Beam-column joint reinforcing device and method based on use function change

Abstract

The invention discloses a beam-column joint reinforcing device and method based on use function changes. The reinforcing device comprises a right-angle protection plate, a fan-shaped damping mechanism, a first inverted-cone-shaped chemical bolt and a second inverted-cone-shaped chemical bolt. The right-angle protective plate comprises transverse and longitudinal column connecting plates; the fan-shaped damping mechanism comprises a transverse end plate, a longitudinal end plate, a constraint steel plate, a shearing steel plate, a composite viscoelastic body and a lead core; the transverse end plate and the longitudinal end plate are connected to the inner side surfaces of the transverse beam connecting plate and the longitudinal beam connecting plate in a fitting manner; the end edges of the lower sides of the two constraint steel plates are fixedly connected with the longitudinal end plate, and a constraint space is formed between the two constraint steel plates; the end edge of the upper side of the shearing steel plate is fixedly connected with the transverse end plate; two mounting counter bores are formed in the overlapping area at intervals; the two elastomer filling spaces are respectively filled with the two composite viscoelastomers; and the two pencil leads are respectively inserted into the two mounting counter bores. The method comprises the steps of determining design parameters of the fan-shaped damping mechanism; and a reinforcing device is assembled at the beam-column joint. According to the device and method, the bearing strength of the beam-column joint can be remarkably improved.

Description

Technical Field

[0001] The invention belongs to the technical field of building reinforcement, and in particular relates to a beam-column node reinforcement device and method based on functional changes. Background Art

[0002] my country is in a period of rapid urbanization. In order to accelerate the process of modernization, many cities are demolishing old buildings on a large scale. However, high-rise buildings and roads are not the only model of urban modernization. With the development and maturity of the construction market, architectural design is no longer limited to new building design. The reinforcement and renovation design of existing buildings has also become one of the mainstream design directions.

[0003] At present, the design age of many existing building structures is relatively long, and they are far from meeting the current use requirements of the owners. For this reason, many buildings often need to be functionally modified to meet the current use needs. However, the functional changes of buildings are often accompanied by changes in load distribution and use conditions, which may cause the original structure to be unable to meet the new safety performance requirements. Therefore, it is necessary to safely reinforce the nodes of existing building structures to ensure that the old buildings can be recycled and efficiently used through the transformation of building use functions, and meet the ever-changing urban design needs. Although some safety reinforcement schemes in the prior art can improve the fixing effect of concrete columns and concrete beams to a certain extent, their construction process is relatively cumbersome, the structure of the reinforcement device used is also relatively complex, and the reinforcement effect is not ideal. At the same time, the later maintenance process is also relatively troublesome.

[0004] Therefore, how to provide an effective beam-column node reinforcement device and method to achieve the recycling and efficient use of old buildings and meet the needs of ever-changing urban design. Summary of the invention

[0005] In view of the problems existing in the above-mentioned prior art, the present invention provides a beam-column node reinforcement device and method based on changes in usage functions. The device has a simple structure, a convenient maintenance process, a low manufacturing cost, and a good reinforcement support capacity, which is conducive to greatly improving the reinforcement strength of the beam-column nodes, and can safely reinforce the nodes of existing building structures to ensure that the old buildings can be recycled and efficiently used through the transformation of the building usage functions; the method has a simple operation process and a small construction amount, can significantly improve the bearing strength of the beam-column nodes, can effectively save reinforcement costs, and can significantly improve construction efficiency.

[0006] In order to achieve the above-mentioned object, the present invention provides a beam-column node reinforcement device based on the use function change, the reinforcement device comprises a right-angle guard plate, a fan-shaped damping mechanism, an inverted cone chemical bolt 1 and an inverted cone chemical bolt 2;

[0007] The right-angle guard plate includes a transverse beam connecting plate and a longitudinal column connecting plate, wherein the transverse beam connecting plate is provided with a plurality of through holes A; and the longitudinal column connecting plate is provided with a plurality of through holes B;

[0008] The fan-shaped damping mechanism is arranged on the inner side of the right-angle guard plate, and comprises a transverse end plate, a longitudinal end plate, a restraining steel plate, a shearing steel plate, a composite viscoelastic body and a lead core;

[0009] The transverse end plate is closely connected to the inner side surface of the transverse beam connecting plate, and a plurality of through holes C are opened at positions corresponding to the plurality of through holes A;

[0010] The longitudinal end plate is closely connected to the inner side surface of the longitudinal column connecting plate, and a plurality of through holes D are opened at positions corresponding to the plurality of through holes B;

[0011] The restraining steel plate and the shearing steel plate are both fan-shaped steel plates, the outer arc surfaces of which are both located on the outer side, and are both arranged in the space between the transverse end plate and the longitudinal end plate, and at the same time, the center of the fan surface is located at the right angle vertex of the right angle guard plate;

[0012] The two restraining steel plates are distributed at intervals from each other, and the ends of the two steel plates on the lower side are fixedly connected to the inner side of the longitudinal end plate, and a fan-shaped buffer zone is left between the ends of the two steel plates on the upper side and the transverse end plate, so as to form a restraining space between the two steel plates;

