CN109138475B - Method for improving direct shear bearing capacity of reinforced concrete member - Google Patents
Method for improving direct shear bearing capacity of reinforced concrete member Download PDFInfo
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Abstract
The invention provides a method for improving the direct shear bearing capacity of a reinforced concrete member, which is characterized in that a steel plate is fixed on the surface of a pre-reinforced direct shear surface part of the reinforced concrete member to improve the direct shear bearing capacity of the reinforced concrete member, the sectional area of the steel plate is determined according to the direct shear bearing capacity of the unreinforced reinforced concrete member and the direct shear bearing capacity required by the reinforced concrete member, and the thickness of the steel plate is determined according to the sectional area of the steel plate and the length of the direct shear surface. The method can accurately and quantitatively determine the using amount of the steel plates for reinforcement according to various physical parameters of the reinforced concrete member to be reinforced and the reinforcement effect required to be achieved, the reinforcement effect is high, and the method is simple, clear and easy to use.
Description
Technical Field
The invention belongs to the technical field of concrete structure reinforcement, and relates to a method for improving the direct shear bearing capacity of a reinforced concrete member.
Background
Reinforced concrete structures are one of the most widely used structural forms at present. Under load, concrete members have a variety of basic failure modes. Among them, direct shear damage is a common form, and often occurs: (1) sections with fine cracks or abrupt changes in material (such as new and old concrete interfaces); or (2) a cross section that withstands large shear transfer. At present, a large number of sections belonging to the section (1) exist in a prefabricated concrete structure which is vigorously pushed in China. If the straight shear bearing capacity of the member is insufficient due to the reasons of house function improvement and the like, the conventional solution is to improve the straight shear bearing capacity of the concrete member.
The existing method for reinforcing the direct shear of the reinforced concrete member comprises the following steps: the publication number is CN106567555A, the invention name is a method for improving the direct shear bearing capacity of a reinforced concrete member by obliquely pasting a fiber composite material on the surface, and the method improves the direct shear force by obliquely pasting the fiber composite material and the direct shear surface; the publication number is CN104153594A, the invention name is a method for improving the direct shear bearing capacity of a reinforced concrete member, and the method improves the direct shear force by vertically sticking a fiber composite material to a direct shear surface.
Disclosure of Invention
The invention aims to provide a method for improving the direct shear bearing capacity of a reinforced concrete member, which can accurately determine the area and the thickness of a steel plate for reinforcing the reinforced concrete member and has high reinforcing effect.
In order to achieve the above purpose, the solution of the invention is as follows:
a method for improving the direct shear bearing capacity of a reinforced concrete member is characterized in that a steel plate is fixed on the surface of a pre-reinforced direct shear surface part of the reinforced concrete member to improve the direct shear bearing capacity of the reinforced concrete member, the sectional area of the steel plate is determined according to the direct shear bearing capacity of the unreinforced reinforced concrete member and the direct shear bearing capacity which needs to be achieved by the reinforced concrete member, and the thickness of the steel plate is determined according to the sectional area of the steel plate and the length of the direct shear surface;
the sectional area Ap of the steel plate is determined by the following formula:
Ap＝(VERC-VRC)/(1.083σp+τp)
wherein, VERCShows the direct shear bearing capacity (N, V) of the reinforced concrete memberRCRepresenting the straight shear bearing capacity (N), σ, of the unreinforced reinforced concrete memberpRepresents a transverse tensile stress (MPa) of the steel sheet; tau ispRepresents the vertical shear stress (MPa) of the steel sheet.
The unreinforced reinforced concrete member has a straight shear bearing capacity VRCThe determination formula of (1) is as follows:
VRC＝0.097Acvfc+0.752Avffy，
wherein, VRCShowing the straight shear bearing capacity (N), A of the unreinforced reinforced concrete membercvRepresents the cross-sectional area (mm) of the concrete at the straight shear plane2)，AvfRepresents the cross-sectional area (mm) of the direct-shear steel bar at the direct-shear plane2)，fcRepresents the compressive strength (MPa) of concrete; f. ofyIndicates the reinforcing bar yield strength (MPa).
