CN109487698B - Steel plate support-inclined nail combined type quick connection steel-UHPC combined structure system - Google Patents

Steel plate support-inclined nail combined type quick connection steel-UHPC combined structure system Download PDF

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Publication number
CN109487698B
CN109487698B CN201811494892.XA CN201811494892A CN109487698B CN 109487698 B CN109487698 B CN 109487698B CN 201811494892 A CN201811494892 A CN 201811494892A CN 109487698 B CN109487698 B CN 109487698B
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steel
uhpc
steel plate
plate support
combined
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CN109487698A (en
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王景全
徐启智
张凡
姚一鸣
曾永平
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Southeast University
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Southeast University
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    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D21/00Methods or apparatus specially adapted for erecting or assembling bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D19/00Structural or constructional details of bridges
    • E01D19/12Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01DCONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D2101/00Material constitution of bridges
    • E01D2101/20Concrete, stone or stone-like material
    • E01D2101/24Concrete
    • E01D2101/26Concrete reinforced
    • E01D2101/262Concrete reinforced with steel fibres

Abstract

The invention discloses a steel plate support-inclined nail combined type quick connection steel-UHPC combined structure system, which comprises a steel beam, an UHPC thin plate, a steel plate support and short nails, wherein the steel plate support is in an isosceles trapezoid structure, the steel plate support is connected with the steel beam through high-strength bolts, the short nails are vertically arranged on inclined planes at two sides of the steel plate support, the UHPC thin plate is poured above the steel beam, and a combined body of the steel plate support and the short nails is uniformly distributed in the UHPC thin plate; meanwhile, when the combined connecting piece with the inclined nails and a steel plate support is adopted at the interface for interface connection, the comprehensive advantages of rigid connection of the steel plate and flexible connection of the stud can be exerted, so that the steel plate can be used as the rigid connection of the steel plate support in the normal use stage, the interface slippage is reduced, and in the UHPC plate, the short inclined nails can be used as stiffening trusses of the UHPC plate in a staggered manner, so that the rigidity of the UHPC plate is improved, and the overall rigidity of the combined section is enhanced.