[0013] The shear steel plate is located in the central area of ​​the constraint space, and its end edge on the upper side is fixedly connected to the inner side of the transverse end plate, and a fan-shaped buffer zone 2 is left between its end edge on the lower side and the longitudinal end plate; a fan-shaped damping action area is formed between the end edge on the upper side of the shear steel plate and the end edge on the lower side of the constraint steel plate; an overlapping area is formed at the overlapping part of the shear steel plate and the two constraint steel plates, and two elastic body filling spaces are formed between the shear steel plate and the two constraint steel plates in the overlapping area; two mounting countersunk holes extending in the thickness direction are provided at intervals in the central area of ​​the overlapping area along the arc extension direction, and the closed end of the mounting countersunk hole starts from the inside of one constraint steel plate, and the open end is located on the end surface of the other constraint steel plate, and the middle section passes through the two composite viscoelastic bodies and the shear steel plate in sequence;

[0014] Two composite viscoelastic bodies are respectively filled in the two elastic body filling spaces, and both end surfaces of each composite viscoelastic body are respectively bonded to the shear steel plate and the constraint steel plate;

[0015] The size of the lead core matches the size of the mounting countersunk hole, and the two lead cores are fixedly inserted into the two mounting countersunk holes respectively;

[0016] A plurality of inverted cone-shaped chemical bolts are sequentially inserted into the corresponding plurality of through holes A and the plurality of through holes C, and connect the transverse end plate and the transverse beam connecting plate to each other;

[0017] A plurality of inverted cone-shaped chemical bolts 2 are sequentially inserted into the corresponding plurality of through holes B and the plurality of through holes D, and connect the longitudinal end plate and the longitudinal column connecting plate to each other.

[0018] Furthermore, in order to improve the reinforcement effect, the right-angle guard plate is made of high-strength steel plate; the transverse end plate and the longitudinal end plate are both made of high-strength steel plate.

[0019] Furthermore, in order to improve the shear strength of the right-angle guard plate, the width of the transverse beam connecting plate in the right-angle guard plate is consistent with the width of the concrete beam to be connected, and the width of the longitudinal column connecting plate is consistent with the width of the concrete column to be connected.

[0020] As a preference, the distances between the sector buffer zone 1 and the sector buffer zone 2 are equal.

[0021] Furthermore, in order to ensure that the lead core can be reliably inserted into the positioning countersunk hole, an annular positioning recess is provided on the outer side of the open end of the mounting countersunk hole; the end of the lead core is fixedly connected with an annular positioning step at a position corresponding to the annular positioning recess, and when the lead core is inserted into the mounting countersunk hole, the annular positioning step is limitedly inserted into the annular positioning recess.

[0022] The present invention can effectively protect the internal fan-shaped damping mechanism through the arrangement of the right-angle guard plate, and can also serve as a reliable connection medium between the fan-shaped damping mechanism and the concrete beams and concrete columns. At the same time, it can also share a part of the load for the fan-shaped damping mechanism, which is beneficial to improve the deformation resistance between the concrete beam and column nodes. One side end edge of the two constraint steel plates is connected to the longitudinal end plate, and a fan-shaped buffer zone 1 is left between the other side end edge and the transverse end plate. At the same time, the shear steel plate is placed between the two constraint steel plates, and one side end edge is connected to the transverse end plate, and a fan-shaped buffer zone 2 is left between the other side end edge and the longitudinal end plate. On this basis, two composite viscoelastic bodies are arranged in the elastic body filling space between the shear steel plate and the two constraint steel plates, and then the lead core is sequentially passed through the first constraint steel plate, the first composite viscoelastic body, the shear steel plate, and the second composite viscoelastic body. The structure is a body, and is inserted into the second constraint steel plate. In this way, when the beam-column node of the column at the installed position is relatively deformed, the shear force can be applied to the two constraint steel plates and the shear steel plate through the transverse end plate and the longitudinal end plate, and then the two composite viscoelastic bodies and the lead core can jointly play a shear support role. It has a good ability to withstand beam shear force during use, and can effectively improve the shear strength at the beam-column node. At the same time, it can also withstand the tension generated between the beam and the column, and has good support capacity, which is conducive to ensuring the stability and reliability of the entire building. Using multiple inverted cone chemical bolts to connect the transverse end plate and the transverse beam connecting plate is conducive to improving the overall integration. At the same time, during the connection with the concrete beam, multiple inverted cone chemical bolts can be anchored into the concrete beam, so that the transverse end plate and the transverse beam connecting plate can be firmly and reliably connected to the concrete beam. Using multiple inverted cone chemical bolts 2 to connect the longitudinal end plate and the longitudinal column connecting plate is conducive to improving the overall integration. At the same time, multiple inverted cone chemical bolts 2 can be anchored into the concrete column during the connection with the concrete column, so that the longitudinal end plate and the longitudinal beam connecting plate can be firmly and reliably connected to the concrete column. Thus, the reinforcement device can be firmly and reliably connected to the beam-column node through the inverted cone chemical bolts 1 and 2, effectively forming an integral structure with the reinforcement device and the beam-column node. The device has a simple structure, convenient maintenance process, low manufacturing cost, and good reinforcement support capacity. It is conducive to greatly improving the reinforcement strength of the beam-column node, and can safely reinforce the nodes of the existing building structure to ensure that the recycling and efficient use of the old building can be achieved through the transformation of the building's use function.