Transverse tensile stress sigma of the steel platepAnd the vertical shear stress tau of the steel platepRespectively as follows:
σp＝Epεp＝Ep(108+28.6ρ+12.9λ)，
τp＝Gpγp＝Gp(306+94.1ρ-34.4λ)，
wherein E ispRepresents the modulus of elasticity (MPa), G, of the steel sheetpRepresents the shear modulus (MPa), ε of the steel sheetpRepresents the effective transverse tensile strain, gamma, of the steel sheetpThe effective vertical shear strain of the steel plate is shown, rho represents the reinforcement ratio of the direct-shear reinforcing steel bar at the direct-shear surface, and lambda is ApA represents the steel plate reinforcement ratio, and A represents the area of the direct shear plane (mm)2)。
The determination formula of the thickness w of the steel plate is as follows:
w＝Ap/l
wherein l is a straight shear plane length (mm).
The steel plates are fixed at the direct shear surface of the reinforced concrete member through reinforcing bolts, and the number of the reinforcing bolts is more than two;
the number of the steel plates is two, and the reinforcing bolts penetrate through the reinforced concrete member to fix the two steel plates on two sides of the reinforced concrete member.
The reinforcing bolts are arranged at the positions, 80-200 mm away from the straight shearing surface, of the two sides of the straight shearing surface, and the distance between every two reinforcing bolts is 50-100 mm.
Preferably, the reinforcing bolts are arranged at positions 100mm away from the straight shearing surface on both sides of the straight shearing surface, and the distance between every two reinforcing bolts is 60 mm.
And the contact surface of the reinforcing bolt and the reinforced concrete member is filled with bar planting glue.
And placing the reinforced concrete member reinforced by the steel plate in dry air, standing for 24-36 hours at normal temperature, and after the bar-planting glue is hardened, jointly bearing the force on the steel plate and the reinforced concrete member.
The step of fixing the steel plate at the direct shear surface of the reinforced concrete member by a reinforcing bolt comprises:
leveling the concrete surface, polishing and leveling the concrete surface on two sides of the direct shear surface of the reinforced concrete member by using a disc type polishing machine, and blowing off surface floating dust by using a blower;
secondly, positioning, punching and cleaning the holes, positioning the reinforcing bolts according to a method that the reinforcing bolts are arranged at positions 80-200 mm away from the straight shearing surface on two sides of the straight shearing surface, and the distance between every two reinforcing bolts is 50-100 mm, punching holes on the reinforced concrete member by using a small-diameter drill bit at the positioning position, then reaming the holes by using a large-diameter drill bit, and finally cleaning dust in the holes and floating dust on the walls of the holes by using an air pump and an air blowing nozzle;
thirdly, adhering a sealing gasket, smearing a proper amount of transparent silica gel around the hole, and adhering a silica gel gasket to prevent the bar-planting glue from leaking laterally during glue injection;
fourthly, mounting reinforcing parts, mounting the steel plate and parts such as the reinforcing bolts and the glue injection rings on the surface of the reinforced concrete member, accurately adjusting the position of the steel plate, and temporarily fastening the reinforcing bolts to fix the steel plate;
fifthly, applying pretightening force, and tightening the reinforcing bolt by using a torque wrench to apply the pretightening force;
and sixthly, injecting glue, namely injecting the bar-planting glue through the gasket by using a glue injection gun, injecting the glue from the glue injection hole of the glue injection ring on one side, overflowing the glue from the glue injection hole of the glue injection ring on the other side of the reinforced concrete member, and cleaning the surface of the reinforced concrete member after glue injection is finished.
The steel sheet is preferably made of a Q345 steel material.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the method of the invention improves the straight shear bearing capacity of the reinforced concrete member by fixing the steel plate on the surface of the pre-reinforced straight shear surface part of the reinforced concrete member, accurately and quantitatively determines the using amount of the steel plate for reinforcement according to each physical parameter of the reinforced concrete member to be reinforced and the reinforcement effect required to be achieved, the reinforcement effect is high-efficiency, and the method is simple, clear and easy to use.
