CN101831866A - Steel-concrete joint section structure of beams - Google Patents
Steel-concrete joint section structure of beams Download PDFInfo
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- CN101831866A CN101831866A CN 201010168569 CN201010168569A CN101831866A CN 101831866 A CN101831866 A CN 101831866A CN 201010168569 CN201010168569 CN 201010168569 CN 201010168569 A CN201010168569 A CN 201010168569A CN 101831866 A CN101831866 A CN 101831866A
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Abstract
The invention discloses a steel-concrete joint section structure of beams, which comprises a steel beam, a concrete beam and a bearing plate, wherein the steel beam is sheathed outside the concrete beam, thereby forming a transition section from the concrete beam to the steel beam; the steel beam web in the transition section is inserted into the concrete beam web to form a steel-concrete composite section; an upper and lower closed compartments are arranged in the transition section; the bearing plate is a steel plate of which the cross section being exactly matched with that of the steel beam; each contact site of the steel beam and the concrete beam in the transition section is provided with a shearing force toggle pin; the steel beam top plate and the steel beam bottom plate are respectively provided with a U-shaped ribbed stiffener; each U-shaped ribbed stiffener is welded with an pi-shaped ribbed stiffener; and the height of the pi-shaped ribbed stiffeners gradually increases from the steel beam side to the concrete beam side. The steel-concrete joint section of beams can be widely used in various composite beam bridges, such as continuous bridges, stayed-cable bridges, suspension bridges and arch bridges, and can solve the problems of complex process and manufacture, difficult construction operation and low fatigue resistance at the steel-concrete joint section.
Description
Technical field
The present invention relates to a kind of structure of steel-concrete adapter section, relate in particular to a kind of structure of steel-concrete adapter section of beam.
Background technology
The steel-concrete adapter section mainly appears at and mixes in the beam bridge, mix beam bridge and originate in continuous girder bridge, when end bay with in during span length smaller, end bay adopts deadweight and the bigger concrete beam of rigidity, in stride the then lighter girder steel of employing, can avoid end bay end fulcrum to produce the dead load moment of flexure of striding in negative reaction and the balance, and the rigidity and the wind resisting stability of structure can also improve the girder cantilever construction time.The joint of girder steel and concrete beam is the steel-concrete adapter section from the above mentioned.Because economic rationality, engineering reliability, the steel-concrete adapter section has been widely used in the multiple bridge constructions such as continuous girder bridge, rigid frame bridge, cable stayed bridge, suspension bridge and arch bridge at present.
For a long time, steel and concrete are the main materials of bridge construction, and these two kinds of materials have very big-difference on physical property and mechanical property.Adopt the bridge of steel or concrete homogenous material, its structural performance often is subjected to the not enough in some aspects restriction of material behavior.Steel tensile strength height, but lateral deflection poor performance, from heavy and light but price is expensive, speed of application is fast but the application maintenance load is big, ductility and toughness height but the low slightly distortion of rigidity is big slightly; In contrast, the concrete material compressive property is good but tensile property is poor, low price but from great, speed of application is slow, and earthquake inertia force is big, and anti-seismic performance is relatively poor, and, use the sandstone material of in site recovery in a large number, also be unfavorable for environmental protection.
For mixing the beam bridge particular structure, the adapter section of girder steel and concrete beam is sudden change place of material behavior, when the structure of selected adapter section, to note even genial Stress Transfer smooth and easy of rigidity transition between girder steel and the concrete beam especially, avoid producing excessive stress and concentrate and knuckle, guarantee that beam is durable in use and vehicle ' is steadily comfortable; Simultaneously, also to consider the convenience of girder steel and concrete beam adapter section construction.