[0023] The present invention also provides a beam-column node reinforcement method based on the use function change, using a beam-column node reinforcement device based on the use function change, comprising the following steps:

[0024] Step 1: According to the requirements of building function transformation and the actual situation of the building, the force analysis and calculation of the original building concrete frame structure are carried out, and the design parameters of the fan-shaped damping mechanism are determined according to the force analysis and calculation results;

[0025] S11: preliminarily determining the radius R of the fan-shaped damping action area in the fan-shaped damping mechanism;

[0026] S12: Calculate the ultimate shear force V at the column end corresponding to the plastic hinge failure at the beam end according to formula (1): b,y ;

[0027]

[0028] Where M b,y is the bending bearing capacity of the beam cross section; X1 is an unknown quantity, which is calculated by the structural mechanics force method; θ is the angle between the connecting line of the outer diameters at both ends of the fan-shaped damping action area and the beam or column in the fan-shaped damping mechanism calculation model; l b is the length of the concrete beam;

[0029] S13: Calculate the shear force V of the beam control section according to formula (2) k,b , and the beam control section shear force V k,b Compared with the shear bearing capacity of the beam section, if the beam controls the shear force V k,b If it is less than the shear bearing capacity of the beam section, the design requirements are met;

[0030] V k,b =V b,y -X1sinθ (2);

[0031] S14: According to formula (3), calculate the ultimate shear force V corresponding to the plastic hinge failure of the node column c,y ;

[0032]

[0033] Where M c,y is the bending bearing capacity of the column; h is the height of the concrete column;

[0034] S15: Calculate the ultimate shear force V corresponding to the shear failure of the node column according to formula (4) c,s ;

[0035] V c,s =V c,y (4);

[0036] S16: Calculate the column control section shear force V according to formula (5) k,c , and the column control section shear force V k,c Compared with the shear bearing capacity of the column section, if the column controls the shear force V k,cIf it is less than the shear bearing capacity of the column section, the design requirements are met;

[0037] V k,c =V c,y -X1sinθ (5);

[0038] S17: Calculate the shear force V acting on the node after reinforcement using the fan-shaped damping mechanism according to formula (6): j ;

[0039]

[0040] In the formula, h b is the beam height; s is the height of the beam compression zone;

[0041] S18: Calculation of shear capacity V of unreinforced nodes j,msst and with V j For comparison, if V j <V j,msst , it means that the shear force acting on the node is less than the shear bearing capacity of the node, which meets the design requirements;

[0042] S19: If S13, S16 and S18 all meet the design requirements, the fan-shaped damping mechanism meets the reinforcement use requirements. Otherwise, the design parameters of the fan-shaped damping mechanism are changed until the reinforcement use requirements are met.

[0043] Step 2: According to the reinforcement requirements, determine the installation position of the reinforcement device at the node of the concrete beam and the concrete column; at the same time, according to the design parameters obtained in step 1, complete the prefabrication of the reinforcement device in the factory;

[0044] Step 3: Grind the installation positions on the concrete beams and columns, and then use a blower to clean the surface of the installation positions; after grinding, use repair glue to fill the holes and sunken areas on the concrete surface, and use high-grade cement to fill the deeper holes;

[0045] Step 4: Apply structural adhesive evenly on the outer surfaces of the transverse beam connecting plate and the longitudinal column connecting plate in the right-angle guard plate, and then stick the right-angle guard plate in the corresponding installation area;

[0046] Step 5: using a punching tool to open a plurality of holes A on the concrete beam corresponding to the plurality of through holes A, and using a punching tool to open a plurality of holes B on the concrete column corresponding to the plurality of through holes B;

[0047] Step 6: Place the fan-shaped damping mechanism on the inner side of the right-angle guard plate, and at the same time, make the outer side surface of the transverse end plate fit with the inner side surface of the transverse beam connecting plate, and align the multiple through holes C with the multiple through holes A one by one, make the outer side surface of the longitudinal end plate fit with the inner side surface of the longitudinal column connecting plate, and align the multiple through holes D with the multiple through holes B one by one;

[0048] Step 7: Pass multiple inverted cone-shaped chemical bolts one through multiple through holes C and multiple through holes A, and implant them into multiple holes A. At the same time, fix the ends of the multiple inverted cone-shaped chemical bolts one with the surface of the transverse end plate by welding. Pass multiple inverted cone-shaped chemical bolts two through multiple through holes D (14) and multiple through holes B, and implant them into multiple holes B. At the same time, fix the ends of the multiple inverted cone-shaped chemical bolts two with the surface of the longitudinal end plate by welding.

[0049] In the present invention, in the design process of the fan-shaped damping mechanism, the beam control section shear force V k,b Less than the shear bearing capacity of the beam section, so that the column control section shear force V k,c is smaller than the shear capacity of the column section, making the shear capacity of the unreinforced node V j,msst Less than the shear force V acting on the node after reinforcement j , can scientifically and reasonably determine the design parameters of the fan-shaped damping mechanism, and thus can effectively ensure the reinforcement effect of the fan-shaped damping mechanism on the beam-column node. During the installation of the reinforcement device, the right-angle guard plate is first pasted on the beam-column node using structural adhesive, which not only facilitates the subsequent hole construction and the assembly of the fan-shaped damping mechanism, but also effectively increases the connection strength between the right-angle guard plate and the beam-column node, which is beneficial to improve the reinforcement effect of the beam-column node. A plurality of inverted cone chemical bolts 1 are used to anchor the transverse end plate and the transverse beam connecting plate to the concrete beam. At the same time, a plurality of inverted cone chemical bolts 2 are used to anchor the longitudinal end plate and the longitudinal column connecting plate to the concrete column. Further, the ends of the plurality of inverted cone chemical bolts 1 are fixedly connected to the surface of the transverse end plate by welding, and the ends of the plurality of inverted cone chemical bolts 2 are fixedly connected to the surface of the longitudinal end plate by welding. The reinforcement device can be reliably assembled on the beam-column node column, thereby ensuring the reinforcement effect during long-term use.