Drawings
Fig. 1 is a front view of an unreinforced reinforced concrete structure.
Fig. 2 is a front view of the reinforced concrete member after reinforcement.
Fig. 3 is a side view of a reinforced concrete member after reinforcement.
Fig. 4 is a top view of the reinforced concrete member after reinforcement.
Reference numerals:
the reinforced concrete member comprises a reinforced concrete member 1, a direct shear surface 2, direct shear steel bars 3, steel plates 4, reinforcing bolts 5, bar planting glue 6 and glue injection holes 7.
Detailed Description
The invention will be further described with reference to examples of embodiments shown in the drawings.
The invention provides a method for improving the direct shear bearing capacity of a reinforced concrete member, which improves the direct shear bearing capacity of the reinforced concrete member by fixing steel plates on the surface of a pre-reinforced direct shear surface part of the reinforced concrete member, and accurately and quantitatively determines the using amount of the steel plates for reinforcement according to various physical parameters of the reinforced concrete member to be reinforced and the reinforcement effect required to be achieved so as to improve the direct shear bearing capacity of the reinforced concrete member.
The principle of reinforcing the direct shear force of the Z-shaped reinforced concrete member by adopting the steel plate is as follows:
when the reinforced concrete member is subjected to direct shear failure on a certain vertical section, two reactions are necessarily carried out, namely the transverse horizontal expansion deformation of the concrete in the area near the section and the vertical displacement generated by the slippage of the left side and the right side of the direct shear surface, and accordingly, the direct shear resistance of the reinforced concrete member is derived from 5 components: cohesive force and friction force of an interface between the aggregate and the mortar, aggregate biting force, shear expansion force caused by transverse expansion deformation and pin bolt effect of the steel bar.
After the steel plate is anchored on the surface of the reinforced concrete member through the reinforcing bolt, two reactions of the reinforced concrete member under direct shear load also influence the stress and deformation of the steel plate, on one hand, the steel plate generates transverse horizontal constraint force to limit the transverse horizontal expansion deformation of the reinforced concrete member, and the transverse horizontal constraint force generates transverse clamping force to cause the increase of the first 4 components of the direct shear resistance, thereby indirectly increasing the direct shear resistance; on the other hand, the steel plate directly generates vertical resistance to resist vertical displacement generated by slippage on the left side and the right side of the direct shear surface, and the direct shear resistance is provided.
Therefore, the method for reinforcing the reinforced concrete member is directly and clearly used and has obvious effect.
The concrete description is as follows:
as shown in fig. 1, the solid vertical arrowed lines indicate the direct shear force F exerted on the Z-shaped reinforced concrete member 1, and the straight shear plane 2 is shown by the dashed lines in fig. 1. Under the action of direct shear force, the Z-shaped reinforced concrete member 1 undergoes transverse expansion deformation and relative vertical displacement on the left side and the right side of the direct shear surface, and the deformation directions are respectively shown as horizontal and vertical dotted lines with arrows in fig. 1.
As shown in fig. 2, which is a front view of the reinforced concrete member after reinforcement, a steel plate 4 is anchored to the surface of the reinforced concrete member by a reinforcement bolt 5, the thick solid line in fig. 2 indicates the straight-shear reinforcement 3 built in the reinforced concrete member, the steel plate 4 is deformed, and the horizontal clamping force causes the first 4 components of the direct-shear resistance to increase, thereby indirectly increasing the direct-shear resistance. The steel plate 4 also generates vertical resistance to directly resist external loads.
As shown in fig. 3 and 4, in the structure of the reinforced concrete member after reinforcement, the reinforcing bolt 5 is used for penetrating through the reinforced concrete member, two steel plates 4 are respectively anchored on two sides of the reinforced concrete member, the reinforcing bolt 5 is connected with concrete through the peripheral bar-planting glue 6, the bar-planting glue 6 is injected through the glue injection hole 7, the reinforcing bolt 5 cannot slide under the action of external force, and therefore the reinforcing bolt 5 is ensured to be firmly combined with the peripheral concrete.
