CN112342893A - Novel shear connector of steel-concrete combined section - Google Patents
Novel shear connector of steel-concrete combined section Download PDFInfo
- Publication number
- CN112342893A CN112342893A CN201910723921.3A CN201910723921A CN112342893A CN 112342893 A CN112342893 A CN 112342893A CN 201910723921 A CN201910723921 A CN 201910723921A CN 112342893 A CN112342893 A CN 112342893A
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- concrete
- steel
- section
- shear connector
- joint section
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
Abstract
The invention provides a novel shear structure of a steel-concrete joint section in a connecting steel beam of a hybrid beam cable-stayed bridge, which improves the shear structure form of the traditional steel-concrete joint section, improves the mechanical property of the existing structure, and improves the prefabricated assembly degree of components in bridge engineering.
Description
Technical Field
The invention relates to a novel technical scheme for improving a shear connector structure of a steel-concrete combined section, which can be applied to the field of civil engineering.
Technical Field
The main span of the hybrid beam cable-stayed bridge is completely or partially made of steel beams, the side span or part of the side span is made of concrete beams, the steel beams and the concrete beams are connected into a whole through a steel-concrete combined section, and the hybrid beam cable-stayed bridge has the advantages that the spanning capacity of the main span is large, the self weight of the main span can be balanced by the side span concrete beams, the integral rigidity of the structure is improved, the fatigue influence of a stay cable is reduced, the main tower and the side span can be constructed in parallel, and the hybrid beam cable-stayed bridge is.
The steel-concrete joint section is a transition section for connecting a steel beam and a concrete beam of the hybrid beam cable-stayed bridge, and the stress situation of the joint section is complex due to the great difference between the rigidity and the mass of the main beams at the two sides of the steel-concrete joint section, so that the steel-concrete joint section is a key part in the design of the main beams of the hybrid beam cable-stayed bridge. The reinforced concrete joint section is required to be capable of reliably and smoothly transmitting various internal forces between the steel beam and the concrete beam, and simultaneously, the shapes of the two parts of beam bodies are coordinated and consistent as much as possible, so that the rigidity and strength of the main beam are prevented from suddenly changing, and the joint section is ensured to have good fatigue resistance and durability.
The steel-concrete joint segment shear connector is one of the key components for internal force transmission between steel and concrete, and also plays the main role of preventing the steel plates of the joint segment from being separated from the poured concrete. The traditional welding nail has the advantages of good pulling resistance, convenient construction, large-scale batch production in factories and the like, and is most widely applied to combined structures. However, as the main beam of the existing large-scale hybrid beam cable-stayed bridge often bears huge axial load, the steel-concrete joint section usually needs to be provided with a large number of welding nails to ensure effective transmission of internal force of the joint section, but the construction of the joint section is inconvenient due to the large number of welding nails which are densely distributed. When the welding nail is used in a bridge structure, the problems of insufficient fatigue performance and the like of the welding nail gradually appear along with the increase of the service time.
In the aspect of pouring materials, the steel-concrete combined section of the hybrid beam cable-stayed bridge which is built and put into operation at home and abroad at present is poured by common concrete. The pouring quality and performance of the concrete are difficult to satisfy, the construction of the joint section is difficult due to the overlarge particle size of common concrete aggregate, and concrete voids with different degrees appear in the joint section; the shrinkage of the poured concrete is too large, the roof of the cell chamber of the combining section is empty from the concrete, and rainwater on the upper part permeates into the cell chamber through cracks of the pavement layer, so that the durability of the combining section is seriously influenced, and even the stress of the structure is endangered. Meanwhile, the concrete pouring of the combining section is not compact or shrinks and cracks, and the exertion of the shear resistance of the shear key is not facilitated; adversely affecting the structural stress and durability properties. Reactive Powder Concrete (RPC) is one of ultra-high performance Concrete (UHPC), and has the characteristics of high strength, small creep, good durability and the like. The RPC is adopted as the pouring material of the steel-concrete combined section, because the mechanical property of the PBL before entering the plastic stage is greatly influenced by concrete, the RPC has ultrahigh strength and does not contain coarse aggregate, the PBL formed by combining with the RPC is very different from the PBL of the common concrete in terms of force transmission mechanism, shearing resistance and damage form, and the problem existing in the common concrete pouring material is hopefully solved.
Disclosure of Invention
In view of the above, the invention provides a novel shear structure of a steel-concrete joint section in a connecting steel beam of a hybrid beam cable-stayed bridge, which improves the shear structure form of the traditional steel-concrete joint section, improves the prefabrication and assembly degree of components in bridge engineering, and simultaneously plays roles of connection and shear resistance by a connecting piece consisting of a steel pipe in a novel joint and concrete in the pipe.