[0050] The present invention solves the problems of complex connection node structure and great construction difficulty in the prior art, and is particularly suitable for nodes that require reinforcement due to load increase caused by some adjustments or changes in usage functions, and the empirically calculated bearing capacity of the original building structure cannot meet the requirements of the new usage functions. The method has a simple operation process, a small construction amount, can significantly improve the bearing strength of beam-column nodes, can effectively save reinforcement costs, and significantly improve construction efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 It is a structural schematic diagram of the reinforcement device in the present invention;

[0052] Figure 2 It is a structural schematic diagram of the fan-shaped damping mechanism in the present invention;

[0053] Figure 3 is a front view of the fan-shaped damping mechanism of the present invention;

[0054] Figure 4 yes Figure 2 AA section view;

[0055] Figure 5 It is an assembly schematic diagram of the present invention;

[0056] Figure 6 It is a schematic diagram of a simplified calculation model of a node isolator in the present invention.

[0057] In the figure: 1. reinforcement device, 2. right-angle guard plate, 3. transverse beam connecting plate, 4. longitudinal column connecting plate, 5. fan-shaped damping mechanism, 6. transverse end plate, 7. longitudinal end plate, 8. constraint steel plate, 9. shear steel plate, 10. composite viscoelastic body, 11. lead core, 12. overlapping area, 13. through hole C, 14. through hole D, 15. mounting countersunk hole, 16. inverted cone type chemical bolt 1, 17. inverted cone type chemical bolt 2, 18. concrete beam, 19. concrete column. DETAILED DESCRIPTION

[0058] The present invention will be further described below in conjunction with the accompanying drawings.

[0059] like Figures 1 to 5 As shown, the present invention provides a beam-column node reinforcement device based on the use function change, the reinforcement device 1 includes a right-angle guard plate 2, a fan-shaped damping mechanism 5, an inverted cone-shaped chemical bolt 16 and an inverted cone-shaped chemical bolt 2 17;

[0060] The right-angle guard plate 2 includes a transverse beam connecting plate 3 and a longitudinal column connecting plate 4. The transverse beam connecting plate 3 is provided with a plurality of through holes A; the longitudinal column connecting plate 4 is provided with a plurality of through holes B;

[0061] The fan-shaped damping mechanism 5 is arranged on the inner side of the right-angle guard plate 2, and includes a transverse end plate 6, a longitudinal end plate 7, a restraining steel plate 8, a shearing steel plate 9, a composite viscoelastic body 10 and a lead core 11;

[0062] The transverse end plate 6 is closely connected to the inner side surface of the transverse beam connecting plate 3, and a plurality of through holes C13 are opened at positions corresponding to the plurality of through holes A;

[0063] The longitudinal end plate 7 is closely connected to the inner side surface of the longitudinal column connecting plate 4, and a plurality of through holes D14 are opened at positions corresponding to the plurality of through holes B;

[0064] The restraining steel plate 8 and the shearing steel plate 9 are both fan-shaped steel plates, the outer arc surfaces of which are both located on the outer side, and are both arranged in the space between the transverse end plate 6 and the longitudinal end plate 7, and at the same time, the center of the fan surface is located at the right angle vertex of the right angle guard plate 2;

[0065] The two restraining steel plates 8 are distributed at intervals from each other, and the ends of the two restraining steel plates 8 on the lower side are fixedly connected to the inner side of the longitudinal end plate 7, and a fan-shaped buffer zone is left between the ends of the two restraining steel plates 8 on the upper side and the transverse end plate 6, so as to form a restraining space between the two restraining steel plates 8;

[0066] The shear steel plate 9 is located in the central area of ​​the constraint space, and its upper end edge is fixedly connected to the inner side of the transverse end plate 6, and a fan-shaped buffer zone 2 is left between its lower end edge and the longitudinal end plate 7; a fan-shaped damping action area is formed between the upper end edge of the shear steel plate 9 and the lower end edge of the constraint steel plate 8; an overlapping area 12 is formed at the overlapping portion of the shear steel plate 9 and the two constraint steel plates 8, and two elastic body filling spaces are formed between the shear steel plate 9 and the two constraint steel plates 8 in the overlapping area 12; two mounting countersunk holes 15 extending in the thickness direction are provided at intervals in the central area of ​​the overlapping area 12 along the arc extension direction, and the closed end of the mounting countersunk hole 15 starts from the inside of one constraint steel plate 8, and the open end is located on the end surface of another constraint steel plate 10, and the middle section passes through the two composite viscoelastic bodies 10 and the shear steel plate 9 in sequence;

[0067] Two composite viscoelastic bodies 10 are respectively filled in the two elastic body filling spaces, and both end surfaces of each composite viscoelastic body 10 are respectively bonded to the shear steel plate 9 and the restraint steel plate 8;

[0068] The size of the lead core 11 matches the size of the mounting countersunk hole 15, and the two lead cores 11 are fixedly inserted into the two mounting countersunk holes 15 respectively;

[0069] A plurality of inverted cone-shaped chemical bolts 16 are sequentially inserted into the corresponding plurality of through holes A and the plurality of through holes C, and connect the transverse end plate 6 and the transverse beam connecting plate 3 to each other;

[0070] A plurality of inverted cone-shaped chemical bolts 17 are sequentially inserted into the corresponding plurality of through holes B and the plurality of through holes D, and connect the longitudinal end plate 7 and the longitudinal column connecting plate 4 to each other.