Based on the principle and the illustration, the method for improving the direct shear bearing capacity of the reinforced concrete member by adopting the bolt anchoring steel plate comprises the following steps:
(1) a steel plate determining step: determining the sectional area of a steel plate fixed at the direct shearing surface of the reinforced concrete member according to the direct shearing bearing capacity and the intended reinforcement effect of the unreinforced reinforced concrete member and the direct shearing bearing capacity which needs to be achieved by the reinforced concrete member, and determining the thickness of the steel plate according to the sectional area of the steel plate and the length of the direct shearing surface; the steel plate material selected in this embodiment is Q345 steel.
(2) Leveling the concrete surface, polishing and leveling the concrete surface on two sides of the direct shear surface of the reinforced concrete member by using a disc type polishing machine, and blowing off surface floating dust by using a blower;
(3) and positioning, punching and hole cleaning, wherein the reinforcing bolts are arranged at positions which are 100mm away from the straight shearing surface on two sides of the straight shearing surface in the embodiment, and each side of the reinforcing bolts is respectively provided with 4 reinforcing bolts. The distance between every two reinforcing bolts is 60mm, a small-diameter drill bit is used for punching a through hole on the reinforced concrete member at the positioning position, then a large-diameter drill bit is used for reaming the hole, and finally an air pump and an air blowing nozzle are used for cleaning dust in the hole and floating dust on the wall of the hole;
(4) adhering a sealing gasket, smearing a proper amount of transparent silica gel around the hole, and adhering a silica gel gasket to prevent the bar-planting glue from leaking laterally during glue injection;
(5) installing reinforcing parts, namely installing steel plates and parts such as the reinforcing bolts and the glue injection rings on the surfaces of the reinforced concrete members, accurately adjusting the positions of the steel plates, and temporarily fastening the reinforcing bolts to fix the steel plates;
(6) applying a pre-tightening force, and tightening the reinforcing bolt by using a torque wrench to apply the pre-tightening force;
(7) and (3) injecting glue, namely injecting the bar-planting glue through the gasket by using a glue injection gun, injecting the glue from the glue injection hole of the glue injection ring on one side, overflowing the glue from the glue injection hole of the glue injection ring on the other side of the reinforced concrete member, and cleaning the surface of the reinforced concrete member after the glue injection is finished.
(8) And (3) maintaining, namely placing the reinforced concrete member after reinforcement in dry air, standing for 48 hours at normal temperature, and after the bar planting glue is hardened, jointly stressing the reinforced steel plate and the reinforced concrete member.
Wherein, the step (1) comprises the following steps:
firstly, determining the straight shear bearing capacity of the unreinforced reinforced concrete member according to the following formula;
VRC＝0.097Acvfc+0.752Avffy
wherein, VRCReinforced concrete structure without reinforced surfaceBearing capacity (N), A) of a straight shearcvRepresents the cross-sectional area (mm) of the concrete at the straight shear plane2)，AvfRepresents the cross-sectional area (mm) of the direct-shear steel bar at the direct-shear plane2)，fcRepresents the compressive strength (MPa) of concrete; f. ofyRepresents the yield strength (MPa) of the steel bar;
secondly, a determination formula of the sectional area Ap of the steel plate is as follows:
Ap＝(VERC-VRC)/(1.083σp+τp)
wherein, VERCShows the direct shear bearing capacity (N, V) of the reinforced concrete memberRCRepresenting the straight shear bearing capacity (N), σ, of the unreinforced reinforced concrete memberpRepresents a transverse tensile stress (MPa) of the steel sheet; tau ispRepresents a vertical shear stress (MPa) of the steel sheet;
transverse tensile stress sigma of the steel platepAnd the vertical shear stress tau of the steel platepRespectively as follows:
σp＝Epεp＝Ep(108+28.6ρ+12.9λ)，
τp＝Gpγp＝Gp(306+94.1ρ-34.4λ)，
wherein E ispRepresents the modulus of elasticity (MPa), G, of the steel sheetpRepresents the shear modulus (MPa), ε of the steel sheetpRepresents the effective transverse tensile strain, gamma, of the steel sheetpThe effective vertical shear strain of the steel plate is shown, rho represents the reinforcement ratio of the direct-shear reinforcing steel bar at the direct-shear surface, and lambda is ApA represents the steel plate reinforcement ratio, and A represents the area of the direct shear plane (mm)2)；
The determination formula of the thickness w of the steel plate is as follows:
w＝Ap/l
wherein l is a straight shear plane length (mm).
