CN112196123A - FRP (fiber reinforced plastic) section-steel section groove tooth cementing connection node and construction method - Google Patents
FRP (fiber reinforced plastic) section-steel section groove tooth cementing connection node and construction method Download PDFInfo
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- CN112196123A CN112196123A CN202011036593.9A CN202011036593A CN112196123A CN 112196123 A CN112196123 A CN 112196123A CN 202011036593 A CN202011036593 A CN 202011036593A CN 112196123 A CN112196123 A CN 112196123A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
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Abstract
The invention discloses an FRP profile-steel profile groove tooth cemented connection node and a construction method, comprising an FRP profile, a steel profile and an adhesive; the steel section bar is provided with a groove along the length direction, a protrusion is arranged in the groove on the steel section bar, a long protrusion corresponding to the groove on the steel section bar is arranged on the FRP section bar, the long protrusion on the FRP section bar comprises a basic protrusion and a large protrusion, the steel section bar and the FRP section bar are horizontally lapped, the position and the size of the basic protrusion and the large protrusion need to be calculated and determined through the size of the groove on the steel section bar and the thickness of an adhesive layer, the long protrusion on the FRP section bar is embedded into the groove of the steel section bar, and an adhesive is filled between the FRP section bar and the steel section bar. The FRP profile-steel profile groove tooth cemented joint improves the joint connection efficiency, solves the bottleneck problem of the FRP profile connection node, is simple to construct, and can be applied to newly-built FRP profile structures and existing steel structure reinforcement.
Description
Technical Field
The invention relates to the technical field of civil engineering traffic structures, in particular to an FRP (fiber reinforced plastic) section-steel section groove tooth cementing connection node and a construction method.
Background
The FRP section is a novel high-performance composite material formed by mixing continuous fibers and a resin matrix according to a certain proportion and performing a certain molding process. The fiber is the stressed main body of the FRP section, the resin matrix has the function of linking fiber tows to form an organic whole, and the macroscopic mechanical property of the FRP is determined by the properties of the fiber and the resin in cooperation with the stress. The FRP section has the characteristics of high specific strength and specific rigidity, good fatigue resistance and durability, strong designability and the like. At present, the FRP profiles applied to the civil engineering field are almost produced by adopting a pultrusion process, and the connecting nodes of the FRP profiles are one of the main bottlenecks of the application of the FRP profiles in the civil engineering field.
At present, the connecting node of the FRP profile and the steel profile mainly comprises a bolt node and a cementing node: the FRP section and the bolt joint of the steel section are mostly made of steel bolts, the shear strength of the FRP section is far lower than that of steel, so that the failure modes of the joint are all that the FRP section is sheared and damaged, and the joint connection efficiency is lower (lower than 30%) because the connection mode needs to drill holes in the FRP section, so that the bolt joint of the FRP section and the steel section cannot be adopted in the connection of main stress members. The FRP section and the steel section are connected by the cementing connection node of the FRP section and the steel section by adopting an adhesive, the connection mode can not damage the connection parent metal, the damage mode is mostly the peeling damage of the FRP section or the steel section, and the essence of the damage is that the shearing force generated by external force in the node exceeds the shearing strength of the node. Therefore, a glued joint of FRP section and steel section with higher joint connection efficiency is needed to solve the above problems.
Disclosure of Invention
The invention aims to overcome the main bottleneck problem that FRP section bar connecting nodes limit the popularization and application of FRP section bars, and provides an FRP section bar-steel section bar groove tooth cementing connecting node and a construction method.
The technical scheme adopted by the invention is as follows: an FRP profile-steel profile groove tooth cemented connection node comprises an FRP profile, a steel profile and an adhesive;
the steel section bar is provided with a groove along the length direction, a protrusion is arranged in the groove on the steel section bar, a long protrusion corresponding to the groove on the steel section bar is arranged on the FRP section bar, the long protrusion on the FRP section bar comprises a basic protrusion and a large protrusion, the steel section bar and the FRP section bar are horizontally lapped, the position and the size of the basic protrusion and the large protrusion need to be calculated and determined through the size of the groove on the steel section bar and the thickness of an adhesive layer, the long protrusion on the FRP section bar is embedded into the groove of the steel section bar, and an adhesive is filled between the FRP section bar and the steel section bar.
Preferably, the space between the grooves on the steel section is 20-25% of the section width of the steel section, and the number of the grooves is not less than 3.
