CN103388376A - Corrugated steel web beam structure for improving fatigue resistance strength - Google Patents
Corrugated steel web beam structure for improving fatigue resistance strength Download PDFInfo
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- CN103388376A CN103388376A CN2013103690061A CN201310369006A CN103388376A CN 103388376 A CN103388376 A CN 103388376A CN 2013103690061 A CN2013103690061 A CN 2013103690061A CN 201310369006 A CN201310369006 A CN 201310369006A CN 103388376 A CN103388376 A CN 103388376A
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Abstract
The invention discloses a corrugated steel web beam structure for improving the fatigue resistance strength. The corrugated steel web beam structure for improving the fatigue resistance strength comprises two flange plates (2) as well as a corrugated web (1) arranged between the two flange plates (2); the outer side of at least one flange plate (2) is provided with a reinforcing plate (3); the projection of the reinforcing plates (3) on the flange plates (2) is corrugated. Due to the adoption of the structure, the stress concentration close to a transition part of the oblique section and the straight section of the corrugated web for steel beam flange plates can be relieved effectively, and the fatigue resistance strength of a corrugated steel web beam can be improved.
Description
Technical field
The present invention relates to building and bridge construction field, specifically a kind of Wavelike steel webplate girder construction that improves fatigue resistance.
Background technology
The welding Wavelike steel webplate beam that is used for building and bridge under arms the cycle usually bear the alternation cyclic reverse loading, be necessary the fatigue safety of Wavelike steel webplate and girder steel frange plate connecting portion is taken into full account.The Wavelike steel webplate girder steel mainly is welded by corrugated sheet steel and girder steel frange plate.Because Wavelike steel webplate has higher shear buckling intensity, and have the free-extension characteristics that are similar to accordion effect under the longitudinal tensile metamorphosis, so planar the tensile stress that produces of moment of flexure is mainly born by the girder steel frange plate.Textural, the tilting section of Wavelike steel webplate and the direction of longitudinal tension stress are certain angle of cut, make the stress that transmits on the steel frange plate flow to this and are subject to certain obstruction, should locate again simultaneously neighbour attachment weld zone, cause thus stress raisers.When this angle of cut was larger, the stress in zone was concentrated more outstanding between Wavelike steel webplate tilting section and girder steel frange plate edge, more easily forms the structural fatigue weak part, causes too early generation fatigue failure.
In the application of steel-mixed compound beam, web is connected with concrete up and down bridge deck, and its connecting portion is most important tectonic position, and good capacity transfer function horizontal shear and the opposing moment of flexure vertical with longitudinal direction longitudinally be arranged, to guarantee compound beam safety.Flange-shaped shear connector can provide preferably supporting capacity with opposing transverse bending moment and longitudinal shear effect, in steel-concrete composite beam by more employing.As Patent Office of the People's Republic of China in the invention of application number 201020185948.6 denominations of invention " a kind of shear connector " of 2010.12.15 bulletin, adopt directly perforate on Wavelike steel webplate and on corrugated sheet steel the welded flange plate form.But the Fatigue Test Research of recent domestic is found, still easily produce fatigue cracking on the tension girder steel frange plate that links with Wavelike steel webplate and affected the fatigue strength of compound beam, and existing method is mainly to guarantee the static(al) security intensity, but does not more relate to the fatigue behaviour problem of beam.
Experience shows, due to stress, concentrates and causes fatigue crack after germinating on the girder steel frange plate that links with web, causes the fatigue cracking at attachment weld place under alternate stress (as: wheel load) effect, and harm is large and repair difficulty.In addition, when the welding of processing and fabricating,, if there is local incomplete fusion part in welding itself, often easily forms natural initial crack and develop into formation of crack, the aggravation fatigue cracking.
Summary of the invention
The invention provides a kind of Wavelike steel webplate girder construction that improves fatigue resistance, for the larger situation of the Wavelike steel webplate tilting section angle of cut, the frange plate that has solved Wavelike steel webplate beam in the past occurs easily that at the corrugated web tilting section and with near the attachment weld place the intermediate location of flat segments stress concentrates, and causing fatigue cracking, harm is large and repair difficult; Simultaneously, there is local incomplete fusion part in welding itself, often easily forms natural initial crack and develops into formation of crack, and local outstanding stress is concentrated the problem that causes the fatigue cracking aggravation.
The present invention is that the technical solution problem is achieved through the following technical solutions: a kind of Wavelike steel webplate girder construction that improves fatigue resistance, comprise two blocks of frange plates and be arranged on two corrugated webs between frange plate, corrugated web comprises vertical flat segments and tilting section, the outside of described at least one block of frange plate is provided with stiffener, and described stiffener is projected as waveform on frange plate.planar under Moment, often the bottom wing listrium with girder steel bears tensile stress, and girder steel frange plate upper stress concentrate the position multidigit in the corrugated web tilting section and with the intermediate location of flat segments near, thereby easily cause fatigue failure to occur in these zones, after increasing stiffener, when tensile stress stream transmits on girder steel tension frange plate, Wavelike steel webplate and stiffener can carry out layer to shunting to the tensile stress stream in the tension frange plate preferably, thereby well alleviating the girder steel frange plate concentrates at the tilting section of Wavelike steel webplate and with near the stress the intermediate location of flat segments, generally, corrugated web is that weld seam is connected with the frange plate employing, can form weld seam on frange plate, stiffener also can be connected by weld seam with frange plate, connected mode can be that the angle seam welding can be also the butt joint welding, can the employing welding manner identical with the welding of corrugated web and frange plate.