The hybrid beam cable stayed bridge is a kind of mixing beam bridge of using steel-concrete adapter section structure, the steel-concrete adapter section is the key position of hybrid beam cable stayed bridge, because the difference of this binding site two layers of material character, beam rigidity, intensity are undergone mutation at this, how adapter section transmits powerful axle power and shearing, the hard and soft smooth-going transition of implementation structure, is vital key technology.Therefore, internal force that the various loads of transmission that the structure of steel-concrete adapter section should be able to be smooth produce (axle power, shearing and moment of flexure) and distortion, and have good antifatigue and durability, basically identical is also answered in the profile transition of its girder steel and concrete beam.Therefore, the steel-concrete adapter section position complex structure of beam is necessary it is furtherd investigate, to guarantee its globality and reliability.
The joint construction of concrete beam and girder steel is a very important position, and this is determined by steel-concrete hybrid beam self character.Concrete beam both can be that reinforced concrete beam also can be a prestressed concrete beam.Reliable in order to ensure connecting, avoid making it to become the weak spot of full-bridge, must consider following factors and take appropriate measures:
(1) because concrete beam is bearing very big axial force, be the additional bending moment of avoiding the sudden change of connecting portion section center of gravity to cause, require the girder steel center of gravity and the concrete beam center of gravity of connecting portion to coincide as far as possible, and require the center of gravity of corresponding web and top, base plate also to overlap substantially, prevent that the web of girder steel and top, base plate from producing local buckling and unstability.
(2) reliably for guaranteeing being connected of girder steel and concrete beam, and effective transmit powerful axial force, (with the concrete beam lap) must burn-on shearing resistance peg or shearing resistance device on girder steel smooth-goingly.
(3) by the transverse bending moment of wind load generation and the vertical bending moment of mobile load generation, also can produce tensile stress, therefore also must apply certain longitudinal prestressing and afford redress the coupling part at connecting portion.
At present, to four kinds of patterns of Fig. 1 (d), 10 is bearing plate to the main pattern of steel-concrete combination among the figure just like Fig. 1 (a), and 20 is fill concrete, and 30 is prestressed strand, 40 girder steels, 50 concrete beam.
Fig. 1 (a) shows a kind of total cross-section and connects the pressure-bearing technical scheme.This scheme is to rely on the pressure-bearing steel plate to bear the longitudinal pressure of beam, in the girder steel end bearing plate that dividing plate becomes grid structures is set, it is less to utilize this total cross-section to connect its junction stress of pressure-bearing technical scheme, but the steel bundle is anchored in the grid structures that the girder steel end forms by dividing plate, the anchor type complexity, constructing operation inconvenience.
Fig. 1 (b) shows the technical scheme that a kind of total cross-section connects fill concrete.For the power on the girder steel is passed to the overall beam cross section, fill concrete in the whole section scope of girder steel utilizes this its Stress Transfer of total cross-section connection fill concrete technical scheme more even, but steel bundle anchor type complexity, stiffness variation is violent.
Fig. 1 (c) shows a kind of part and connects the bearing plate technical scheme.For the power on the girder steel is delivered on the concrete beam, on the girder steel top, base plate and web end establish bearing plate, by the direct power transmission of bearing plate.Utilize this technical scheme power transmission direct, but the variation of section rigidity is rapider.
Fig. 1 (d) shows a kind of part and connects the fill concrete technical scheme.For near the part that the power on the girder steel is delivered to top, base plate and the web connects, at a double-walled steel of joint portion system case, and concrete perfusion therein, thereby steel case and crossbeam are linked to be an integral body.Relatively its rigidity transition is more even for this technical scheme and above-mentioned other several technical schemes, but structure is very complicated, and double-walled steel case processing and manufacturing difficulty, and concrete perfusion requires also very high.
Summary of the invention
The present invention considers structure stress, the composite factors such as structure requirement, easy construction and construction costs of the steel-concrete adapter section of beam, a kind of structure of steel-concrete adapter section of beam is provided, solved in the prior art that steel-concrete adapter section fatigue resistance is poor, processing and manufacturing complexity, constructing operation difficult technologies problem, the design of hybrid beam is from now on had very important realistic meaning.