Preferably, the direction of the groove on the steel section bar is parallel to the length direction of the steel section bar, namely parallel to the stress direction of the node; the length of the groove in the length direction of the steel section is equal to the length of a joint of the FRP section and the steel section, and the specific length is determined through calculation. The groove direction can also be adjusted according to the stress direction of the node, and a certain included angle is formed between the groove direction and the length direction of the steel section, and the included angle is smaller than 45 degrees.
Preferably, the depth of the groove on the steel section is 25% -45% of the thickness of the steel section, the width of the groove is 20% -40% of the thickness of the steel section, and the specific depth and width parameters of the groove can be determined through calculation.
Preferably, the height of the protrusions in the grooves on the steel section is 30% -50% of the depth of the grooves, the width of the protrusions is 30% -50% of the depth of the grooves, and the number of the protrusions is not less than 6.
Preferably, the width of the strip protrusion on the FRP profile is smaller than the width of the groove on the steel profile and is not smaller than 80% of the width of the groove on the steel profile.
Preferably, the thickness of the adhesive layer of the adhesive between the FRP profile and the steel profile is not less than 15% of the thickness of the steel profile or 15% of the thickness of the FRP profile, the thickness of the adhesive layer of the adhesive in the groove of the steel profile is not less than 10% of the thickness of the steel profile or 15% of the thickness of the FRP profile, and the thicknesses of the two adhesive layers are not less than 1.5 mm.
Preferably, the thickness of the FRP section and the thickness of the steel section are not less than 10mm, and the tensile strength of the FRP section is more than 1.5 times of that of the steel section.
The construction method of the FRP profile-steel profile groove tooth cemented joint comprises the following steps:
step 1: and calculating and determining the length of the connecting node, the direction and the length of the groove on the steel section according to the type (Q234, Q345 and the like) and the strength of the steel, the type (BRFP, CFRP, GRFP and the like) and the strength of the FRP section, the stress magnitude and the stress direction of the connecting node and the like.
Step 2: according to the width of the section of the steel section and the thickness of the steel section, calculating and determining the distance, the width and the depth of the groove on the steel section, the width, the height, the distance and the like of the protrusion in the groove, and processing the steel section, wherein the grooving mode of the steel section is divided into two types: for the newly-built structure, cutting in a linear cutting mode; for the reinforced structure, a cutting machine is adopted for cutting, and the groove on the steel section needs to be cleaned after the groove is processed.
And step 3: and determining parameters of the long strip bulges on the FRP profiles according to the parameters of the grooves on the steel profiles, and processing and manufacturing the FRP profiles, wherein the processing of the FRP profiles adopts a pultrusion process, and the long strip bulges and the profiles are integrally processed.
And 4, step 4: according to the selected adhesive and the adhesive layer thickness of the adhesive, the adhesive is uniformly coated on the surface of the steel section, small steel balls with corresponding diameters are placed on the steel section according to the adhesive layer thickness value to control the adhesive layer thickness, then the FRP section is correspondingly placed on the steel section, the gap and air between the FRP section and the steel section are eliminated by applying pretightening force through the device, and the tight adhesion of the FRP section and the steel section is ensured.
And 5: and (5) maintaining the adhesive, and removing the pre-tightening force device between the FRP profile and the steel profile when the strength of the adhesive meets the requirement to complete the construction of the FRP profile-steel profile groove tooth cemented joint.
Has the advantages that: the FRP profile-steel profile groove tooth cemented connection node and the construction method have the following beneficial effects: the steel section is provided with the groove, the protrusion is arranged in the groove of the steel section, the FRP section is provided with the strip protrusion corresponding to the groove of the steel section, and the shearing resistance bearing capacity of the FRP section-steel section cementing connection node can be improved. The problem of the FRP section bar shear damage when FRP section bar and steel section bar adopt the bolt node, and the FRP section bar peel off the destruction of steel section bar that appears when FRP section bar and the cementitious bond node of steel section bar adopt the adhesive to connect is solved. The FRP profile-steel profile groove tooth cemented joint improves the joint connection efficiency, solves the bottleneck problem of the FRP profile connection node, is simple to construct, and can be applied to newly-built FRP profile structures and existing steel structure reinforcement.
