CN109736200B - Steel-UHPC sheet combination structure system for quickly assembling steel plate support-cluster inclined nail - Google Patents
Steel-UHPC sheet combination structure system for quickly assembling steel plate support-cluster inclined nail Download PDFInfo
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- CN109736200B CN109736200B CN201811496216.6A CN201811496216A CN109736200B CN 109736200 B CN109736200 B CN 109736200B CN 201811496216 A CN201811496216 A CN 201811496216A CN 109736200 B CN109736200 B CN 109736200B
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Abstract
The invention discloses a steel-UHPC sheet combined structure system for quickly assembling a steel plate support and a cluster inclined nail, which comprises a steel beam, an UHPC sheet, a steel plate support and short nails, wherein the steel plate support is in an isosceles trapezoid structure, the steel plate support is provided with a connecting hole, a high-strength friction type bolt penetrates through the connecting hole to be connected with the steel beam, the short nails are vertically arranged on inclined planes at two sides of the steel plate support and front and rear end surfaces, the UHPC sheet is arranged above the steel beam, and the combined body of the steel plate support and the short nails is uniformly distributed in the UHPC sheet. The steel plate bracket is connected with the steel beam at the interface through cluster type inclined nails containing the steel plate bracket to form a combined structure system, the rigid connection of the steel plate bracket is utilized to reduce the interface slippage in the normal use stage, and the flexible connecting piece characteristic of the stud is adopted to make up the defect of insufficient ductility of the steel plate bracket as the rigid connecting piece in the limit state. Furthermore, laterally arranged studs may enhance the shear resistance of the steel-UHPC interface.
Description
Technical Field
The invention belongs to the field of composite structures in the field of civil engineering, and particularly relates to a steel-UHPC (ultra high performance polycarbonate) sheet composite structure system for quickly assembling a steel plate support-cluster inclined nail.
Background
The traditional steel-concrete composite structure mainly enables a steel beam and a common concrete bridge deck to form a combined section to bear force together through shear connectors such as studs. For steel bridge structure system, the composite structure bridge can reduce structure cost, and for concrete bridge, the composite structure bridge can effectively reduce the structure dead weight again. Therefore, the structural system gives full play to the advantages of the steel structure and the concrete structure in the aspects of construction performance and mechanical property, and has good economical efficiency. However, the study of scholars at home and abroad shows that: the common steel-concrete composite bridge structure limits the spanning capability of the structure due to the self weight of the concrete bridge deck. And the greater dead weight of the superstructure will result in higher construction costs for the substructure, further restricting the applicability of the composite structure. Meanwhile, the common concrete bridge deck has the problems of easy cracking and the like due to the low tensile strength and other characteristics of the common concrete, and the durability of the structure is influenced.
In order to solve the problem that the common concrete bridge deck is easy to crack, the most widely applied technical means in the engineering at present is to apply a certain compressive stress reserve by adopting a prestress technology, although the measures can limit the cracking problem and the like to a certain extent, the measures increase the construction cost and difficulty, and the shrinkage creep of the concrete easily causes part of prestress loss.
Aiming at the problems of large dead weight of a bridge deck of a common steel-concrete composite structure bridge and the like, the dead weight of the structure is mainly reduced by adopting a hollow section or applying a certain horizontal prestress and the like in the prior engineering. Although these measures can reduce the dead weight of the structure to a certain extent, they also make the construction process complicated and inconvenient to implement.
Disclosure of Invention
In order to solve the problems, the invention discloses a steel-UHPC thin plate combined structure system for quickly assembling steel plate support-cluster inclined nails. The plate thickness of a pressed area is reduced by mainly utilizing the higher compressive strength of UHPC (ultra high performance concrete), thereby achieving the purpose of reducing the self weight of the structure. Meanwhile, the UHPC is provided with the hybrid fiber, so that the tensile strength of the UHPC can be greatly improved, and the effect of preventing the UHPC bridge deck from cracking is achieved. In interface connection, a combined shear connection technology is formed by combining the large-diameter short nail and the steel plate support, so that the steel plate support and the stud connecting piece respectively play a main role in a normal use stage and a limit state, and a new combined structure system with controllable rigidity and flexibility in different stages is formed. The ultimate bearing capacity of the combined structure is improved, and the defect of insufficient ductility of the rigid connecting piece is overcome.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a steel-UHPC sheet combined structure system for quickly assembling a steel plate support and a cluster inclined nail comprises a steel beam, an UHPC sheet, a steel plate support and short nails, wherein the steel plate support is of an isosceles trapezoid structure, a connecting hole is formed in the steel plate support, a high-strength friction type bolt penetrates through the connecting hole to be connected with the steel beam, the short nails are vertically arranged on inclined planes at two sides of the steel plate support and on the front end face and the rear end face, the UHPC sheet is arranged above the steel beam, and combined bodies of the steel plate support and the short nails are uniformly distributed in the UHPC sheet.