Description

Steel plate support-inclined nail combined type quick connection steel-UHPC combined structure system
Technical Field
The invention belongs to the field of composite structures in the field of civil engineering, and particularly relates to a composite bridge structure system formed by steel beams and ultra-thin UHPC bridge decks and an interface connection technology related to the composite bridge structure system.
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 characteristics of low tensile strength and the like, and the durability of the structure is influenced. And the high-strength bolt connection is adopted to replace a welding process, so that the rapid construction of the bridge is realized.
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 plate support-inclined nail combined type quick connection steel-UHPC combined structure system. The plate thickness of a pressed area is reduced by mainly utilizing the higher compressive strength of UHPC, 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 role in a normal use stage and a limit state, and a new rigid-flexible controllable combined structure system 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. The bolts are adopted to replace welding and the like to connect the steel plate support and the steel beam, so that the rapid construction of the bridge can be accelerated.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a steel plate support-inclined nail combined type quick connection steel-UHPC combined structure system comprises a steel beam, an UHPC thin plate, 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 PVC pipe is arranged in the connecting hole, a high-strength bolt penetrates through the PVC pipe and is connected with the steel beam, the short nails are vertically arranged on inclined planes on two sides of the steel plate support, the UHPC thin plate is poured above the steel beam, and a combined body of the steel plate support and the short nails is uniformly distributed inside the UHPC thin plate.
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.
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, and 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.
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 thickness of the UHPC thin plate is mainly determined according to the geometrical relation among the thickness of the steel plate support, the dip angle of the stud and the height of the stud.
Furthermore, the diameter of the PVC pipe is slightly larger than that of the high-strength bolt screw and is slightly smaller than that of a preformed hole in the steel beam.
Furthermore, the high-strength bolt determines the strength grade and the diameter of the screw according to the interface shearing resistance requirement.
The invention has the beneficial effects that:
1. the interface of the invention is connected by adopting the large and short nails with the diameter of 30mm, and the large and short nails are welded on the oblique edge of the plate support, thus increasing the shear strength of the interface of the oblique stud and the plate support and improving the integrity of the connection of the stud and the plate support.
2. The invention comprehensively utilizes the advantages of the steel plate support and the large-diameter short nail as the shear connector. In the earlier stage of the external load action, the interface slippage is reduced mainly by the characteristic that the steel plates connected by the high-strength bolt are used as rigid connecting pieces, and the interface shear resistance is controlled by the pretightening force of the high-strength bolt and the diameter of the screw; in the later stage of the load action, due to the flexible shear-resistant characteristic of the stud, large deformation is generated, and the ductility requirement of the structure in the limit state is met.
3. The UHPC (ultra high performance concrete) thin plate has higher tensile strength due to the mixed fiber, can improve the crack resistance of a hogging moment area, and has higher compactness and narrow and dense crack distribution characteristics, thereby being beneficial to improving the durability of the structure.
4. The novel combined structure system can control the inclination angle of the oblique stud through 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; and under the limit state, the stud is damaged before the steel plate support, so that the effective shear connection of the interface is improved, and meanwhile, the ductility level of the structure is improved by utilizing the flexible connection characteristic of the stud.
6. The inclined short nails in the structural system can form truss web members of the UHPC thin plate, so that the lateral stiffness of the UHPC thin plate is increased, and the section stiffness of the UHPC thin plate is enhanced.
7. According to the structural system, the steel plate support and the steel beam are connected into a whole by adopting the high-strength bolt, so that the rapid construction of the bridge is realized, the influence of residual stress on the steel beam in the welding process is avoided, and the fatigue performance of an interface is effectively improved; when the bolt is damaged, the UHPC plate (including the steel plate support) can be integrally dismantled, the steel beam can be repeatedly utilized, and the resources are effectively saved.
Drawings
FIG. 1 is a block diagram of a modular architecture and interfacing connectors useful in the present invention;
FIG. 2 is a longitudinal cross-sectional view of the composite structural system of the present invention;
the reference numbers in the figures illustrate:
1-steel beam, 2-UHPC thin plate, 3-combined type shear part, 4-steel plate support, 5-short nail, 6-high strength bolt, 7-screw, 8-gasket and 9-nut.
Detailed Description
The technical solution of the present invention is described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the embodiments.
Example (b):
the invention relates to a novel 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 shear part 3 and a high-strength bolt 6 which are welded on the steel beam 1, wherein the combined type shear part 3 is formed by welding and combining a steel plate support 4 and a large-diameter short inclined nail, and is fixed by penetrating the high-strength bolt 6 through a reserved hole on the steel plate support.
The oblique bolt adopts a bolt with the diameter of 30 mm.
The length of the bevel edge of the steel plate support meets the requirements of the diameter and 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 bridge deck is determined according to geometric conditions such as bearing capacity requirements, arrangement of shearing parts and the like, and the hybrid fibers are straight steel fibers and steel fibers with hooks at the end parts.
The specific implementation process of the invention is as follows:
step 1: a designed steel plate support is processed in a factory, a bolt connecting hole is reserved in the center of the steel plate support, and an oblique short nail is welded on the oblique edge of the steel plate support to form a steel plate support-oblique nail combined type shearing force piece 3;
step 2: drilling a hole in the steel beam, reserving a screw hole for mounting the high-strength bolt, and inserting a PVC pipe into the hole, wherein the diameter of the PVC pipe is slightly larger than that of the screw;
and step 3: pouring a UHPC sheet layer to enable the steel beam 1 and the UHPC sheet 2 to be connected through a shearing part to form an integral combined section;
and 4, step 4: a screw 7 of a high-strength bolt 6 is inserted into the PVC pipe, and a gasket 8 and a nut 9 are installed, so that the UHPC thin plate and the steel beam are connected into a whole.
In this example, the thin UHPC sheet 2 of step 3 is cast from UHPC made from hybrid fibers, including straight steel fibers and hooked end steel fibers, and the thickness is calculated from the thickness of the plate support, the pin inclination angle and the pin height.
In the embodiment, a novel steel and UHPC thin plate combined structure system formed by connecting a steel plate support and inclined nails through high-strength bolts is adopted, the advantages of the connection of the bolts and the bolts are comprehensively utilized, and in the using stage, the restraint of the combined connecting piece by large-diameter inclined short nails and the restraint of the pretightening force of high-strength bolts on a steel beam-UHPC thin plate interface are mainly relied on to limit the relative sliding at the interface. In the limit state, the ductility level of the bolt connecting piece is improved by utilizing the better deformability of the bolt connecting piece, and the characteristics of large rigidity in the use state, good ductility in the limit state and the like are formed.
The novel interface connection combined structure system adopts the UHPC bridge deck, thereby not only reducing the self weight of the structure, but also improving the durability of the structure. The structural system has significant technical and economic value.
In the limit state, when the high-strength bolt of the combined connecting piece is sheared and damaged, the bolt can be disassembled, the UHPC plate (including the steel plate support) is integrally disassembled, and the steel beam is secondarily utilized.
The 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 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 plate support-inclined nail combined type quick connection steel-UHPC combined structure system is characterized in that: the steel plate support is of an isosceles trapezoid structure, connecting holes are formed in the steel plate support, preformed holes are formed in the steel beam, PVC pipes penetrate through the connecting holes and the preformed holes, high-strength bolts penetrate through the PVC pipes and are connected with the steel beam, the short nails are vertically arranged on the inclined planes of the two sides of the steel plate support, the UHPC thin plate is poured above the steel beam, and combined bodies of the steel plate support and the short nails are evenly distributed inside the UHPC thin plate.
2. The steel plate bracket-inclined nail combined type quick connection steel-UHPC combined structure system of claim 1, which is characterized in that: 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 plate bracket-inclined nail combined type quick connection steel-UHPC combined structure system of claim 1, which is characterized in that: the short nails are pegs with the diameter of 30 mm.
4. The steel plate bracket-inclined nail combined type quick connection steel-UHPC combined structure system of claim 1, which is characterized in that: the short nails on the bevel edges of the two sides of the steel plate support are arranged at the center of the bevel edge and are symmetrically arranged about the center line of the steel plate support.
5. The steel plate bracket-inclined nail combined type quick connection steel-UHPC combined structure system of claim 1, which is characterized in that: the diameter of the inserted PVC pipe is larger than that of the screw of the high-strength bolt and smaller than that of the preformed hole in the steel beam.
6. The manufacturing method of the steel plate bracket-inclined nail combined type quick connection steel-UHPC combined structure system according to claim 1, characterized in that: the method comprises the following steps:
step 1: processing a designed steel plate support in a factory, reserving a bolt connecting hole in the center of the steel plate support, and welding an inclined short nail on an inclined edge of the steel plate support to form a steel plate support-inclined nail combined type shearing force piece;
step 2: drilling a hole in the steel beam, reserving a screw hole for mounting the high-strength bolt, and inserting a PVC pipe into the hole, wherein the diameter of the PVC pipe is larger than that of the screw;
and step 3: pouring a UHPC sheet layer, and connecting the steel beam and the UHPC sheet to form an integral combined section through a shearing part;
and 4, step 4: and inserting a screw rod of a high-strength bolt into the PVC pipe, and installing a gasket and a nut to connect the UHPC thin plate and the steel beam into a whole.
CN201811494892.XA 2018-12-07 2018-12-07 Steel plate support-inclined nail combined type quick connection steel-UHPC combined structure system Active CN109487698B (en)