[0071] In order to improve the reinforcement effect, the right-angle guard plate 2 is made of high-strength steel plate; the transverse end plate 6 and the longitudinal end plate 7 are both made of high-strength steel plate.

[0072] In order to improve the shear strength of the right-angle guard plate, the width of the transverse beam connecting plate 3 in the right-angle guard plate 2 is consistent with the width of the concrete beam 18 to be connected. During the connection process, the transverse beam connecting plate 3 fits tightly with the concrete beam 18. The width of the longitudinal column connecting plate 4 is consistent with the width of the concrete column 19 to be connected. During the connection process, the longitudinal column connecting plate 4 fits tightly with the concrete column 19.

[0073] As a preference, the distances between the sector buffer zone 1 and the sector buffer zone 2 are equal.

[0074] In order to ensure that the lead core can be reliably inserted into the positioning countersunk hole, an annular positioning recess is provided on the outer side of the open end of the mounting countersunk hole 15; an annular positioning step is fixedly connected to the end of the lead core 11 at a position corresponding to the annular positioning recess, and when the lead core 11 is inserted into the mounting countersunk hole 15, the annular positioning step is limitedly inserted into the annular positioning recess.

[0075] The present invention can effectively protect the internal fan-shaped damping mechanism through the arrangement of the right-angle guard plate, and can also serve as a reliable connection medium between the fan-shaped damping mechanism and the concrete beams and concrete columns. At the same time, it can also share a part of the load for the fan-shaped damping mechanism, which is beneficial to improve the deformation resistance between the concrete beam and column nodes. One side end edge of the two constraint steel plates is connected to the longitudinal end plate, and a fan-shaped buffer zone 1 is left between the other side end edge and the transverse end plate. At the same time, the shear steel plate is placed between the two constraint steel plates, and one side end edge is connected to the transverse end plate, and a fan-shaped buffer zone 2 is left between the other side end edge and the longitudinal end plate. On this basis, two composite viscoelastic bodies are arranged in the elastic body filling space between the shear steel plate and the two constraint steel plates, and then the lead core is sequentially passed through the first constraint steel plate, the first composite viscoelastic body, the shear steel plate, and the second composite viscoelastic body. The structure is a body, and is inserted into the second constraint steel plate. In this way, when the beam-column node of the column at the installed position is relatively deformed, the shear force can be applied to the two constraint steel plates and the shear steel plate through the transverse end plate and the longitudinal end plate, and then the two composite viscoelastic bodies and the lead core can jointly play a shear support role. It has a good ability to withstand beam shear force during use, and can effectively improve the shear strength at the beam-column node. At the same time, it can also withstand the tension generated between the beam and the column, and has good support capacity, which is conducive to ensuring the stability and reliability of the entire building. Using multiple inverted cone chemical bolts to connect the transverse end plate and the transverse beam connecting plate is conducive to improving the overall integration. At the same time, during the connection with the concrete beam, multiple inverted cone chemical bolts can be anchored into the concrete beam, so that the transverse end plate and the transverse beam connecting plate can be firmly and reliably connected to the concrete beam. Using multiple inverted cone chemical bolts 2 to connect the longitudinal end plate and the longitudinal column connecting plate is conducive to improving the overall integration. At the same time, multiple inverted cone chemical bolts 2 can be anchored into the concrete column during the connection with the concrete column, so that the longitudinal end plate and the longitudinal beam connecting plate can be firmly and reliably connected to the concrete column. Thus, the reinforcement device can be firmly and reliably connected to the beam-column node through the inverted cone chemical bolts 1 and 2, effectively forming an integral structure with the reinforcement device and the beam-column node. The device has a simple structure, convenient maintenance process, low manufacturing cost, and good reinforcement support capacity. It is conducive to greatly improving the reinforcement strength of the beam-column node, and can safely reinforce the nodes of the existing building structure to ensure that the recycling and efficient use of the old building can be achieved through the transformation of the building's use function.

