, and the semicircular regions at both ends of the waist round plate can effectively reduce the stress concentration of the bolts in the region, the number of bolts is increased at the junction of the stiffened rib plate and the intermediate plate to reduce the damage hazard of the node when the fatigue damage of the bolts in a certain place occurs, the combined connection form of the bolt-rubber ring can effectively reduce the fatigue stress amplitude of the combined component, the ECC can not only uniformly disperse the stress borne by each bolt, but also increase the stiffness of the joint surface to prevent the bending of the steel plate, so that the economic benefits are higher than those of the equal-thickness steel plate, the frosted surface of the combined plate can also increase the adhesion between the ECC and the combined plate, the double-nut combined component at the end of the screw rod can effectively prevent the loosening of the nut and greatly increase the friction between the threads that need to be overcome during the rotation of the nut to reduce the premature fatigue of the bolt, the half-hemispherical groove in the thickness surface of the bent strip-shaped plate can enhance the connection performance of the stiffened rib plate and the intermediate plate with the waist round plate with a screw hole, and the welding-free treatment can also avoid the welding fatigue at the interface.

[0020] In addition to the purposes, features and advantages described above, the application has other purposes, features and advantages. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings, which form a part of this application, are included to provide a further understanding of the application, illustrate the preferred embodiments of the application and assist in

[0022] Figure 1 is a plan view of the low fatigue stress connection structure of the weld-free monitorable steel joint of the present application;

[0023] Figure 2 is Figure 1 is a cross-sectional view along A-A;

[0024] Figure 3 is Figure 1 is a cross-sectional view along B-B;

[0025] Figure 4 is Figure 1 is a cross-sectional view along C-C;

[0026] Figure 5 is a bent strip-shaped plate plan view of the low fatigue stress connection structure of the weld-free monitorable steel joint of the present application;

[0027] Figure 6 is a detection assembly connection schematic view of the low fatigue stress connection structure of the weld-free monitorable steel joint of the present application.

[0028] wherein 1, stiffened rib plate; 2, intermediate plate; 3, steel-concrete integrated assembly; 4, connection assembly; 5, combined plate; 6, ECC; 7, structural adhesive; 8, detection assembly; 9, frosted surface; 10, waterproof layer;

[0029] 41, first bolt; 42, second bolt;

[0030] 411, first screw rod; 412, first rubber ring; 413, first nut; 414, first anti-loosening washer; 415, first bolt hole;

[0031] 421, second screw rod; 422, second rubber ring; 423, second nut; 424, second anti-loosening washer; 425, second bolt hole;

[0032] 51, waist round flat plate; 52, bent strip-shaped plate;

[0033] 521, semicircular segment; 522, lateral straight segment; 523, bottom segment; 524, semispherical groove;

[0034] 81, strain gauge; 82, wire; 83, strain conditioner; 84, interface; 85, interface partition. DETAILED DESCRIPTION

[0035] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0036] Referring to Figures 1-6 As shown in the drawings, a weld-free monitorable steel node low fatigue stress connecting structure includes a stiffened rib plate 1, an intermediate plate 2, a steel-concrete integrated assembly 3, a connecting assembly 4 and a detection assembly 8; the steel-concrete integrated assembly 3 includes a combined plate 5 and an ECC 6, the combined plate 5 is provided with a groove for filling the ECC 6; the stiffened rib plate 1 is arranged opposite to the intermediate plate 2, the combined plate 5 is clamped and fixed on both sides of the stiffened rib plate 1 and the intermediate plate 2, and the ECC 6 is located in the groove formed by the stiffened rib plate 1, the intermediate plate 2 and the combined plate; the connecting assembly 4 is connected between the combined plate 5 and the stiffened rib plate 1 and between the combined plate 5 and the intermediate plate 2, and the detection assembly 8 is connected to the connecting assembly 4.

[0037] In this embodiment, the combined plate 5, the stiffened rib plate 1 and the intermediate plate 2 are all made of steel. During installation, the stiffened rib plate 1, the intermediate plate 2, the connecting assembly 4 and the detection assembly 8 are first connected, and then the ECC (ultra-high performance engineering cement-based composite material) is poured. During pouring, the combined plate can be turned over so that the opening of the groove faces upward, and then the ECC 6 is uniformly poured into the groove and vibrated.