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Application Number Priority Date Filing Date Title
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Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002309706A (en) * 2001-04-18 2002-10-23 Ishikawajima Constr Materials Co Ltd Stud of composite girder or the like
KR20030094767A (en) * 2002-06-07 2003-12-18 심창수 Composite Bridge having Easy Replacing Shear Connection Structure and Constructing Method thereof
CN203603029U (en) * 2013-11-05 2014-05-21 上海市政工程设计研究总院(集团)有限公司 Shearing force connecting piece and composite beam with same
CN104100004A (en) * 2013-04-07 2014-10-15 同济大学 Steel and concrete combined connecting piece with changeable dual column caps
CN105672116A (en) * 2016-02-02 2016-06-15 河海大学 Prefabricated structure for steel-concrete combination beam
CN106638304A (en) * 2016-12-30 2017-05-10 东南大学 UHPC-common-concrete-lamination composite bridge-deck-slab construction and constructing method thereof
CN108660948A (en) * 2018-05-15 2018-10-16 浙江大学 Detachable Prefabricated combined beam screw and combination beam

Family Cites Families (1)

* Cited by examiner, † Cited by third party
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

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002309706A (en) * 2001-04-18 2002-10-23 Ishikawajima Constr Materials Co Ltd Stud of composite girder or the like
KR20030094767A (en) * 2002-06-07 2003-12-18 심창수 Composite Bridge having Easy Replacing Shear Connection Structure and Constructing Method thereof
CN104100004A (en) * 2013-04-07 2014-10-15 同济大学 Steel and concrete combined connecting piece with changeable dual column caps
CN203603029U (en) * 2013-11-05 2014-05-21 上海市政工程设计研究总院(集团)有限公司 Shearing force connecting piece and composite beam with same
CN105672116A (en) * 2016-02-02 2016-06-15 河海大学 Prefabricated structure for steel-concrete combination beam
CN106638304A (en) * 2016-12-30 2017-05-10 东南大学 UHPC-common-concrete-lamination composite bridge-deck-slab construction and constructing method thereof
CN108660948A (en) * 2018-05-15 2018-10-16 浙江大学 Detachable Prefabricated combined beam screw and combination beam

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