Drawings
FIG. 1 is a plan view of a steel profile slot;
FIG. 2 is a plan view of a protrusion on the FRP profile;
FIG. 3 is a plan view of a FRP profile-steel profile groove tooth cemented joint node;
FIG. 4 is a plan view of a steel section with a chute;
3 FIG. 3 5 3 is 3 a 3 sectional 3 view 3 of 3 the 3 groove 3 on 3 the 3 steel 3 profile 3 ( 3 FIG. 3 A 3- 3 A 3) 3; 3
FIG. 6 is a cross-sectional view of a protruded strip of the FRP profile (FIG. B-B);
FIG. 7 is a sectional view of a FRP profile-steel profile slot tooth glued joint node (FIG. C-C);
FIG. 8 is a sectional view of a groove formed in a steel profile;
FIG. 9 is a cross-sectional view of a protruded strip of FRP section;
FIG. 10 is a sectional view of a FRP profile-steel profile groove tooth cemented joint node;
in the figure: 1-steel section bar, 2-groove, 3-bulge, 4-steel section bar length direction, 5-FRP section bar, 6-strip bulge, 7-big bulge, 8-basic bulge, 10-adhesive, 13-adhesive, 14-adhesive, 15-included angle.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1-3 and fig. 5-7, the FRP profile-steel profile slot tooth cemented joint of the present invention comprises an FRP profile 5, a steel profile 1 and an adhesive 10; a groove 2 is processed on the steel section bar 1 along the length direction 4 of the steel section bar, and a bulge 3 is arranged in the groove 2 on the steel section bar. The FRP profile 5 is provided with a strip protrusion 6 corresponding to the groove in the steel profile, the strip protrusion 6 on the FRP profile 5 comprises a basic protrusion 8 and a large protrusion 7, the steel profile 1 and the FRP profile 5 are horizontally lapped, the strip protrusion 6 on the FRP profile 5 is embedded into the groove 2 of the steel profile 1, and an adhesive 10 is filled between the FRP profile 5 and the steel profile 1.
As shown in fig. 4, when the stress direction of the joint of the steel profile 1 and the FRP profile 5 is not consistent with the length direction 4 of the steel profile, the direction of the groove 2 on the steel profile 1 may form a certain included angle 15 with the length direction 4 of the steel profile, the included angle is not greater than 45 degrees, and the oblique groove distance W5 on the steel profile is 1.1 to 1.4 times the value of the vertical groove distance W2 on the steel profile.
As shown in fig. 1-4 and fig. 8-10, the length L1 of the groove on the steel profile 1 along the length direction 4 of the steel profile is equal to the length of the joint of the FRP profile 5 and the steel profile 1, and the specific length L1 of the groove is determined by calculation. The distance W3 between the grooves on the steel plate is 20-25% of the section width W1 of the steel section, and the number of the grooves is not less than 3.
The depth H5 of the groove on the steel section is 25-45% of the thickness H4 of the steel section, the width W2 of the groove is 20-40% of the thickness H4 of the steel section, and the specific depth H5 and the specific width W2 of the groove can be determined by calculation.
The protrusions 3 are arranged in the grooves 2 on the steel section bar 1, the height H6 of the protrusions 3 in the grooves 2 is 30% -50% of the groove depth, the width T3 of the protrusions 3 is 30% -50% of the groove depth, and the number of the protrusions 3 is not less than 6.
The FRP section 5 is provided with a strip protrusion 6, and the width W4 of the protrusion 6 is less than the width W2 of the groove 2 on the steel plate 1 and not less than 80% of the width W2 of the groove on the steel plate 1.
The long strip bulges 6 arranged on the FRP section bar comprise basic bulges 8 and large bulges 7, and the positions and the sizes of the basic bulges 8 and the large bulges 7 comprise: the distance T1 between the big bulges on the FRP section, the width T2 between the big bulges on the FRP section, the maximum height H2 of the bulges on the FRP section and the height H3 of the big bulges on the FRP section are determined by calculation through the size of the groove 2 on the steel plate 1 and the thickness of the glue layer.
The thickness of the adhesive 13 between the FRP profile 5 and the steel profile 1 is not less than 15% of the thickness of the steel profile or 15% of the thickness of the FRP profile, the thickness of the adhesive 14 in the groove 2 of the steel profile 1 is not less than 10% of the thickness of the steel profile or 10% of the thickness of the FRP profile, and the thicknesses of the two adhesive layers are not less than 1.5 mm.
Wherein, the thickness H1 of FRP section 5 and the thickness H4 of steel section 1 are not less than 10mm, and the tensile strength of FRP section 5 is more than 1.5 times of the tensile strength of steel section 1.