In order to solve the problems of the technologies described above, the technical scheme that the structure of the steel-concrete adapter section of beam of the present invention is achieved is: comprise girder steel and concrete beam, the junction of described girder steel and described concrete beam is provided with bearing plate, and described girder steel comprises girder steel top board, girder steel base plate and steel beam web plate; Described concrete beam comprises the concrete web; Described girder steel is coated on the described concrete beam, thereby forms the changeover portion of a concrete beam to girder steel, and the steel beam web plate in the described changeover portion is inserted into the compound section that forms a steel-concrete in the concrete beam web; Be provided with the compartment of upper and lower two sealings of forming by lateral partitions between girder steel top board in described changeover portion and the girder steel base plate; Described bearing plate is a steel plate that fits like a glove with the cross section of girder steel; Between the girder steel top board and concrete beam in the described changeover portion, between girder steel base plate and the concrete beam, between steel beam web plate and the concrete beam web, be equipped with the shearing peg between bearing plate and the concrete beam; Be provided with prestressed strand and/or finish rolling deformed bar in the described concrete beam, described prestressed strand and/or finish rolling deformed bar are anchored on the bearing plate; Be respectively arranged with the U-shaped stiffening rib on described girder steel top board and the girder steel base plate, be welded with π shape stiffening rib on the described U-shaped stiffening rib respectively, the height of described π shape stiffening rib is to uprise gradually from girder steel side direction concrete beam side.
The steel-concrete adapter section structure of beam of the present invention, wherein an optimum implementation is, the slope of the lateral partitions of compartment is 1: 8～1: 15.
Compared with prior art, the invention has the beneficial effects as follows:
(1) adapter section is simple and practical, combine analysis and research from structure stress, structure requirement, easy construction and construction costs etc., propose and optimized simple and practical steel-concrete adapter section structure, the steel case beam section roof and floor thickness that is the steel-concrete adapter section increases, its top board and base plate longitudinal stiffener all adopt U type stiffening rib, on steel case back base plate U type stiffening rib π type stiffening rib is set, steel case web longitudinal stiffener adopts flat-bulb steel.Girder steel is connected the employing steel plate type with concrete beam, steel case beam and concrete box girder bonding surface place are provided with the pressure-bearing steel plate.Setting in 1: 8～1: 15 that the compartment inner formword is pressed slope is all welded WELDING STUDS in roof and floor, end board, closed compartment, and disposes prestress wire and/or the finish rolling deformed bar that is anchored on the end pressure-bearing steel plate.The present invention is provided with the π type stiffening rib of highly gradient on steel case back base plate U type stiffening rib, make its cross section property obtain slow variation, the variation of both sides, joint portion differing material properties, the different beam rigidity of having coincide, make adapter section more can transmit axle power, shearing, moment of flexure and distortion that various loads produce swimmingly, have good fatigue resistance and durability.
(2) adapter section is stressed clear and definite rationally all align with steel case beam by the appearance profile of concrete beam section and the centre of form, and is not only attractive in appearance but also be beneficial to the transmission of powerful power; Concrete thick section and π shape stiffening rib increase diffusion area, concentrate thereby avoided concrete beam stress to occur; π shape stiffening rib is a box structure, and self stability is good, and is antitorque and bending rigidity is bigger, plays an important role in the rigidity transition.And can adjust the section centre of form by its height and varied in thickness, to align with the concrete cross section centre of form.Steel-concrete adapter section structure of the present invention local stress level under various operating modes is lower, and adapter section is stressed clear and definite, and form of structure is reasonable.
(3) have certain social benefit and economic benefit, the present invention is in conjunction with the engineering experience of having built bridge of the same type both at home and abroad, its structure is carried out than choosing and particular design, effectively solve structure rigid-flexibility transition, axle power and problems such as shearing transfer mode, anti-cracking concrete and durability, strengthened safety, the reliability of steel reinforced concrete adapter section.The reliable connection of bridge has been guaranteed in the successful design of steel-concrete adapter section of the present invention, for the design of similar structures from now on provides reference and guidance, has very important realistic meaning.
To sum up, steel-concrete adapter section of the present invention can be widely used in various mixing beam bridges, comprises continuous girder bridge, cable stayed bridge, suspension bridge, arch bridge, can solve the difficult problem of steel-concrete adapter section processing and manufacturing complexity, constructing operation difficulty, fatigue resistance difference.For the design structure of similar structures from now on provides enough technical supports, has very important realistic meaning.