[0076] The present invention also provides a beam-column node reinforcement method based on the use function change, using a beam-column node reinforcement device based on the use function change, comprising the following steps:

[0077] Step 1: According to the requirements of building function transformation and the actual situation of the building, the force analysis and calculation of the original building concrete frame structure are performed, and the design parameters of the fan-shaped damping mechanism 5 are determined according to the force analysis and calculation results;

[0078] like Figure 6 As shown, considering the influence of the bending deformation of beams and columns on the internal forces and deformations of the structure, and ignoring the axial deformation and shear deformation of beams and columns, it can be considered that the axial force of the node column has no contribution to the bending moment of the node, so it is not considered. Assuming that the inflection point of the upper and lower columns of the node is located at the midpoint of the column, the bottom of the column is equivalent to a fixed hinge support. Based on the above assumptions, a simplified calculation model of the node isolation body is established, and then the unknown quantity X1 is calculated using the structural mechanics force method, so that the internal forces of the model beams and columns under the action of unit shear force can be calculated;

[0079] Specifically, the calculation process of the design parameters of the fan-shaped damping mechanism 5 is as follows:

[0080] S11: preliminarily determining the radius R of the fan-shaped damping action area in the fan-shaped damping mechanism 5;

[0081] S12: Calculate the ultimate shear force V at the column end corresponding to the plastic hinge failure at the beam end according to formula (1): b,y ;

[0082]

[0083] Where M b,y is the bending bearing capacity of the beam cross section; X1 is an unknown quantity, which is calculated by the structural mechanics force method; θ is the angle between the connecting line of the outer diameters of the two ends of the fan-shaped damping action area in the calculation model of the fan-shaped damping mechanism 5 and the beam or column; l b is the length of the concrete beam 18;

[0084] S13: Calculate the shear force V of the beam control section according to formula (2) k,b , and the beam control section shear force V k,b Compared with the shear bearing capacity of the beam section, if the beam controls the shear force V k,b If it is less than the shear bearing capacity of the beam section, the design requirements are met;

[0085] V k,b =V b,y -X1sinθ (2);

[0086] S14: According to formula (3), calculate the ultimate shear force V corresponding to the plastic hinge failure of the node column c,y ;

[0087]

[0088] Where M c,yis the bending bearing capacity of the column; h is the height of the concrete column 19;

[0089] S15: Calculate the ultimate shear force V corresponding to the shear failure of the node column according to formula (4) c,s ;

[0090] V c,s =V c,y (4);

[0091] S16: Calculate the column control section shear force V according to formula (5) k,c , and the column control section shear force V k,c Compared with the shear bearing capacity of the column section, if the column controls the shear force V k,c If it is less than the shear bearing capacity of the column section, the design requirements are met;

[0092] V k,c =V c,y -X1sinθ (5);

[0093] S17: Calculate the shear force V of the node after reinforcement using the fan-shaped damping mechanism 5 according to formula (6): j ;

[0094]

[0095] In the formula, h b is the beam height; s is the height of the beam compression zone;

[0096] S18: Calculation of shear capacity V of unreinforced nodes j,msst and with V j For comparison, if V j <V j,msst , it means that the shear force acting on the node is less than the shear bearing capacity of the node, which meets the design requirements;

[0097] S19: If S13, S16 and S18 all meet the design requirements, the fan-shaped damping mechanism 5 meets the reinforcement use requirements, otherwise, the design parameters of the fan-shaped damping mechanism 5 are changed until the reinforcement use requirements are met;

[0098] Step 2: According to the reinforcement requirements, determine the installation position of the reinforcement device 1 at the node of the concrete beam 18 and the concrete column 19; at the same time, according to the design parameters obtained in step 1, complete the prefabrication of the reinforcement device 1 in the factory;

[0099] Step 3: Grind the installation positions on the concrete beam 18 and the concrete column 19, and then use a blower to clean the surface of the installation position; after grinding, use repair glue to fill the holes and sunken areas on the concrete surface, and use high-grade cement to fill the deep holes;

[0100] Step 4: Evenly apply structural adhesive on the outer surfaces of the transverse beam connecting plate 3 and the longitudinal column connecting plate 4 in the right-angle guard plate 2, and then stick the right-angle guard plate 2 in the corresponding installation area;

[0101] Step 5: using a punching tool to open a plurality of holes A on the concrete beam 18 corresponding to the plurality of through holes A, and using a punching tool to open a plurality of holes B on the concrete column 19 corresponding to the plurality of through holes B;

[0102] Step 6: Place the fan-shaped damping mechanism 5 on the inner side of the right-angle guard plate 2, and at the same time, make the outer side surface of the transverse end plate 6 fit with the inner side surface of the transverse beam connecting plate 3, and align the multiple through holes C13 with the multiple through holes A one by one, make the outer side surface of the longitudinal end plate 7 fit with the inner side surface of the longitudinal column connecting plate 4, and align the multiple through holes D14 with the multiple through holes B one by one;

[0103] Step seven: Pass multiple inverted cone chemical bolts 16 through multiple through holes C13 and multiple through holes A respectively, and implant them into multiple holes A respectively. Meanwhile, fix the ends of multiple inverted cone chemical bolts 16 to the surface of the transverse end plate 6 by welding. Pass multiple inverted cone chemical bolts 2 17 through multiple through holes D14 and multiple through holes B respectively, and implant them into multiple holes B respectively. Meanwhile, fix the ends of multiple inverted cone chemical bolts 2 17 to the surface of the longitudinal end plate 7 by welding.