Furthermore, the short pins adopt large-diameter pins with the diameter of 30mm, and the pin height of the large-diameter pins is adapted to the thickness of the UHPC plate.
Furthermore, the short nails on the inclined planes at the two sides of the steel plate support are the same as the short nails on the front end surface and the rear end surface in size and shape.
Further, the length of the bevel edge of the steel plate bracket is determined according to the diameter of the stud and the inclination angle of the bevel edge, the length of the longitudinal welding seam of the steel plate is determined according to the length of the bevel edge and the inclination angle, and the optimal angle of the bevel edge of the steel plate bracket is controlled to be between 30 and 60 degrees.
Furthermore, the UHPC thin plate needs to be manufactured by UHPC mixed with mixed fibers, and mainly adopts 1% of straight steel fibers and 1% of end hook fibers by volume.
Further, the UHPC thin plate with the thickness of 50-80mm is determined according to the thickness of the steel plate support, the pin inclination angle and the pin height.
Has the advantages that: compared with the prior art, the invention has the following advantages:
1. the short nails with the diameter of 30mm are adopted for connection at the interface and are welded on the bevel edge and the front and rear end faces of the steel plate support, so that the shear strength of the interface between the oblique stud and the plate support is increased, and the connection integrity of the stud and the steel plate support is improved.
2. The invention comprehensively utilizes the advantages of the steel plate support and the large-diameter short nail as the shear connector. In the normal use stage, the steel plate is mainly used as the characteristic of the rigid interface connecting piece, so that the interface slippage is reduced, and in the later stage of the load action, the flexible shear-resistant characteristic of the stud and the high-strength bolt generates larger deformation, so that the ductility requirement of the structure in the limit state is met.
3. The UHPC thin plate has higher tensile strength due to the mixed fiber, can improve the crack resistance of a hogging moment region, and has higher compactness and narrow and dense crack distribution characteristic, thereby being beneficial to improving the durability of the structure.
4. The combined structure system can control the inclination angle of the oblique stud by adjusting the inclination angle of the steel plate support, so that the lateral stiffness of the stud is changed, and the requirement of extreme state slippage performance is met.
5. The structure system improves the shear rigidity of the interface through rigid connection of the plate support, the rigidity characteristic of the structure system is adapted to the high pressure resistance characteristic of UHPC, and the advantage of high rigidity can be fully exerted. In addition, in a limit state, the stud or the bolt is damaged before the steel plate support, so that the interface connection efficiency is ensured, and meanwhile, the ductility level of the structure is improved by utilizing the characteristic of stronger connection deformability of the bolt.
6. The lateral (front and rear end) studs of the structural system can assist the steel plate support to participate in stress, enhance the lateral constraint effect of the steel plate support and improve the shear resistance of an interface.
7. The lateral and oblique studs in the structural system can form a space truss web member system of the UHPC thin plate, and can increase the lateral rigidity of the UHPC thin plate, so that the overall rigidity of a combined section is enhanced.
8. The steel plate support-cluster type inclined nail combined shear part in the structural system is connected through the high-strength friction type bolt instead of welding, so that the replacement is convenient, and the rapid construction process of the on-site bridge is greatly accelerated.
Drawings
FIG. 1 is a schematic view of the steel-UHPC sheet composite structural system and interface connector configuration of the present invention;
FIG. 2 is a longitudinal cross-sectional view of the composite structural system of the present invention;
FIG. 3 is a cross-sectional view of the composite structural system of the present invention.
List of reference numerals:
the steel plate shear comprises a steel beam 1, a UHPC thin plate 2, a high-strength friction type bolt 3, a combined type shear part 4, a steel plate support 5, oblique short nails 6, short nails 7 on the front end face and the rear end face, connecting holes 8, a steel beam preformed hole 9, a screw rod 10, a nut 11 and a gasket 12.