The invention provides a novel shear connector of a steel-concrete combined section, aiming at solving the structural problem existing in the project at the present stage and improving the mechanical property of the existing structure. The bearing capacity of the shear connector mainly comprises the bonding-friction action between the perforated steel plate and concrete, the tenon action of steel pipe concrete in the hole and the bearing action of the concrete at the end part of the steel plate. Under the combined action, the shearing resistance of the connecting piece is improved, and the overall performance is further improved.
Compared with the prior art, the invention has the following beneficial effects
1. Researches show that the shear connector has the advantages of high shear bearing capacity, good fatigue resistance and the like. Different from other shear keys which only can play a role on one side of a steel plate, the concrete-filled steel tube tenons on the two sides of the perforated plate participate in shearing resistance, so that the shearing resistance of the concrete-filled steel tube tenon is larger than that of other shear keys with the same size, and the integral shearing resistance is improved.
2. Based on the fact that common concrete is mostly used in the current engineering, a plurality of problems exist: large particle size of coarse aggregate, large shrinkage performance and the like. The material has the following excellent properties by adopting the self-developed reactive powder concrete: the concrete pouring structure has the advantages that the fluidity is good, the aggregate particle size is appropriate, a large number of shear bonds are usually arranged on the steel-concrete combining section easy to pour and construct, meanwhile, longitudinal stressed steel bars of the concrete beam section are more extended into the combining section and are mutually staggered with prestressed steel strands anchored on a bearing plate, and even if the pouring space of concrete in the steel-concrete combining section is narrow, the vibration construction is convenient; the contraction is small, the combination between the steel grating chambers and the concrete can be effectively ensured under the reciprocating action of the load of the upper vehicle, and the bridge deck pavement of the steel-concrete combination section is less prone to damage than other parts of the main beam; the steel beam and concrete composite beam has the advantages that the rigidity is high, the toughness is good, the fatigue strength is high, the mechanical matching steel-concrete combination section between the steel beam and the concrete is ensured to be used as the transition section between the steel beam and the concrete beam, and the mass and rigidity of the main beams on the two sides are greatly different; has mechanical properties between steel and concrete;
drawings
FIG. 1 is a three-dimensional view of a shear connector of a novel steel-concrete joint section
FIG. 2 is a left side view of a shear connector of a novel steel-concrete joint section
Wherein: 1. perforated plate, 2, concrete, 3, 20mm thick 100mm long steel tube tenon
Detailed Description
The thickness and the diameter of the steel pipe are set according to actual requirements, UHPC concrete is adopted in the steel pipe, tenons in the connecting piece can be prefabricated firstly, and the steel pipe can be transported to the site and welded with steel plates in the steel-concrete combined section when the concrete reaches a certain strength degree.
The embodiments described above are presented to enable a person having ordinary skill in the art to make and use the invention. It will be readily apparent to those skilled in the art that various modifications to the above-described embodiments may be made, and the generic principles defined herein may be applied to other embodiments without the use of inventive faculty. Therefore, the present invention is not limited to the above embodiments, and those skilled in the art should make improvements and modifications to the present invention based on the disclosure of the present invention within the protection scope of the present invention.
Claims (3)
1. The shear connector of the steel-concrete combined section is characterized in that: the steel plate is provided with a hole, a section of the steel plate is arranged in the hole and forms a concrete-filled steel tube tenon with concrete, and the steel plate is butted with the concrete-filled steel tube tenon at 90 degrees.
2. Dimensional characteristics of the shear connector: a 100mm long steel tube 20mm thick.
3. The manufacturing steps of the shear connector are as follows: prefabricating a steel plate with holes, welding the steel plate with the steel pipe, and pouring active powder concrete.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910723921.3A CN112342893A (en) | 2019-08-06 | 2019-08-06 | Novel shear connector of steel-concrete combined section |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910723921.3A CN112342893A (en) | 2019-08-06 | 2019-08-06 | Novel shear connector of steel-concrete combined section |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112342893A true CN112342893A (en) | 2021-02-09 |
Family
ID=74366376
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910723921.3A Pending CN112342893A (en) | 2019-08-06 | 2019-08-06 | Novel shear connector of steel-concrete combined section |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112342893A (en) |
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2019
- 2019-08-06 CN CN201910723921.3A patent/CN112342893A/en active Pending
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20210209 |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Yang Hexian Document name: Deemed withdrawal notice |