[0104] In the present invention, in the design process of the fan-shaped damping mechanism, the beam control section shear force V k,b Less than the shear bearing capacity of the beam section, so that the column control section shear force V k,c is smaller than the shear capacity of the column section, making the shear capacity of the unreinforced node V j,msst Less than the shear force V acting on the node after reinforcement j, can scientifically and reasonably determine the design parameters of the fan-shaped damping mechanism, and thus can effectively ensure the reinforcement effect of the fan-shaped damping mechanism on the beam-column node. During the installation of the reinforcement device, the right-angle guard plate is first pasted on the beam-column node using structural adhesive, which not only facilitates the subsequent hole construction and the assembly of the fan-shaped damping mechanism, but also effectively increases the connection strength between the right-angle guard plate and the beam-column node, which is beneficial to improve the reinforcement effect of the beam-column node. A plurality of inverted cone chemical bolts 1 are used to anchor the transverse end plate and the transverse beam connecting plate to the concrete beam. At the same time, a plurality of inverted cone chemical bolts 2 are used to anchor the longitudinal end plate and the longitudinal column connecting plate to the concrete column. Further, the ends of the plurality of inverted cone chemical bolts 1 are fixedly connected to the surface of the transverse end plate by welding, and the ends of the plurality of inverted cone chemical bolts 2 are fixedly connected to the surface of the longitudinal end plate by welding. The reinforcement device can be reliably assembled on the beam-column node column, thereby ensuring the reinforcement effect during long-term use.

[0105] The present invention solves the problems of complex connection node structure and great construction difficulty in the prior art, and is particularly suitable for nodes that require reinforcement due to load increase caused by some adjustments or changes in usage functions, and the empirically calculated bearing capacity of the original building structure cannot meet the requirements of the new usage functions. The method has a simple operation process, a small construction amount, can significantly improve the bearing strength of beam-column nodes, can effectively save reinforcement costs, and significantly improve construction efficiency.

Claims

1. A beam-column node reinforcement device based on functional change, the reinforcement device (1) comprising a right-angle guard plate (2), characterized in that: The reinforcement device (1) further comprises a fan-shaped damping mechanism (5), an inverted cone-shaped chemical bolt 1 (16) and an inverted cone-shaped chemical bolt 2 (17); The right-angle guard plate (2) comprises a transverse beam connecting plate (3) and a longitudinal column connecting plate (4); the transverse beam connecting plate (3) is provided with a plurality of through holes A; the longitudinal column connecting plate (4) is provided with a plurality of through holes B; The fan-shaped damping mechanism (5) is arranged on the inner side of the right-angle guard plate (2), and comprises a transverse end plate (6), a longitudinal end plate (7), a restraining steel plate (8), a shear steel plate (9), a composite viscoelastic body (10) and a lead core (11); The transverse end plate (6) is closely connected to the inner side surface of the transverse beam connecting plate (3), and a plurality of through holes C (13) are opened at positions corresponding to the plurality of through holes A; The longitudinal end plate (7) is closely connected to the inner side surface of the longitudinal column connecting plate (4), and a plurality of through holes D (14) are opened at positions corresponding to the plurality of through holes B; The restraining steel plate (8) and the shearing steel plate (9) are both fan-shaped steel plates, the outer arc surfaces of which are both located on the outer side, and are both arranged in the space between the transverse end plate (6) and the longitudinal end plate (7), and at the same time, the center of the fan surface is located at the right angle vertex of the right angle guard plate (2); The two restraining steel plates (8) are spaced apart from each other, and their lower ends are fixedly connected to the inner side of the longitudinal end plate (7), and a fan-shaped buffer zone is left between their upper ends and the transverse end plate (6), so as to form a restraining space between the two restraining steel plates (8); The shear steel plate (9) is located in the central area of ​​the constraint space, and its upper end edge is fixedly connected to the inner side of the transverse end plate (6), and a fan-shaped buffer zone 2 is left between its lower end edge and the longitudinal end plate (7); a fan-shaped damping action zone is formed between the upper end edge of the shear steel plate (9) and the lower end edge of the constraint steel plate (8); an overlapping area (12) is formed at the overlapping portion of the shear steel plate (9) and the two constraint steel plates (8), and two elastic body filling spaces are formed between the shear steel plate (9) and the two constraint steel plates (8) in the overlapping area (12); two mounting countersunk holes (15) extending in the thickness direction are provided at intervals in the central area of ​​the overlapping area (12) along the arc extension direction, the closed end of the mounting countersunk hole (15) starts from the inside of one constraint steel plate (8), and the open end is located on the end surface of another constraint steel plate (10), and the middle section passes through the two composite viscoelastic bodies (10) and the shear steel plate (9) in sequence; Two composite viscoelastic bodies (10) are respectively filled in the two elastic body filling spaces, and both end surfaces of each composite viscoelastic body (10) are respectively bonded to the shear steel plate (9) and the restraining steel plate (8); The size of the lead core (11) matches the size of the mounting countersunk hole (15), and the two lead cores (11) are respectively fixedly inserted into the two mounting countersunk holes (15); A plurality of inverted cone-shaped chemical bolts (16) are sequentially inserted into the corresponding plurality of through holes A and the plurality of through holes C, and connect the transverse end plate (6) and the transverse beam connecting plate (3) to each other; A plurality of inverted cone-shaped chemical bolts (17) are sequentially inserted into the corresponding plurality of through holes B and the plurality of through holes D, and connect the longitudinal end plate (7) and the longitudinal column connecting plate (4) to each other.

2. A beam-column joint reinforcement device based on functional change according to claim 1 or 2, characterized in that: The right-angle guard plate (2) is made of high-strength steel plate; the transverse end plate (6) and the longitudinal end plate (7) are both made of high-strength steel plate.

