CN109487699A - A kind of steel plate support-skew nailing combined type interface connection steel-UHPC thin plate combined structure system - Google Patents

A kind of steel plate support-skew nailing combined type interface connection steel-UHPC thin plate combined structure system Download PDF

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Publication number
CN109487699A
CN109487699A CN201811496215.1A CN201811496215A CN109487699A CN 109487699 A CN109487699 A CN 109487699A CN 201811496215 A CN201811496215 A CN 201811496215A CN 109487699 A CN109487699 A CN 109487699A
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China
Prior art keywords
steel
plate support
uhpc
steel plate
thin plate
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CN201811496215.1A
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Chinese (zh)
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CN109487699B (en
Inventor
王景全
徐启智
姚鸣
姚一鸣
张凡
殷惠光
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东南大学
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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 present invention discloses a kind of steel plate support-skew nailing combined type interface connection steel-UHPC thin plate combined structure system, and ultra-thin floorings are made using ultra-high performance concrete (UHPC), can reduce dead load, enhancing structure span ability;Simultaneously when interface carries out interface connection using the combined type connector with skew nailing containing plate support, comprehensive advantage of the steel plate as rigid connector and peg as flexible connecting member can be played, it is set to utilize the rigid connection of steel plate plate support in serviceability limit stage, reduce interface sliding amount, in limiting condition, using peg flexible connecting member feature, steel plate support is made up as the insufficient defect of rigid connector ductility.In UHPC plate, the interlaced arrangement of short skew nailing can form the stiffening truss web member of UHPC plate, the rigidity of UHPC plate be improved, to enhance the overall stiffness of compound section.

