CN103437278A - Variable-section U-shaped reinforcing rib structure of steel box girder roof of bridge - Google Patents
Variable-section U-shaped reinforcing rib structure of steel box girder roof of bridge Download PDFInfo
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- CN103437278A CN103437278A CN2013103136884A CN201310313688A CN103437278A CN 103437278 A CN103437278 A CN 103437278A CN 2013103136884 A CN2013103136884 A CN 2013103136884A CN 201310313688 A CN201310313688 A CN 201310313688A CN 103437278 A CN103437278 A CN 103437278A
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Abstract
The invention discloses a variable-section U-shaped reinforcing rib structure of a steel box girder roof of a bridge. The variable-section U-shaped reinforcing rib structure comprises a steel box girder roof and a U-shaped reinforcing rib, wherein the U-shaped reinforcing rib consists of a U-shaped web plate and a bottom plate; an open end of the U-shaped web plate is welded with the steel box girder roof; the welded U-shaped web plate has a closed structure; a part of the U-shaped web plate close to one end of the bottom plate is an equal-thickness web plate body with equal wall thickness; a part of the U-shaped web plate close to one end of the steel box girder roof is a variable-thickness web plate body with unequal wall thickness; the wall thickness of the variable-thickness web plate body is greater than the wall thickness of the equal-thickness web plate body; the wall thickness of the variable-thickness web plate body is gradually increased along the direction from the bottom plate to the steel box girder roof; the wall thickness value on a welding part welded with the steel box girder roof reaches the maximum value; the variable-thickness web plate body can guarantee that the thickness of a weld penetration part during welding of the U-shaped web plate and the steel box girder roof is basically equal to the wall thickness of the equal-thickness web plate body, so that additional bending moment caused by eccentricity on the welding part is reduced and the fatigue resistance of the structure is improved.
Description
Technical field
The present invention relates to the bridge construction structure, specifically refer to the U-shaped stiffening rib structure of a kind of bridge steel box girder top board variable cross-section.
Background technology
Since reform and opening-up, the highway construction cause fast development of China, bridge has also obtained corresponding development as the important component part of highway construction, and the advantage such as orthotropic plate is lightweight owing to having, supporting capacity is large is widely used in the construction of steel bridge.But, under the impact of transfiniting in the rapid growth that in recent years is subject to traffic and overload, in the built steel bridge of China, there is fatigue crack in various degree the junction that the part Orthotropic Steel Bridge Deck has been observed vertical rib and bridge deck.Although the total structure of steel bridge deck is substantially identical, the local structure details such as vertical rib form, vertical rib and being connected of cross rib are still distinguished to some extent, for this reason, work out rational longitudinal system, have great importance.
The longitudinal stiffener of modern Orthotropic Steel Bridge Deck has two types: open ribs, the rib of remaining silent; Research on Open Stiffener cross section principal mode has I shaped steel, T-steel, angle steel, flat-bulb steel etc., and the stiffening rib cross section principal mode of remaining silent has rectangle, V-type and U-shaped etc.Because the stiffening rib of remaining silent can provide larger torsional rigidity and bending rigidity, can improve the stress of whole bridge surface armor plate, reduce the stress of steel plate, therefore become the stiffening rib section form of modern orthotropic plate first-selection, the most frequently used section form is closed U-shaped stiffening rib at present.
In prior art, the common U-shaped stiffening rib of uniform section as shown in Figure 1 to Figure 3, comprise steel case back plate 1 and U-shaped stiffening rib, U-shaped stiffening rib is comprised of U-shaped web 2 and the base plate 3 of one cast molding, the openend of U-shaped web 2 welds mutually with steel case back plate 1, U-shaped web 2 after welding is enclosed construction, and U-shaped web 2 integral body are the uniform thickness web body that wall thickness is equal, and wall thickness T 1 is generally 8mm, weld seam 4 can only reach 6～7mm usually, the remaining approximately incomplete fusion part of 1～2mm.