Examples
As shown in fig. 2, 3 and 4, a Z-shaped test piece is used, and a steel plate is anchored to the surface of a reinforced concrete member by a reinforcing bolt. The length of the straight shearing surface of the component is 320mm, the width of the component is 210mm, and the straight shearing reinforcement rate is 0.46-1.2%. The thickness of the steel plate is 6mm and 8mm, and the reinforcement rate of the steel plate is 3.57-5.95%. The distance between the anchoring position of the bolt and the straight shear plane is 100mm, and the distance between the bolts is 60 mm. And (4) obtaining the straight shear bearing capacity of the reinforced concrete member before and after reinforcement through tests. Table 1 shows the reinforcing effect of anchoring steel plates by reinforcing bolts to reinforce the straight shearing force of reinforced concrete and compares it with the existing method.
TABLE 1
As can be seen from Table 1, the steel plates are anchored on the surface of the reinforced concrete member through the reinforcing bolts so as to effectively improve the direct shear performance of the reinforced concrete member, and the direct shear bearing capacity of the member with the reinforcement ratio of 0.46-1.20% is improved by 25-57%; compared with the horizontal pasting CFRP method, the method adopted by the invention has more obvious reinforcing effect, and good reinforcing effect is obtained under the condition of high reinforcement rate; compared with the method of obliquely pasting the CFRP, the method has the advantages that the reinforcing effect is equivalent to that under the optimal angle, and the construction requirement of wrapping concrete on four sides of the CFRP when the CFRP is obliquely pasted is avoided. Compared with the existing reinforcing method, the method of the invention has the characteristics of good reinforcing effect, good integrity of bonded steel and original structure, no easy damage of steel plate, low cost and the like.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. It will be readily apparent to those skilled in the art that various modifications to these embodiments may be made, and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications within the scope of the present invention based on the disclosure of the present invention.
Claims (7)
1. A method for improving the direct shear bearing capacity of a reinforced concrete member is characterized by comprising the following steps: fixing a steel plate on the surface of a pre-reinforced straight shear surface part of a reinforced concrete member to improve the straight shear bearing capacity of the reinforced concrete member, wherein the sectional area of the steel plate is determined according to the straight shear bearing capacity of the unreinforced reinforced concrete member and the straight shear bearing capacity which needs to be achieved by the reinforced concrete member, and the thickness of the steel plate is determined according to the sectional area of the steel plate and the length of the straight shear surface;
the sectional area Ap of the steel plate is determined by the following formula:
Ap＝(VERC-VRC)/(1.083σp+τp)
wherein, VERCShowing the straight shear bearing capacity, V, to be achieved by the reinforced concrete memberRCRepresenting the straight shear bearing capacity, sigma, of an unreinforced reinforced concrete memberpRepresenting the transverse tensile stress of the steel plate; tau ispRepresenting the vertical shear stress of the steel plate;
the unreinforced reinforced concrete member has a straight shear bearing capacity VRCThe determination formula of (1) is as follows:
VRC＝0.097Acvfc+0.752Avffy，
wherein, VRCShowing the straight shear bearing capacity of the unreinforced reinforced concrete member, AcvDenotes the cross-sectional area of the concrete at the straight shear plane, AvfShowing the cross-sectional area, f, of the bar at the straight shear planecThe concrete compressive strength is represented; f. ofyIndicates the yield strength of the steel bar;
transverse tensile stress sigma of the steel platepAnd the vertical shear stress tau of the steel platepRespectively as follows:
σp＝Epεp＝Ep(108+28.6ρ+12.9λ)，
τp＝Gpγp＝Gp(306+94.1ρ-34.4λ)，
wherein E ispRepresents the modulus of elasticity (MPa), G, of the steel sheetpDenotes the shear modulus, ε, of the steel sheetpRepresents the effective transverse tensile strain, gamma, of the steel sheetpRepresenting the effective vertical shear strain of the steel sheet,rho represents the reinforcement ratio of the direct-shear reinforcing steel bar at the direct-shear plane, and lambda is ApThe A represents the steel plate reinforcement rate, and the A represents the area of a direct shear surface;
the determination formula of the thickness w of the steel plate is as follows:
w＝Ap/l
wherein l represents the straight shear plane length.