Description

A kind of steel plate support-skew nailing combined type interface connection steel-UHPC thin plate combined structure system
Technical field
The invention belongs to the composite structure fields in field of civil engineering, and in particular to one kind is by girder steel and ultra-thin UHPC bridge The combined bridge structural system and associated interface interconnection technique of panel composition.
Background technique
Traditional steel-concrete combined structure is mainly formed girder steel with normal concrete floorings by shear connectors such as pegs The common stress in compound section.Relative to steel bridge construction system, composite bridge can reduce structural cost, and relative to coagulation Dead load can be effectively reduced in native bridge, composite bridge again.Therefore the structural system has given full play to steel construction and coagulation Advantage of the soil structure in terms of workability and mechanical property, while but also with good economy.But domestic and foreign scholars' grinds Study carefully and show: common steel reinforced concrete combined bridge structure limits the span ability of structure since its concrete slab is from great.And The construction cost that the larger self weight of superstructure will lead to substructure is higher, further constrains the applicability of composite structure. Simultaneously normal concrete floorings due to characteristics the make structure such as tensile strength is low there are it is easy to crack the problems such as, influence the resistance to of structure Long property etc..
To solve the problems such as normal concrete floorings easily crack, the widest technology hand applied in engineering at present Section is to apply certain compression deposit using prestressing technique, although these measures to a certain extent can be to problem of Cracking Etc. limiting, but which increase construction cost and difficulties, and the shrinkage and creep of concrete itself is also easy to cause part to answer in advance Power loss.
It is self-possessed the problems such as larger for the floorings of common steel reinforced concrete composite bridge, at present mainly using hollow in engineering Section or application certain level prestressing force etc. mitigate dead load.Although these measures can reduce structure certainly to a certain extent Weight, but make work progress complicated simultaneously, it is not easy to implement.
Summary of the invention
To solve the above problems, the invention discloses a kind of steel plate support-skew nailing combined type interfaces to connect steel-UHPC thin plate group Structural system is closed, mainly reduces compressive region plate thickness using the higher compression strength of UHPC, mitigates dead load to reach Purpose.It is furnished with assorted fibre in UHPC simultaneously, is capable of the tensile strength of larger raising UHPC, reaching prevents UHPC floorings from opening The effect split.In the connection of interface, combine to form combined type Shear connection technology by using the short nail of major diameter and steel plate support, So that steel plate support and Welded-Stud Conectors play a role respectively in serviceability limit stage and limiting condition, it is rigid-soft to form different phase Controllable composite structure new system.Both the ultimate bearing capacity of composite structure had been improved, while having compensated for rigid connector ductility not The defect of foot.
In order to achieve the above objectives, technical scheme is as follows:
A kind of steel plate support-skew nailing combined type interface connection steel-UHPC thin plate combined structure system, including girder steel, UHPC thin plate, steel Plate support, short nail, the steel plate support are isosceles trapezoidal structure, and the bottom surface of multiple steel plate supports is connect with girder steel, and the short nail is vertically set It sets on the inclined-plane of steel plate support two sides, the UHPC thin plate is arranged above girder steel, and steel plate support and the assembly of short nail uniformly divide Cloth is inside UHPC thin plate.
Further, the short nail uses diameter for the major diameter peg of 30mm, peg height and UHPC plate thickness phase It adapts to.
Further, the steel plate support the length of the hypotenuse is determined according to peg diameter and bevel edge inclination angle, and steel plate longitudinally welds It stitches length to be determined according to the length of the hypotenuse and inclination angle, the control of bevel edge best angle is advisable in 30 to 60 degree.
Further, the UHPC thin plate needs to be made of the UHPC of incorporation assorted fibre, mainly uses body Product volume is respectively 1% straight steel fibre and 1% end hooked fibre.
Further, the UHPC thin plate of the 50-80mm thickness is mainly according to steel plate plate support thickness, peg inclination angle and peg The geometrical relationship of height determines.
The beneficial effects of the present invention are:
1. the invention uses diameter for the big short nail connection of 30mm in interface, it is welded on plate support bevel edge, increases bolt Nail and plate support interface shearing strength, improve the globality that peg is connected with plate support.
2. invention integrated use steel plate support and the short nail of major diameter are used as shear connector respective advantage.In external load Early period is acted on, feature of the steel plate as rigid interface connector is relied primarily on, reduces its interface sliding, in the load action later period, Due to the flexible shear feature of peg, moderate finite deformation is generated, structural limits state Ductility Requirement is met.
3. the tensile strength with higher because mixing assorted fibre of UHPC thin plate used by, can be improved hogging moment area Crack resistance, and its higher density and the fractue spacing feature of " narrow and close " are conducive to improve the durability of structure.
4. the new composite structure system can inclination angle by adjusting the inclination angle of steel plate support to control oblique peg, thus The anti-side rigidity for changing peg, makes it meet the needs of limiting condition slip property.
5. the structural system improves the shear stiffness at interface by the rigid connection of plate support, rigidity characteristics and UHPC(are super High performance concrete) high resistance to compression feature be adapted, the big advantage of its rigidity can be given full play to.And under limiting condition, make Peg is destroyed prior to steel plate support, has both improved effective shear connections at interface, while peg flexible connection feature is utilized, It is horizontal to improve structure ductility.
6. oblique short nail can form the truss web of UHPC thin plate in the structural system, the anti-side for increasing UHPC thin plate is rigid Degree reduces interface sliding amount to reinforce the section rigidity of UHPC thin plate.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention.
Fig. 2 is that girder steel of the present invention and UHPC thin plate system and interface integral arrangement connect schematic diagram.
Reference signs list:
1- girder steel, 2-UHPC thin plate, 3- steel plate support, the short nail of 4-.
Specific embodiment
With reference to the accompanying drawings and detailed description, the present invention is furture elucidated, it should be understood that following specific embodiments are only For illustrating the present invention rather than limiting the scope of the invention.It should be noted that word " preceding " used in the following description, " rear ", "left", "right", "up" and "down" refer to that the direction in attached drawing, word "inner" and "outside" refer respectively to direction or remote Direction from geometric center of specific component.
Embodiment:
The present invention is a kind of novel high-performance steel-UHPC thin plate combined structure system and interface interconnection technique adaptable therewith. The structural system mainly includes the UHPC thin plate 2 being layered on girder steel 1 and the combined type shear connector welded on girder steel 1, Middle combined type shear connector is composed of short 4 welding of nail of steel plate support 3 and major diameter.
The oblique peg uses the major diameter peg of diameter 30mm.
The steel plate the length of the hypotenuse meets short nail diameter and welding requirements, and steel plate support thickness is according to the length of the hypotenuse and inclination angle It determines.
The floorings use assorted fibre configuration UHPC thin plate, thickness by steel plate support thickness, skew nailing height, Steel plate support inclination angle geometrical relationship calculates gained, and assorted fibre is using straight steel fibre and end band crotch steel fibre.
Specific implementation process of the present invention is as follows:
Step 1: in the steel plate support that factory process designs well, short nail 4 being welded on the bevel edge of steel plate support 3, it is oblique to form steel plate support- Follow closely combined type connector;
Step 2: combined type connector being welded on girder steel 1, welding requirements meets Code for design of steel structures (GB50017- 2003) relevant regulations in;
Step 3: pouring UHPC thin plate layer, girder steel is made to connect to form Integral combined structure by combined type with UHPC thin plate 2.
In this example, the skew nailing in the steel plate support 1 of step 1 is arranged symmetrically about plate support inclined-plane and plate support longitudinal center.
In this example, the UHPC thin plate 2 of step 3 is made of the UHPC that assorted fibre is prepared is poured, including straight The steel fibre of steel fibre and end with crotch, thickness are determined according to practical mechanics performance requirement.
This example specifically use by steel plate support-skew nailing combined type connector carry out intermixing connect to be formed it is novel Steel and 2 combined structure system of UHPC thin plate, fully utilize peg and the respective advantage of steel plate support, form under use state just The features such as ductility is good under degree is big and limiting condition.
UHPC floorings are used in the novel interfacial composite construction for connecting system, not only alleviate dead load, but also improve Structure durability.Therefore the structural system has significant technology and economic value.
The skew nailing being arranged in UHPC thin plate 2 forms truss diagonal web member system, which can be improved UHPC thin plate Anti-side rigidity, improve the overall stiffness of compound section.
The technical means disclosed in the embodiments of the present invention is not limited only to technological means disclosed in above embodiment, further includes Technical solution consisting of any combination of the above technical features.