Yet the U-shaped stiffening rib of above-mentioned uniform section occurs much about the reports of tired disease at recent domestic, the design life that causes fatigue life of steel bridge deck to require much smaller than bridge main body.Experience shows, in the U-shaped stiffening rib of above-mentioned uniform section, the crack quantity of steel case back plate and U rib commissure is many, harm is large, repair difficulty, produce the reason of this fatigue crack: the one, because U-shaped stiffening rib is the structure of remaining silent, the U rib can only be from outside single face welding, generally adopt 75～85% partial penetration weldering, stay 15～25% incomplete fusion part, about 1～2mm, the incomplete fusion part of this 1～2mm itself forms a natural initial crack, become the fatigue crack source, under the wheel load repeated action, cause the easy fatigue cracking of top board and U rib commissure; The top board weld seam part of the 2nd, U rib is compared its thickness of section and is reduced by 1～2mm with the non-welding position of U rib, sectional area reduces, and causes junction that certain bias is arranged, and it is concentrated that this place's bias can cause additional bending moment to form stress, thus created fractures.After fatigue crack produces, will reduce bridge deck rigidity and directly cause deck paving to damage, and mat formation conversely and damage the crack progressing that also aggravates bridge deck, and aggravate the minimizing of fatigue life, domestic a lot of steel box girder bridge floor pavings often maintenance are exactly this problem.
Summary of the invention
The purpose of this invention is to provide the U-shaped stiffening rib structure of a kind of bridge steel box girder top board variable cross-section, at U rib and panel connecting portion, suitably thicken, part becomes variable cross-section, make welding penetration segment thickness suitable with the U rib thickness, minimizing is because of the eccentric additional bending moment produced in this place, reduce Fatigue Stress Amplitude, improve fatigue strength.
Above-mentioned purpose of the present invention realizes by following technical solution: the U-shaped stiffening rib structure of a kind of bridge steel box girder top board variable cross-section, comprise steel case back plate and U-shaped stiffening rib, U-shaped stiffening rib is comprised of integrated U-shaped web and base plate, the openend of U-shaped web welds mutually with described steel case back plate, U-shaped web after welding is enclosed construction, described U-shaped web is the uniform thickness web body that wall thickness is equal at the position near base plate one end, it is characterized in that: described U-shaped web is at the thickening web body that near the position of steel case back plate one end is the variable cross-section that do not wait of wall thickness, the wall thickness of described thickening web body is greater than the wall thickness of described uniform thickness web body, and the wall thickness of thickening web body is along the direction progressive additive to steel case back plate from base plate, wall thickness value in the welding position welded mutually with steel case back plate reaches maximum value, the thickness of welding penetration part when described thickening web body can guarantee that U-shaped web welds mutually with steel case back plate equates substantially with the wall thickness of uniform thickness web body, minimizing is because of the eccentric additional bending moment produced of weld, to improve the fatigue resistance of structural entity.
The U-shaped stiffening rib to traditional of the U-shaped stiffening rib structure of variable cross-section of the present invention is constructed improvement, at U-shaped stiffening rib and bridge deck connecting portion, suitably thickeies, and is about to its part and changes variable cross-section into, then it is carried out to groove welding.In the present invention, 1.2～1.3 times of the wall thickness value that the wall thickness value of described thickening web body in the welding position welded mutually with steel case back plate is uniform thickness web body.
In the present invention, the height of described thickening web body is in 20～30mm scope.
In the present invention, described U-shaped web and the cast molding of base plate one.
In the present invention, described thickening web body is that inwall thickens with respect to the mode that thickens of uniform thickness web body, be that the trend of the external wall of described thickening web and the trend of the external wall of uniform thickness web coincide, the inwall of described thickening web body is thickeied with respect to the inwall of uniform thickness web body.
With traditional U rib scheme, compare, the U-shaped stiffening rib structure of variable cross-section of the present invention, by the groove welding between local variable cross-section and bridge floor top board, make welding penetration thickness suitable with U-shaped stiffening rib thickness.After having solved traditional U-shaped stiffening rib and top board welding, and cause the defects such as the weakening of cross section, commissure and power transmission bias, reduced the stress caused because of additional bending moment to concentrate, reduced Fatigue Stress Amplitude, improve fatigue strength, improved the durability of deck paving, reduced the maintenance cost in later stage.
The accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is the elevation of steel case beam in prior art;
Fig. 2 be the A of Fig. 1 to enlarged drawing, show the U-shaped stiffening rib structure of uniform section of the prior art;
Fig. 3 be the B of Fig. 2 to enlarged drawing, show the U-shaped stiffening rib structure of uniform section of the prior art;
Fig. 4 is the elevation of steel case beam in the present invention;
Fig. 5 be the C of Fig. 4 to enlarged drawing, show the U-shaped stiffening rib structure of variable cross-section in the present invention;
Fig. 6 be the D of Fig. 5 to enlarged drawing, show the U-shaped stiffening rib structure of variable cross-section in the present invention.