Detailed Description
The present invention will be further illustrated with reference to the accompanying drawings and specific embodiments, which are to be understood as merely illustrative of the invention and not as limiting the scope of the invention. It should be noted that the terms "front," "back," "left," "right," "upper" and "lower" used in the following description refer to directions in the drawings, and the terms "inner" and "outer" refer to directions toward and away from, respectively, the geometric center of a particular component.
Example (b):
the invention relates to a high-performance steel-UHPC thin plate combined structure system and an interface connection technology adapted to the same. The structure system mainly comprises a UHPC thin plate 2 paved on a steel beam 1 and a combined type shearing part 4 connected through a high-strength friction type bolt 3, wherein the combined type shearing part 4 is formed by combining a steel plate support 5, a large-diameter oblique short nail 6 and short nails 7 on the front end face and the rear end face.
The short nails are large pegs with the diameter of 30 mm.
The length of the bevel edge of the steel plate meets the requirements of the diameter and the welding of the short nail, and the thickness of the steel plate support is determined according to the length of the bevel edge and the inclination angle.
The bridge deck is a UHPC thin plate configured by hybrid fibers, the thickness of the UHPC thin plate is about 50mm, and the hybrid fibers are straight steel fibers with the volume mixing amount of 1% and steel fibers with hooks at the end parts of 1%.
The specific implementation process of the invention is as follows:
step 1: processing a trapezoidal steel plate support in a factory, reserving a bolt hole in the center of the steel plate support, and welding short nails on the bevel edge and the side edge of the steel plate support to form a steel plate support-cluster type inclined nail combined connecting piece;
step 2: drilling a hole in the steel beam, connecting the combined type shear part 4 to the steel beam 1 through the high-strength friction type bolt 3, arranging a gasket 12 and screwing a nut 11;
and step 3: and pouring the UHPC sheet layer, so that the steel beam and the UHPC sheet are connected through the shear part to form an integral combined section.
In this example, the UHPC sheet of step 3 is made of UHPC cast from hybrid fibers, including straight steel fibers and steel fibers with hooks at their ends, and the thickness of the UHPC sheet is determined by calculation according to actual mechanical property requirements.
The steel and UHPC thin plate combined structure system formed by the interface hybrid connection of the steel plate support-inclined nail combined type connecting piece is specifically adopted in the embodiment, the respective advantages of the stud nail and the steel plate support are comprehensively utilized, and the characteristics of large rigidity in a use state, good ductility in a limit state and the like are formed.
The UHPC bridge deck is adopted in the interface connection combined structure system, so that the self weight of the structure is reduced, and the durability of the structure is improved. The structural system has significant technical and economic value.
The lateral large-diameter stud in the combined structure system can provide certain lateral restraint for the shearing resistance of the steel plate support, and is beneficial to enhancing the shearing resistance rigidity of an interface.
The cluster type inclined nails arranged in the UHPC thin plate form a truss inclined web member system, and the truss web member can improve the lateral rigidity of the UHPC thin plate and the integral rigidity of a combined section.
The high-strength bolt in the combined structure system can adopt different pretightening forces and bolt diameters according to actual requirements, and the bolt connection is adopted to replace welding so as to realize quick construction efficiency.
The technical means disclosed in the invention scheme are not limited to the technical means disclosed in the above embodiments, but also include the technical scheme formed by any combination of the above technical features.
Claims (6)
1. A steel-UHPC sheet metal composite structure system that steel board holds in palm-quick assembly of cluster nail to one side, its characterized in that: the high-strength friction type bolt is connected with the steel beam through the connecting holes, the short nails are vertically arranged on the inclined planes at two sides of the steel plate support and on the front end face and the rear end face of the steel plate support, the UHPC thin plate is arranged above the steel beam, and the combined body of the steel plate support and the short nails is uniformly distributed inside the UHPC thin plate.
2. The steel-UHPC thin plate combined structural system for the rapid assembly of the steel plate bracket-cluster inclined nails as claimed in claim 1, wherein: the UHPC thin plate is made of UHPC doped with mixed fibers, and mainly adopts 1% of straight steel fibers and 1% of end hook fibers in volume mixing ratio respectively.