Description of drawings
Fig. 1 (a) shows the steel-concrete adapter section schematic diagram of four kinds of patterns in the prior art to Fig. 1 (d);
Fig. 2 is the schematic diagram of structure embodiment one of the steel-concrete adapter section of beam of the present invention;
Fig. 3 is that steel beam web plate and concrete web position concern schematic diagram among the present invention;
Fig. 4 is girder steel top board place U-shaped stiffening rib and a π shape stiffening rib schematic diagram among the present invention;
Fig. 5 is girder steel base plate place U-shaped stiffening rib and a π shape stiffening rib schematic diagram among the present invention;
Fig. 6 is the schematic diagram of structure embodiment two of the steel-concrete adapter section of beam of the present invention.
Among the figure:
1---girder steel 11---girder steel top board 12---girder steel base plate 13---steel beam web plate
14---lateral partitions 15---compartment 2---concrete beam 21---concrete webs
3---bearing plate 4---changeover portion 5---shearing peg 6---prestressed strands
7---U-shaped stiffening rib 8---π shape stiffening rib
The specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is done to describe in further detail.
Embodiment one:
As shown in Figure 2, the structure of the steel-concrete adapter section of beam of the present invention is to comprise girder steel 1 and concrete beam 2, and described girder steel 1 is provided with bearing plate 3 with the junction of described concrete beam 2, and described girder steel 1 comprises girder steel top board 11, girder steel base plate 12 and steel beam web plate 13; Described concrete beam 2 comprises concrete web 21; The section appearance profile of described girder steel 1 is consistent with the section appearance profile of described concrete beam 2, described girder steel 1 is coated on the described concrete beam 2, thereby form the changeover portion 4 of a concrete beam to girder steel, steel beam web plate 13 in the described changeover portion 4 is inserted into the compound section that forms a steel-concrete in the concrete beam web 21, as shown in Figure 3; Be provided with the compartment 15 of upper and lower two sealings of forming by lateral partitions 14 between girder steel top board 11 in described changeover portion 4 and the girder steel base plate 12, lateral partitions 14 be shown in horizontal direction among Fig. 2; Described bearing plate 3 is steel plates that fit like a glove with the cross section of girder steel 1; As shown in Figure 2, between the girder steel top board 11 and concrete beam 2 in the described changeover portion 4, between girder steel base plate 12 and the concrete beam 2, between steel beam web plate 13 and the concrete beam web 21, be equipped with shearing peg 5 between bearing plate 3 and the concrete beam 2; As shown in Figures 2 and 3, be provided with prestressed strand 6 and/or finish rolling deformed bar in the described concrete beam 2, described prestressed strand 6 and/or finish rolling deformed bar are anchored on the bearing plate 3, and described prestressed strand adopts steel strand.
As shown in Figure 4 and Figure 5, described girder steel top board 11 is provided with the U-shaped stiffening rib 7 of top board, described girder steel base plate 12 is provided with the U-shaped stiffening rib 7 of base plate, the U-shaped stiffening rib of described top board and the U-shaped stiffening rib 7 of described base plate are welded with π shape stiffening rib 8 on all, and π shape stiffening rib plays the increase diffusion area; Avoiding concrete beam stress to occur concentrates, described π shape stiffening rib is the box structure, self stability is good, antitorque and bending rigidity is bigger, in the rigidity transition, play an important role, and can adjust the section centre of form of girder steel by its height change, dwindle the difference of the girder steel section centre of form and the concrete beam section centre of form as far as possible, that is: the height of described π shape stiffening rib 8 is to uprise gradually from girder steel side direction concrete beam side, so that the rigidity that carries out the transition to the changeover portion of concrete material from steel matter obtains relaxing gradual change.