Description of reference numerals
1, steel case back plate; 2, U-shaped web; 21, uniform thickness web body;
22, thickening web body; 3, base plate; 4, weld seam;
The specific embodiment
The U-shaped stiffening rib structure of a kind of bridge steel box girder top board variable cross-section as shown in Figures 4 to 6, comprise steel case back plate 1 and U-shaped stiffening rib, U-shaped stiffening rib is comprised of U-shaped web 2 and the base plate 3 of one cast molding, the openend of U-shaped web 2 welds mutually with steel case back plate 1, U-shaped web 2 after welding is enclosed construction, U-shaped web 2 is the uniform thickness web body 21 that wall thickness is equal at the position near base plate 3 one ends, U-shaped web 2 is at the thickening web body 22 that near the position of steel case back plate 1 one ends is the variable cross-section that do not wait of wall thickness, the wall thickness of thickening web body 22 is greater than the wall thickness of uniform thickness web body 21, and the wall thickness of thickening web body 22 is along the direction progressive additive to steel case back plate 1 from base plate 3, wall thickness value in the welding position welded mutually with steel case back plate 1 reaches maximum value, thickening web body 22 is 10mm at the wall thickness value T2 of the welding position welded mutually with steel case back plate 1, the wall thickness value T1 of uniform thickness web body 21 is 8mm, wall thickness value T2 is 1.25 times of T1, the height H of thickening web body 22 is 24mm, be that U-shaped web 2 is highly thickeied for the position wall thickness of 24mm at distance steel case back plate 1, the thickness of welding penetration part when this thickening web body 22 can guarantee that U-shaped web 2 welds mutually with steel case back plate 1 equates substantially with the wall thickness value T1 of uniform thickness web body 21, guarantee that weld seam 4 can reach the thickness of 8mm, the thickness that is weld seam 4 equates substantially with the thickness of wall thickness value T1, reduce thus because of the eccentric additional bending moment produced of weld, to improve the fatigue resistance of structural entity, solved throat depth in the U-shaped stiffening rib one side welding of traditional uniform section be less than U-shaped stiffening rib thickness 15～25% and the various defects that cause, avoided the generation of fatigue crack from source.
In the present embodiment, thickening web body 22 is that inwall thickens with respect to the mode that thickens of uniform thickness web body 21, be that the trend of thickening web body 22 outer walls and the trend of uniform thickness web body 21 outer walls coincide, the inwall of thickening web body 22 is thickeied with respect to the inwall of uniform thickness web body 21.
As the conversion of the present embodiment, 1.2～1.3 times of the wall thickness value T1 that the wall thickness value T2 of thickening web body 22 in the welding position welded mutually with steel case back plate 1 is uniform thickness web body 21.
As the conversion of the present embodiment, the height H of thickening web body 22 is in 20～30mm scope.
Manufacturing process of the present invention is as follows: the mould that at first is prefabricated in the factory adds the thickness of section of large U type stiffening rib and top board welding position on the mold foundation of the U-shaped stiffening rib of tradition.Secondly manufacture the U-shaped stiffening rib of hot rolling variable cross-section according to mould.The 3rd, the U-shaped stiffening rib of variable cross-section and bridge deck are carried out to groove welding, jointly formed Orthotropic Steel Bridge Deck.
The above embodiment of the present invention is not limiting the scope of the present invention; embodiments of the present invention are not limited to this; all this kind is according to foregoing of the present invention; ordinary skill knowledge and customary means according to this area; do not breaking away under the above-mentioned fundamental technics thought of the present invention prerequisite; the modification of other various ways that said structure of the present invention is made, replacement or change, within all should dropping on protection scope of the present invention.
Claims (5)
1. the U-shaped stiffening rib structure of bridge steel box girder top board variable cross-section, comprise steel case back plate (1) and U-shaped stiffening rib, U-shaped stiffening rib is comprised of integrated U-shaped web (2) and base plate (3), the openend of U-shaped web (2) welds mutually with described steel case back plate (1), U-shaped web (2) after welding is enclosed construction, described U-shaped web (2) is the uniform thickness web body (21) that wall thickness is equal at the position near base plate (3) one ends, it is characterized in that: described U-shaped web (2) is at the thickening web body (22) that near the position of steel case back plate (1) one end is the variable cross-section that do not wait of wall thickness, the wall thickness of described thickening web body (22) is greater than the wall thickness of described uniform thickness web body (21), and the wall thickness of thickening web body (22) is along the direction progressive additive to steel case back plate (1) from base plate (3), wall thickness value in the welding position welded mutually with steel case back plate (1) reaches maximum value, described thickening web body (22) can guarantee that the thickness of U-shaped web (2) part of the welding penetration while welding mutually with steel case back plate (1) equates substantially with the wall thickness of uniform thickness web body (21), minimizing is because of the eccentric additional bending moment produced of weld, to improve the fatigue resistance of structural entity.