3. The steel-UHPC thin plate combined structural system for the rapid assembly of the steel plate bracket-cluster inclined nails as claimed in claim 1, wherein: the short nails are pegs with the diameter of 30 mm.
4. The steel-UHPC thin plate combined structural system for the rapid assembly of the steel plate bracket-cluster inclined nails as claimed in claim 1, wherein: the short nails on the inclined plane of the steel plate support are symmetrically arranged about the center of the inclined plane, and the short nails on the two inclined planes and the front and rear end faces are symmetrically arranged about the center line of the steel plate support.
5. The steel-UHPC thin plate combined structural system for the rapid assembly of the steel plate bracket-cluster inclined nails as claimed in claim 1, wherein: the short nails on the inclined planes on the two sides of the steel plate support are the same as the short nails on the front end surface and the rear end surface in size and shape.
6. The method for manufacturing the steel-UHPC thin plate combined structural system for the rapid assembly of the steel plate support-cluster inclined nails, according to the claim 1, is characterized in that: the method comprises the following steps:
step 1: processing a trapezoidal steel plate support in a factory, reserving a connecting hole in the center of the steel plate support, and welding short nails on the bevel edge and the front and rear end faces of the steel plate support to form a steel plate support-cluster type inclined nail combined shear member;
step 2: drilling a hole in the steel beam, connecting the combined type shear member to the steel beam through a high-strength friction type bolt, arranging a gasket and screwing a nut;
and step 3: and pouring the UHPC sheet layer, so that the steel beam and the UHPC sheet are connected through the shear part to form an integral combined section.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811496216.6A CN109736200B (en) | 2018-12-07 | 2018-12-07 | Steel-UHPC sheet combination structure system for quickly assembling steel plate support-cluster inclined nail |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811496216.6A CN109736200B (en) | 2018-12-07 | 2018-12-07 | Steel-UHPC sheet combination structure system for quickly assembling steel plate support-cluster inclined nail |
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| CN109736200A CN109736200A (en) | 2019-05-10 |
| CN109736200B true CN109736200B (en) | 2020-11-27 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110067313A (en) * | 2019-05-22 | 2019-07-30 | 重庆交通大学 | Pressure-bearing-shearing-type connector |
| CN110904807B (en) * | 2019-11-26 | 2021-03-02 | 南通万航船舶设计有限公司 | Pin-connected panel passenger footbridge structure |
Citations (5)
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|---|---|---|---|---|
| US5826290A (en) * | 1997-04-09 | 1998-10-27 | West Bridge Corp. | Reusable composite bridge structure and method of constructing and attaching the same |
| CN105239720A (en) * | 2015-11-18 | 2016-01-13 | 湖南大学 | Prefabricated assembled steel-concrete composite beam connected by adopting high-strength bolt |
| JP2016008394A (en) * | 2014-06-23 | 2016-01-18 | 大成建設株式会社 | Precast floor slab and connecting structure with main girder |
| CN107642031A (en) * | 2017-09-06 | 2018-01-30 | 河海大学 | Friction-type peg shear connector and its construction method |
| CN207176503U (en) * | 2017-07-27 | 2018-04-03 | 长安大学 | Based on the steel fiber reinforced concrete assembled steel bridge panel for bonding setback part |
-
2018
- 2018-12-07 CN CN201811496216.6A patent/CN109736200B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5826290A (en) * | 1997-04-09 | 1998-10-27 | West Bridge Corp. | Reusable composite bridge structure and method of constructing and attaching the same |
| JP2016008394A (en) * | 2014-06-23 | 2016-01-18 | 大成建設株式会社 | Precast floor slab and connecting structure with main girder |
| CN105239720A (en) * | 2015-11-18 | 2016-01-13 | 湖南大学 | Prefabricated assembled steel-concrete composite beam connected by adopting high-strength bolt |
| CN207176503U (en) * | 2017-07-27 | 2018-04-03 | 长安大学 | Based on the steel fiber reinforced concrete assembled steel bridge panel for bonding setback part |
| CN107642031A (en) * | 2017-09-06 | 2018-01-30 | 河海大学 | Friction-type peg shear connector and its construction method |
Non-Patent Citations (1)
| Title |
|---|
| 装配式钢-UHPC组合梁在中小跨径梁桥中的应用研究;王琦等;《2018世界交通运输大会》;20180618;第1-9页 * |
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