Embodiment two:
Present embodiment two is on the basis of the foregoing description one, the position of the lateral partitions of compartment is improved, that is, as shown in Figure 6, the slope of the lateral partitions 14 of compartment 15 is 1: 8～1: 15 between girder steel top board 11 in the present embodiment two in described changeover portion 4 and the girder steel base plate 12.As Fig. 3, Fig. 4 and shown in Figure 5, the structure of other parts is identical with enforcement one in the present embodiment two, does not repeat them here.
In sum, the structure of the steel-concrete adapter section of beam of the present invention compared with prior art, the thick integral plate of 60mm that the cross section of 3 employings of end board and girder steel fits like a glove, its rigidity is big, be out of shape for a short time, can guarantee effectively that axial force transmission evenly reaches the anchoring requirement of prestressed strand and/or finish rolling deformed bar; Set up enclosed compartment, its lateral partitions is a steel plate, on the steel plate shearing peg is set in the separation, thereby has increased shear strength, has in fact just increased the axial force transmission performance of beam; In addition, enclosed compartment more tends towards stability the stiffness variation of steel-concrete adapter section, show by stress studies, the lateral partitions of closed compartment adopts 1: 8～1: 15 slope among the present invention, form long and narrow closed compartment, make that the transmission of axle power is more smooth and easy, therefore, the slope that lateral partitions adopted 1: 8～1: 15 is a most preferred embodiment of the present invention; Among the present invention, in bearing plate, steel beam web plate and closed compartment, be provided with the shearing peg, improved the shear strength of adapter section; Powerful prestressed strand and finish rolling deformed bar are used, can resist the moment of flexure that mobile load produces effectively, increase the quantity of shearing peg, shearing peg and concrete joint surface are increased, the anti-cracking concrete ability is improved, and reliability of structure significantly strengthens.
Although top invention has been described in conjunction with figure; but the present invention is not limited to the above-mentioned specific embodiment; the above-mentioned specific embodiment only is schematic; rather than it is restrictive; those of ordinary skill in the art is under enlightenment of the present invention; under the situation that does not break away from aim of the present invention, can also make a lot of distortion, these all belong within the protection of the present invention.
Claims (3)
1. the structure of the steel-concrete adapter section of a beam, comprise girder steel (1) and concrete beam (2), described girder steel (1) is provided with bearing plate (3) with the junction of described concrete beam (2), and described girder steel (1) comprises girder steel top board (11), girder steel base plate (12) and steel beam web plate (13); Described concrete beam (2) comprises concrete web (21); It is characterized in that:
Described girder steel (1) is coated on the described concrete beam (2), thereby forms the changeover portion (4) of a concrete beam to girder steel, and the steel beam web plate (13) in the described changeover portion (4) is inserted into the compound section that forms a steel-concrete in the concrete beam web (21);
Be positioned at the compartment (15) that is provided with upper and lower two sealings of forming by lateral partitions (14) between the girder steel top board (11) of described changeover portion (4) and the girder steel base plate (12);
Described bearing plate (3) is a steel plate that fits like a glove with the cross section of girder steel (1);
Between the girder steel top board (11) and concrete beam (2) in the described changeover portion (4), between girder steel base plate (12) and the concrete beam (2), between steel beam web plate (13) and the concrete beam web (21), be equipped with shearing peg (5) between bearing plate (3) and the concrete beam (2);
Be provided with prestressed strand (6) and/or finish rolling deformed bar in the described concrete beam (2), described prestressed strand (6) and/or finish rolling deformed bar are anchored on the bearing plate (3);
Be respectively arranged with U-shaped stiffening rib (7) on described girder steel top board (11) and the girder steel base plate (12), be welded with π shape stiffening rib (8) on the described U-shaped stiffening rib (7) respectively, the height of described π shape stiffening rib (8) is to uprise gradually from girder steel side direction concrete beam side.
2. according to the structure of the steel-concrete adapter section of the described beam of claim 1, it is characterized in that: the appearance profile of described concrete beam section is consistent with the appearance profile of described girder steel section.
3. according to the structure of the steel-concrete adapter section of the described beam of claim 1, it is characterized in that: the slope of the lateral partitions (14) of compartment (15) is 1: 8～1: 15.
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