2. the U-shaped stiffening rib structure of bridge steel box girder top board variable cross-section according to claim 1 is characterized in that: 1.2～1.3 times of the wall thickness value that the wall thickness value of described thickening web body (22) in the welding position welded mutually with steel case back plate (1) is uniform thickness web body (21).
3. the U-shaped stiffening rib structure of bridge steel box girder top board variable cross-section according to claim 2, it is characterized in that: the height of described thickening web body (22) is in 20～30mm scope.
4. the U-shaped stiffening rib structure of bridge steel box girder top board variable cross-section according to claim 1, is characterized in that: described U-shaped web (2) and base plate (3) one cast molding.
5. according to the U-shaped stiffening rib structure of the described bridge steel box girder top board of claim 1 to 4 any one variable cross-section, it is characterized in that: described thickening web body (22) is that inwall thickens with respect to the mode that thickens of uniform thickness web body (21), be that the trend of described thickening web body (22) outer wall and the trend of uniform thickness web body (21) outer wall coincide, the inwall of described thickening web body (22) is thickeied with respect to the inwall of uniform thickness web body (21).
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| CN2013103136884A CN103437278A (en) | 2013-07-24 | 2013-07-24 | Variable-section U-shaped reinforcing rib structure of steel box girder roof of bridge |
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| CN2013103136884A CN103437278A (en) | 2013-07-24 | 2013-07-24 | Variable-section U-shaped reinforcing rib structure of steel box girder roof of bridge |
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Cited By (6)
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| CN104625654A (en) * | 2015-02-12 | 2015-05-20 | 南京天润型钢有限公司 | Production method for unequal thickness U rib formation |
| CN104942104A (en) * | 2015-05-05 | 2015-09-30 | 北京科技大学 | Thermal roll-forming process of unequal-thickness U-ribs |
| WO2017210950A1 (en) * | 2016-06-08 | 2017-12-14 | 卢国林 | Novel bridge structure utilizing connected-plate truss |
| CN113356051A (en) * | 2021-07-16 | 2021-09-07 | 辽宁工程技术大学 | Horizontal prestressing force U rib steel bridge floor plate structure |
| CN113606058A (en) * | 2021-07-01 | 2021-11-05 | 西安航天动力研究所 | Force transmission device of boosting rocket |
| CN114753233A (en) * | 2022-05-31 | 2022-07-15 | 浙江中隧桥波形钢腹板有限公司 | Corner variable-thickness reinforced stiffening rib, manufacturing method thereof and bridge deck structure |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104625654A (en) * | 2015-02-12 | 2015-05-20 | 南京天润型钢有限公司 | Production method for unequal thickness U rib formation |
| CN104942104A (en) * | 2015-05-05 | 2015-09-30 | 北京科技大学 | Thermal roll-forming process of unequal-thickness U-ribs |
| WO2017210950A1 (en) * | 2016-06-08 | 2017-12-14 | 卢国林 | Novel bridge structure utilizing connected-plate truss |
| CN113606058A (en) * | 2021-07-01 | 2021-11-05 | 西安航天动力研究所 | Force transmission device of boosting rocket |
| CN113606058B (en) * | 2021-07-01 | 2022-08-23 | 西安航天动力研究所 | Force transmission device of boosting rocket |
| CN113356051A (en) * | 2021-07-16 | 2021-09-07 | 辽宁工程技术大学 | Horizontal prestressing force U rib steel bridge floor plate structure |
| CN113356051B (en) * | 2021-07-16 | 2023-02-24 | 辽宁工程技术大学 | Horizontal prestressing force U rib steel bridge floor plate structure |
| CN114753233A (en) * | 2022-05-31 | 2022-07-15 | 浙江中隧桥波形钢腹板有限公司 | Corner variable-thickness reinforced stiffening rib, manufacturing method thereof and bridge deck structure |
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