[0038] Preferably, as shown in Figure 1 and Figure 2 The steel-concrete integrated assembly 3 is in the shape of a waist circle, the combined plate 5 includes two waist circle flat plates 51 and two bent strip plates 52, one bent strip plate 52 is fixed with the intermediate plate 2 and the two waist circle flat plates 51, and the other bent strip plate 52 is fixed with the stiffened rib plate 1 and the two waist circle flat plates 51; each bent strip plate 52 is divided into two butt plates from the middle, and the intermediate plate 2 or the stiffened rib plate 1 is fixedly connected between the two divided butt plates, and the butt plates, the waist circle flat plates 51 and the intermediate plate 2 or the stiffened rib plate 1 form a groove for filling the ECC 6. Specifically, each bent strip plate 52 is divided into two upper and lower butt plates from the middle, so that the intermediate plate 2 or the stiffened rib plate 1 can pass through between the two butt plates. The two ends of the waist circle flat plate 51 are in the shape of a semicircle, which can effectively reduce the stress concentration of the bolts in this area. The holes are positioned according to the design of the bolts, and the inner surface is frosted 9 to increase the bonding force of the ECC and the steel plate, and is connected with the bent strip plate 52.

[0039] Preferably, as shown in Figure 5As shown, the docking plate is spaced apart from the connecting side of the intermediate plate 2 or the stiffening rib plate by a plurality of hemispherical grooves 524 for filling the structural adhesive 7 connected with the intermediate plate 2 or the stiffening rib plate. Before the docking plate is connected with the stiffening rib plate 1 and the intermediate plate 2, the hemispherical grooves 524 are uniformly filled with the structural adhesive 7, then the docking plate is connected and compressed with the stiffening rib plate 1 and the intermediate plate 2, and finally the structural adhesive 7 is applied on the edge of the contact surface. The hemispherical grooves 524 can enhance the connection performance of the stiffening rib plate 1 and the intermediate plate 2 with the docking plate, and the welding-free treatment can avoid the interface welding fatigue.

[0040] Preferably, the bent strip plate 52 comprises a lateral straight section 522, a bottom section 523 and a semicircular section 521 connected in sequence, the bottom section 523 is perpendicular to the lateral straight section 522, and the lateral straight section 522 and the semicircular section 521 form an opening for filling the ECC 6. The shape of the bent strip plate 52 is bent according to the outer contour of the waist-shaped flat plate 51, the inner surface is also provided with the frosted surface 9, and the thickness surface of the bent strip plate 52 is connected with the waist-shaped flat plate 51.

[0041] Preferably, as shown in FIG. 6, the waist-shaped flat plate 51 is provided with a plurality of bent strip plates 52, and the bent strip plates 52 are arranged in the same direction and are connected with the waist-shaped flat plate 51. Figure 2As shown, the connecting assembly 4 includes a first bolt 41 and a second bolt 42, the diameter of the first bolt 41 is larger than that of the second bolt 42, the first bolt 41 includes a first screw rod 411, a first rubber ring 412 and a first nut 413, the first screw rod 411 is arranged between the combined plate 5 and the stiffened rib plate 1 and between the combined plate 5 and the intermediate plate 2, the first rubber ring 412 is sleeved on the first screw rod 411 and located at the position of the groove, and the first nut 413 is screwed on the end of the first screw rod 411. The stiffened rib plate 1 and the intermediate plate 2 are both holed according to the design positioning of the first bolt 41 and the second bolt 42. Further, the connecting assembly 4 further includes a first lock washer 414, the number of the first lock washer 414 and the first nut 413 is both two, the first nut 413 and the first lock washer 414 are placed in the first screw rod 411 opposite to the other end of the nut, are placed in sequence according to the order of the first lock washer 414, the first nut 413, the first lock washer 414 and the first nut 413, and are tightened according to the design torque. The double-nut assembly at the end of the first screw rod 411 can effectively prevent the nut from loosening, greatly improve the thread friction that needs to be overcome by the rotation of the nut, and avoid the premature fatigue of the bolt. The number of the first rubber ring 412 is two, which are respectively located at the groove positions on both sides of the intermediate plate 2 or the stiffened rib plate 1, and the first rubber ring 412 is sleeved on the first screw rod 411 and closely adheres to the first screw rod 411, the first rubber ring 412 is customized according to the groove depth and width of the combined plate 5, and the combined connection form of the first bolt 41 and the first rubber ring 412 can effectively reduce the fatigue stress amplitude of the combined assembly. The structure of the second bolt 42 is the same as that of the first bolt 41, only the installation position and the diameter are different, and the diameter of the second bolt 42 is 0.6 times that of the first bolt 41. The waist round flat plate 51, the stiffened rib plate 1 and the intermediate plate 2 are all holed to arrange the first screw rod 411 and the second screw rod 421, the second bolt 42 includes a second screw rod 421, a second rubber ring 422, a second nut 423 and a second lock washer 424.