3. A beam-column joint reinforcement device based on functional change according to claim 1 or 2, characterized in that: The width of the transverse beam connecting plate (3) in the right-angle guard plate (2) is consistent with the width of the concrete beam (18) to be connected, and the width of the longitudinal column connecting plate (4) is consistent with the width of the concrete column (19) to be connected.

4. A beam-column joint reinforcement device based on functional change according to claim 3, characterized in that: The distances between the first sector buffer zone and the second sector buffer zone are equal.

5. A beam-column joint reinforcement device based on functional change according to claim 4, characterized in that: An annular positioning recess is arranged outside the open end of the mounting countersunk hole (15); an annular positioning step is fixedly connected to the end of the lead core (11) at a position corresponding to the annular positioning recess; when the lead core (11) is inserted into the mounting countersunk hole (15), the annular positioning step is inserted into the annular positioning recess with limiting position.

6. A beam-column joint reinforcement method based on use function change, using a beam-column joint reinforcement device based on use function change as claimed in any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1: According to the requirements of the building function transformation and the actual situation of the building, the force analysis and calculation of the original building concrete frame structure are carried out, and the design parameters of the fan-shaped damping mechanism (5) are determined according to the force analysis and calculation results; S11: preliminarily determining the radius R of the fan-shaped damping action area in the fan-shaped damping mechanism (5); S12: Calculate the ultimate shear force V at the column end corresponding to the plastic hinge failure at the beam end according to formula (1): b,y ; Where M b,y is the bending bearing capacity of the beam cross section; X1 is an unknown quantity, which is calculated by the structural mechanics force method; θ is the angle between the connecting line of the outer diameters of the two ends of the fan-shaped damping action area in the calculation model of the fan-shaped damping mechanism (5) and the beam or column; l b is the length of the concrete beam (18); S13: Calculate the shear force V of the beam control section according to formula (2) k,b , and the beam control section shear force V k,b Compared with the shear bearing capacity of the beam section, if the beam controls the shear force V k,b If it is less than the shear bearing capacity of the beam section, the design requirements are met; V k,b =V b,y -X1sinθ(2); S14: According to formula (3), calculate the ultimate shear force V corresponding to the plastic hinge failure of the node column c,y ; Where M c,y is the bending bearing capacity of the column; h is the height of the concrete column (19); S15: Calculate the ultimate shear force V corresponding to the shear failure of the node column according to formula (4) c,s ; V c,s =V c,y (4); S16: Calculate the column control section shear force V according to formula (5) k,c , and the column control section shear force V k,c Compared with the shear bearing capacity of the column section, if the column controls the shear force V k,c If it is less than the shear bearing capacity of the column section, the design requirements are met; V k,c =V c,y -X1sinθ(5); S17: Calculate the shear force V of the node after reinforcement using the fan-shaped damping mechanism (5) according to formula (6): j ; In the formula, h b is the beam height; s is the height of the beam compression zone; S18: Calculation of shear capacity V of unreinforced nodes j,msst and with V j For comparison, if V j <V j,msst , it means that the shear force acting on the node is less than the shear bearing capacity of the node, which meets the design requirements; S19: If S13, S16 and S18 all meet the design requirements, the fan-shaped damping mechanism (5) meets the reinforcement use requirements; otherwise, the design parameters of the fan-shaped damping mechanism (5) are changed until the reinforcement use requirements are met; Step 2: According to the reinforcement requirements, the installation position of the reinforcement device (1) is determined at the node of the concrete beam (18) and the concrete column (19); at the same time, according to the design parameters obtained in step 1, the prefabrication of the reinforcement device (1) is completed in the factory; Step 3: Grind the installation positions on the concrete beam (18) and the concrete column (19), and then use a blower to clean the surface of the installation positions; after the grinding process, use repair glue to fill the holes and sunken areas on the concrete surface, and use high-grade cement to fill the deep holes; Step 4: Evenly apply structural adhesive on the outer surfaces of the transverse beam connecting plate (3) and the longitudinal column connecting plate (4) in the right-angle guard plate (2), and then stick the right-angle guard plate (2) in the corresponding installation area; Step 5: using a punching tool to open a plurality of holes A on the concrete beam (18) corresponding to the plurality of through holes A, and using a punching tool to open a plurality of holes B on the concrete column (19) corresponding to the plurality of through holes B; Step 6: Place the fan-shaped damping mechanism (5) on the inner side of the right-angle guard plate (2), and at the same time, make the outer side surface of the transverse end plate (6) fit with the inner side surface of the transverse beam connecting plate (3), and align the plurality of through holes C (13) with the plurality of through holes A one by one, make the outer side surface of the longitudinal end plate (7) fit with the inner side surface of the longitudinal column connecting plate (4), and align the plurality of through holes D (14) with the plurality of through holes B one by one; Step 7: Pass multiple inverted cone-shaped chemical bolts 1 (16) through multiple through holes C (13) and multiple through holes A, and implant them into multiple holes A. At the same time, fix the ends of the multiple inverted cone-shaped chemical bolts 1 (16) to the surface of the transverse end plate (6) by welding; pass multiple inverted cone-shaped chemical bolts 2 (17) through multiple through holes D (14) and multiple through holes B, and implant them into multiple holes B. At the same time, fix the ends of the multiple inverted cone-shaped chemical bolts 2 (17) to the surface of the longitudinal end plate (7) by welding.

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