The specific embodiment also discloses a construction method of the FRP profile-steel profile groove tooth cemented joint, which comprises the following steps:
step 1: the length L1 of the connecting node, the direction and length of the groove 2 on the steel plate 1 and the like are calculated and determined according to the type (Q234, Q345 and the like) and the strength of the steel section 1, the type (BRFP, CFRP, GRFP and the like) and the strength of the FRP section 5, the stress magnitude and direction of the connecting node and the like.
Step 2: according to the width W1 and the thickness H4 of the section of the steel section, the distance W3, the width W2, the depth H5 of the grooves on the steel section, the width T3, the height H6 and the distance T4 of the protrusions in the grooves and the like are calculated and determined, the steel section 1 is machined, and the grooving mode of the steel section 1 is divided into two modes: for the newly-built structure, cutting in a linear cutting mode; for the reinforced structure, a cutting machine is adopted for cutting, and the groove 2 on the steel plate needs to be cleaned after being processed.
And step 3: according to the parameters of the groove on the steel section, determining the parameters of the protrusion 6 of the long strip on the FRP section 5, comprising the following steps: the FRP section bar processing method comprises the steps of enabling the width W4 of long strip bulges on the FRP section bar, enabling the distance T1 between large bulges on the FRP section bar, enabling the width T2 between the large bulges on the FRP section bar, enabling the maximum height H2 of the bulges on the FRP section bar and the height H3 of the large bulges on the FRP section bar to be processed and manufactured, enabling the FRP section bar 5 to be processed through a pultrusion process, and enabling the long strip bulges 6 and the FRP section bar 5 to be integrally processed.
And 4, step 4: according to the selected adhesive 10 and the adhesive layer thickness, the adhesive 10 is uniformly coated on the surface of the steel section 1, according to the adhesive layer thickness value, small steel balls with corresponding diameters are placed on the steel section to control the adhesive layer thickness, then the FRP section 5 is correspondingly placed on the steel section 1, the gap and air between the FRP section 5 and the steel section 1 are eliminated by applying pretightening force through the device, and the tight fit of the FRP section 5 and the steel section 1 is ensured.
And 5: and (5) maintaining the adhesive 10, and when the strength of the adhesive 10 meets the requirement, removing the pre-tightening force device between the FRP profile 5 and the steel profile 1 to complete the construction of the FRP profile-steel profile groove tooth cemented joint.
The embodiments of the present invention are described in detail above with reference to the drawings, but the present invention is not limited to the described embodiments. It will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in the embodiments without departing from the spirit and scope of the invention.
Claims (9)
1. The utility model provides a FRP section bar-steel section bar groove tooth cement joint node which characterized in that: comprises FRP section bars, steel section bars and adhesive;
the FRP profile is characterized in that a groove is formed in the steel profile along the length direction, a protrusion is arranged in the groove in the steel profile, a long protrusion corresponding to the groove in the steel profile is arranged on the FRP profile and comprises a basic protrusion and a large protrusion, the steel profile and the FRP profile are horizontally lapped, the long protrusion on the FRP profile is embedded into the groove in the steel profile, and an adhesive is filled between the FRP profile and the steel profile.
2. The FRP profile-steel profile slot tooth glued joint node of claim 1, characterized in that: the space between the grooves on the steel section is 20-25% of the section width of the steel section, and the number of the grooves is not less than 3.
3. The FRP profile-steel profile slot tooth glued joint node of claim 1, characterized in that: the direction of the groove on the steel section bar is parallel to the length direction of the steel section bar, namely parallel to the stress direction of the node; the length of the groove on the steel section along the length direction of the steel section is equal to the length of a connecting node of the FRP section and the steel section; or the direction of the groove on the steel section and the length direction of the steel section form an included angle, and the included angle is smaller than 45 degrees.
4. The FRP profile-steel profile slot tooth glued joint node of claim 1, characterized in that: the depth of the groove on the steel section is 25% -45% of the thickness of the steel section, and the width of the groove is 20% -40% of the thickness of the steel section.
5. The FRP profile-steel profile slot tooth glued joint node of claim 1, characterized in that: the height of the protrusions in the grooves on the steel section is 30% -50% of the depth of the grooves, the width of the protrusions is 30% -50% of the depth of the grooves, and the number of the protrusions is not less than 6.
6. The FRP profile-steel profile slot tooth glued joint node of claim 1, characterized in that: the width of the long strip protrusion on the FRP profile is smaller than the width of the groove on the steel profile and is not smaller than 80% of the width of the groove on the steel profile.