[0042] Preferably, as Figure 1As shown, the number of the first bolts 41 and the number of the second bolts 42 are both multiple, the multiple second bolts 42 are close to the lateral straight section 522 and are arranged along the length direction of the lateral straight section 522, the multiple first bolts 41 are close to the bottom section 523, the semicircular section 521 and the opening side of the groove and are arranged in a U shape. In this embodiment, there are ten first bolts 41 arranged along the two ends of the combined plate 5 and passing through the combined plate 5, the stiffened rib plate 1 or the intermediate plate 2 in sequence. There are ten second bolts 42 arranged at the junction of the stiffened rib plate 1 and the intermediate plate 2, five at each end. The number of the second bolts 42 is increased at the junction of the stiffened rib plate 1 and the intermediate plate 2 to reduce the damage hazard of the node when the fatigue failure of the second bolts 42 occurs at a certain place.

[0043] The first nut 413 and the first lock washer 414 are customized according to the outer diameter of the first screw rod 411 and are placed in the first screw rod 411 opposite to the other end of the nut, and are placed in sequence according to the order of the first lock washer 414, the first nut 413, the first lock washer 414 and the first nut 413. The first nut 413 is tightened to reach the designed tightening torque first, and when the second first nut 413 is tightened, the first first nut 413 is fixed by a wrench to make the second second nut 423 reach the designed tightening torque. The double nut assembly at the end of the first screw rod 411 can also effectively prevent the loosening of the nut, greatly increase the friction between the threads that the first nut 413 needs to overcome when rotating, and reduce the premature fatigue of the bolt.

[0044] Preferably, as Figure 6 As shown, the detection assembly 8 includes a strain gauge 81, a strain conditioner 83 and a strain acquisition instrument. The strain gauge 81 is pasted between the first screw rod 411 and the first rubber ring 412 by an adhesive. The strain gauge 81 is connected to the strain conditioner 83 by a wire 82. The strain conditioner 83 is connected to the strain acquisition instrument. In this embodiment, the strain gauge 81 is pasted on the curved surface of the first rubber ring 412 section of the first screw rod 411 and is tightly bonded by an adhesive. A thin layer of resin is applied to the surface of the strain gauge 81 for waterproofing. The wire 82 is led out from the opening of the rubber ring. After pasting, the first rubber ring 412 is slowly covered to cover the strain gauge 81. The wire 82 led out is connected to the strain conditioner 83. Four strain conditioners 83 are provided to divide the strain gauges 81 pasted on the first bolts 41 and the second bolts 42 into four areas, each with twenty wires 82. The four areas are the two ends of the waist circular plate 51, the two places of the first bolts 41 and the two places of the second bolts 42 in the middle. The interface 84 of the strain conditioner 83 is also divided into ten interface partitions 85, labeled A-J. After the four strain conditioners 83 are connected to the strain acquisition instrument, the changes in strain at each place of the screw rod can be read by a computer.