Claims (5)

1. a kind of steel plate support-skew nailing combined type interface connects steel-UHPC thin plate combined structure system, it is characterised in that: including steel Beam (1), UHPC thin plate (2), steel plate support (3), short nail (4), the steel plate support (3) are isosceles trapezoidal structure, multiple steel plate supports (3) Bottom surface connect with girder steel (1), the short nail (4) is vertically set on the inclined-plane of steel plate support (3) two sides, the UHPC thin plate (2) above girder steel (1), it is internal that the assembly of steel plate support (3) and short nail (4) is evenly distributed on UHPC thin plate (2) for setting.
2. a kind of steel plate support according to claim 1-skew nailing combined type interface connects steel-UHPC thin plate composite structure body System, it is characterised in that: the UHPC thin plate (2) is made of the UHPC of incorporation assorted fibre, is mainly mixed using volume Amount is respectively 1% straight steel fibre and 1% end hooked fibre.
3. a kind of steel plate support according to claim 1-skew nailing combined type interface connects steel-UHPC thin plate composite structure body System, it is characterised in that: short nail (4) uses the short peg of major diameter of 30mm diameter.
4. a kind of steel plate support according to claim 1-skew nailing combined type interface connects steel-UHPC thin plate composite structure body System, it is characterised in that: the short nail on the bevel edge of steel plate support two sides is arranged in bevel edge center, and symmetrical about steel plate support center line Arrangement.
5. a kind of steel plate support according to claim 1-skew nailing combined type interface connects steel-UHPC thin plate combined structure system Production method, it is characterised in that: the following steps are included:
Step 1: in the good trapezoidal steel plate support (3) of factory process, short nail (4) being welded on the bevel edge of steel plate support (3), forms steel plate Support-skew nailing combined type connector;
Step 2: combined type connector is welded on girder steel (1);
Step 3: pouring UHPC thin plate layer, girder steel (1) is made to connect to form entire combination knot by combined type with UHPC thin plate (2) Structure.
CN201811496215.1A 2018-12-07 2018-12-07 Steel plate support-inclined nail combined type interface connection steel-UHPC thin plate combined structure system Active CN109487699B (en)

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Citations (8)

* Cited by examiner, † Cited by third party
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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
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

Patent Citations (8)

* 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
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

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
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