7. The FRP profile-steel profile slot tooth glued joint node of claim 1, characterized in that: the thickness of the adhesive layer of the adhesive between the FRP profile and the steel profile is not less than 15% of the thickness of the steel profile or 15% of the thickness of the FRP profile, the thickness of the adhesive layer of the adhesive in the groove of the steel profile is not less than 10% of the thickness of the steel profile or 15% of the thickness of the FRP profile, and the thickness of the adhesive layers at two positions is not less than 1.5 mm.
8. The FRP profile-steel profile slot tooth glued joint node of claim 1, characterized in that: the thickness of the FRP section and the thickness of the steel section are not less than 10mm, and the tensile strength of the FRP section is more than 1.5 times of that of the steel section.
9. The FRP profile-steel profile slot tooth glued joint construction method according to the claim 1, 2, 3, 4, 5, 6, 7 or 8, comprising the following steps:
step 1: calculating and determining the length of the connection node and the direction and the length of the groove on the steel section according to the type and the strength of the steel, the type and the strength of the FRP section, the stress magnitude and the stress direction of the connection node and the like;
step 2: according to the width of the section of the steel section and the thickness of the steel section, calculating and determining the distance, the width and the depth of the groove on the steel section and the width, the height and the distance of the protrusion in the groove, and processing the steel section, wherein the grooving mode of the steel section is divided into two types: for the newly-built structure, cutting in a linear cutting mode; for the reinforced structure, a cutting machine is adopted for cutting, and the groove on the steel section needs to be cleaned after the groove is processed;
and step 3: determining parameters of a long strip protrusion on the FRP profile according to parameters of a groove on the steel profile, and processing and manufacturing the FRP profile, wherein the processing of the FRP profile adopts a pultrusion process, and the long strip protrusion and the profile are integrally processed;
and 4, step 4: uniformly coating the adhesive on the surface of the steel section according to the selected adhesive and the adhesive layer thickness of the adhesive, placing small steel balls with corresponding diameters on the steel section according to the adhesive layer thickness value to control the adhesive layer thickness, then correspondingly placing the FRP section on the steel section, applying pretightening force through a device to remove a gap and air between the FRP section and the steel section and ensure that the FRP section and the steel section are tightly attached;
and 5: and (5) maintaining the adhesive, and removing the pre-tightening force device between the FRP profile and the steel profile when the strength of the adhesive meets the requirement to complete the construction of the FRP profile-steel profile groove tooth cemented joint.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011036593.9A CN112196123A (en) | 2020-09-27 | 2020-09-27 | FRP (fiber reinforced plastic) section-steel section groove tooth cementing connection node and construction method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011036593.9A CN112196123A (en) | 2020-09-27 | 2020-09-27 | FRP (fiber reinforced plastic) section-steel section groove tooth cementing connection node and construction method |
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| CN112196123A true CN112196123A (en) | 2021-01-08 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112900190A (en) * | 2021-01-19 | 2021-06-04 | 南京工业大学 | FRP (fiber reinforced Plastic) reinforced wood-plastic plank road plate and preparation method thereof |
| CN114295354A (en) * | 2021-12-28 | 2022-04-08 | 南京工程学院 | Axial loading anchorage device and loading method for L-shaped section component |
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| CN205836133U (en) * | 2016-08-01 | 2016-12-28 | 上海佰顿新材料科技有限公司 | A kind of elevator decoration composite metal plate |
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| CN111070725A (en) * | 2019-12-11 | 2020-04-28 | 江苏理工学院 | Preparation method of mortise-tenon-connected carbon fiber composite material laminated plate |
| EP3650207A1 (en) * | 2018-11-09 | 2020-05-13 | C.R.F. Società Consortile per Azioni | Method for obtaining a joint between elements of different materials |
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| CN101895047A (en) * | 2010-06-29 | 2010-11-24 | 攀钢集团冶金工程技术有限公司 | Method for connecting bus |
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| EP3650207A1 (en) * | 2018-11-09 | 2020-05-13 | C.R.F. Società Consortile per Azioni | Method for obtaining a joint between elements of different materials |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112900190A (en) * | 2021-01-19 | 2021-06-04 | 南京工业大学 | FRP (fiber reinforced Plastic) reinforced wood-plastic plank road plate and preparation method thereof |
| CN114295354A (en) * | 2021-12-28 | 2022-04-08 | 南京工程学院 | Axial loading anchorage device and loading method for L-shaped section component |
| CN114295354B (en) * | 2021-12-28 | 2023-12-01 | 南京工程学院 | Axle center loading anchor for L-shaped section member and loading method |
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Application publication date: 20210108 |