2. The method of claim 1, wherein: the steel plates are fixed on the direct shear surface of the reinforced concrete member through reinforcing bolts, and the number of the reinforcing bolts is more than two.
3. The method of claim 2, wherein: the number of the steel plates is two, and the reinforcing bolts penetrate through the reinforced concrete member to fix the two steel plates on two sides of the reinforced concrete member.
4. The method of claim 2, wherein: the reinforcing bolts are arranged at the positions, 80-200 mm away from the straight shearing surface, of the two sides of the straight shearing surface, and the distance between every two reinforcing bolts is 50-100 mm.
5. The method of claim 4, wherein: the reinforcing bolts are arranged at the positions 100mm away from the straight shearing surface on the two sides of the straight shearing surface; and/or the spacing between each reinforcement bolt is 60 mm.
6. A method according to claim 2 or 3, characterized by: and the contact surface of the reinforcing bolt and the reinforced concrete member is filled with bar planting glue.
7. The method of claim 6, wherein: and placing the reinforced concrete member reinforced by the steel plate in dry air, standing for 24-36 hours at normal temperature, and after the bar-planting glue is hardened, jointly bearing the force on the steel plate and the reinforced concrete member.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153594A (en) * | 2014-08-04 | 2014-11-19 | 同济大学 | Method for improving straight shear bearing force of reinforced concrete member |
| CN105756365A (en) * | 2016-03-22 | 2016-07-13 | 武汉大学 | Method for accelerating reinforcement of concrete beam |
| CN106567555A (en) * | 2016-10-31 | 2017-04-19 | 同济大学 | Method for improving direct shear bearing capacity of reinforced concrete component by obliquely attaching fiber composite material to surface of reinforced concrete component |
| CN108005259A (en) * | 2017-11-13 | 2018-05-08 | 杭萧钢构股份有限公司 | A kind of steel plate combined shear wall splices node |
| CN108265855A (en) * | 2017-11-23 | 2018-07-10 | 同济大学 | Reinforced concrete shear wall and its frame with anchor steel Shear Strengthening |
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2018
- 2018-07-25 CN CN201810829145.0A patent/CN109138475B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104153594A (en) * | 2014-08-04 | 2014-11-19 | 同济大学 | Method for improving straight shear bearing force of reinforced concrete member |
| CN105756365A (en) * | 2016-03-22 | 2016-07-13 | 武汉大学 | Method for accelerating reinforcement of concrete beam |
| CN106567555A (en) * | 2016-10-31 | 2017-04-19 | 同济大学 | Method for improving direct shear bearing capacity of reinforced concrete component by obliquely attaching fiber composite material to surface of reinforced concrete component |
| CN108005259A (en) * | 2017-11-13 | 2018-05-08 | 杭萧钢构股份有限公司 | A kind of steel plate combined shear wall splices node |
| CN108265855A (en) * | 2017-11-23 | 2018-07-10 | 同济大学 | Reinforced concrete shear wall and its frame with anchor steel Shear Strengthening |
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