[0045] The further improvement of the welding-free and monitorable steel node low fatigue stress connecting structure is that the strain of the first screw rod 411 is monitored by the strain gauge 81 The expression is as follows:

[0046] ;

[0047] Wherein, t is the total thickness of the strain gauge 81 base and the adhesive layer, R is the radius of the first screw rod 411. During each on-site maintenance, whether the strain of the screw rod is abnormal can be monitored by the strain gauge 81 reading, so as to reduce the possibility of fatigue failure of the bolt, avoid personnel casualties and cause huge economic losses.

[0048] Preferably, as shown in Figure 3 , the inner wall of the combined plate 5 is a frosted surface 9 to increase the adhesion between the ECC 6 and the combined plate 5.

[0049] Preferably, as shown in Figure 2 , the end surface of the filled ECC 6 is flush with the end surface of the combined plate 5, and the end surface of the filled ECC 6 and the end surface of the combined plate 5 are coated with a waterproof layer 10. In this embodiment, the waterproof layer 10 is resin, which is applied to the outer surface of the ECC 6 after the ECC 6 uniformly fills the groove of the combined plate 5. The use of ECC 6 can not only uniformly disperse the stress of each bolt, but also increase the stiffness of the section to prevent the bending of the steel plate, which has certain economic benefits compared with the equal-thickness steel plate.

[0050] The welding-free and monitorable steel node low fatigue stress connecting structure can effectively reduce the stress concentration of the connecting assembly 4 in the region by the combined structure of the combined plate 5 and the ECC 6. The use of the ECC 6 can not only uniformly disperse the stress of each connecting assembly 4, but also increase the stiffness of the section to prevent the bending of the steel plate, which has certain economic benefits compared with the equal-thickness steel plate. The strain abnormality of the connecting assembly 4 can be monitored by the detection assembly 8 to timely find the fatigue failure of the steel truss tower node, reduce the risk of fatigue failure of the bolt, avoid the instability and collapse of the entire structure, cause personnel casualties and significant economic losses, and solve the technical problem that the steel truss tower node appears fatigue failure under the action of the fan vibration and wind load when the steel truss tower with a higher height is put into operation in the prior art.

[0051] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A weld-free, monitorable, low fatigue stress connection structure of steel joints, characterized by, The utility model provides a steel -concrete integrated component, steel -concrete integrated component, connecting assembly and detection assembly are arranged on the steel -concrete integrated component, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete 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integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and detection assembly, and the steel -concrete integrated component is connected with the connecting assembly and ​ ​ 2. The weld-free, monitoiable, steel-jointed, low fatigue stress connection structure of claim 1, wherein, ​ 3. The weld-free, monitoiable, steel-jointed, low fatigue stress connection of claim 2, wherein, ​ 4. The weld-free, monitoiable, steel-jointed, low fatigue stress connection of claim 2, wherein, The bent strip-shaped plate (52) comprises a lateral straight section (522), a bottom section (523) and a semicircular section (521) connected in sequence, the bottom section (523) is perpendicular to the lateral straight section (522), and the lateral straight section (522) and the semicircular section (521) form an opening for filling the ECC (6).

5. The weld-free, monitoiable, steel-jointed, low fatigue stress connection of claim 4, wherein, The number of the first bolts (41) and the number of the second bolts (42) are both multiple, multiple second bolts (42) are arranged near the lateral straight section (522) and along the length direction of the lateral straight section (522), and multiple first bolts (41) are arranged near the bottom section (523), the semicircular section (521) and the opening side of the groove and are arranged in a U shape.

6. The weld-free, monitoiable, steel-jointed, low fatigue stress connection of claim 1, wherein, the strain of the first screw (411) The expression is as follows: ； wherein, t is the total thickness of the strain gauge (81) substrate and adhesive layer, R is the radius of the first screw (411).

7. The weld-free, monitoiable, steel-jointed, low fatigue stress connection of claim 1, wherein, The inner wall of the combined plate (5) is a frosted surface (9).

8. The weld-free, monitoiable, steel-jointed, low fatigue stress connection structure of claim 1, wherein, The end surface of the ECC (6) after filling and the end surface of the combined plate (5) are flush, and the end surface of the ECC (6) after filling and the end surface of the combined plate (5) are coated with a waterproof layer (10).

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