Further, described stiffener is perpendicular to frange plate.Stiffener perpendicular to frange plate after, can realize better that the tensile stress layer is to shunting.
Further, described stiffener is positioned on same coordinate axes in the projection on frange plate in the projection on frange plate and corrugated web, and differs 1/2 wavelength.Stiffener becomes reverse symmetry with corrugated web, i.e. the trough of the corresponding corrugated web of the crest of stiffener, and the crest of the corresponding corrugated web of the trough of stiffener, and the tensile stress shunting effect of this moment is better.
Further, also comprise some WELDING STUDS, described WELDING STUDS laterally runs through stiffener.When this part applied to the steel-concrete combination beam structure, the effect of WELDING STUDS and perforated rebar was to make the stiffener of embedding can better resist horizontal shear, improved the crack resistance of concrete slab, improved the durability of structure.
Further, described WELDING STUDS is fixed by melting welding or the mode and the stiffener that penetrate weldering.
Penetrate weldering and refer to that peg (weldering nail) is welded on workpiece (girder steel) by " galvanized sheet ", and with galvanized sheet, fuse into one.Mainly contain two kinds of methods: 1. first beat (punching) hole in the welding position of galvanized sheet, and then with welding of peg on workpiece, the advantage of this method is that welding quality easily is guaranteed; 2, with electric arc, galvanized sheet is burnt, then with welding of peg on workpiece, the advantage of this method is that galvanized sheet perforation and welding of peg accomplish without any letup, and simply saves time.
For melting welding, be not burn as prerequisite take through welding.In welding process, more than peg connection place weldment is heated to fusing point, melt simultaneously welding rod, the welding method of completing to molten state, can form firmly welding point.Because welded piece closely sticks together, under the effect of thermal field, gravity etc., plus-pressure not, the melting liquid mixing phenomena can occur of two workpiece fusings, have the thermal efficiency high, be subjected to the advantages such as extraneous weather influence is little, speed of welding is fast.
Further, described WELDING STUDS is through the flat segments of stiffener, and WELDING STUDS is vertical with the flat segments of stiffener.Due to the WELDING STUDS through the stiffener flat segments and edge of a wing longitudinal tension stress perpendicular direction, the effect of its opposing shearing of performance that can larger limit.Simultaneously, at the stiffener tilting section, WELDING STUDS is not set, can avoid leaning on too closely with vertical perforated rebar, and the structure that causes is difficult.
Further, also comprise some perforated rebars, described perforated rebar is vertically through the tilting section of stiffener, and perforated rebar is vertical with WELDING STUDS.
Further, arc transition is adopted at tilting section and the handing-over of the corner between the flat segments position of described Wavelike steel webplate and corresponding stiffener, and the radius of curvature of this circular arc is equal to or greater than half of parallel distance between two adjacent flat segments.In this programme between said two adjacent flat segments parallel distance be the peak-to-peak value of corrugated web or stiffener place waveform, i.e. the absolute value sum of positive negative peak,.
Further, described stiffener is provided with breach, and this indentation, there is connected with transiting arc plate, and the described arc plate place radius of a circle that crosses is equal to or greater than 150mm.Be subjected to the impact of structure, the suffered tensile stress of frange plate of different sections varies in size, be that some regional frange plate need to arrange stiffener, the frange plate in other zone need not to arrange stiffener, in order to make two zones that certain transition be arranged, transiting arc plate is set, the direction that arranges has certain being particular about, preferably transiting arc plate is arranged on along longitudinal tension stress direction (the longitudinal length direction of beam, namely the direction vertical with the beam cross section), avoid causing unnecessary stress to concentrate due to the obstruction of transiting arc plate to steel frange plate upper stress stream; The setting of transiting arc plate is to make transition of stress mild in addition, avoid stress to concentrate, and the too small meeting of radius makes this transition can not get bringing into play preferably, causes on the contrary unnecessary stress to concentrate; The material of transiting arc plate can be consistent with the material of stiffener.
Further, the frange plate place that the waveform corner of described corrugated web or stiffener is corresponding adopts bead.Bead also claims shot peening strengthening, is to reduce part fatigue, improves one of the effective ways in life-span.
The present invention compared with prior art has the following advantages and beneficial effect:
(1) the present invention becomes antisymmetric waveform stiffener by arranging with Wavelike steel webplate, effectively having alleviated the girder steel frange plate concentrates at the corrugated web tilting section and with near the stress the intermediate location of flat segments, thus, effectively improved the fatigue resistance of Wavelike steel webplate beam.
(2) the present invention arranges WELDING STUDS on stiffener, thereby strengthened the resistivity of horizontal shear in the concrete frange plate, met the requirement of horizontal shear in opposing concrete frange plate, increase again perforated rebar longitudinally, form the steel concrete shear-pin together with WELDING STUDS, further strengthen the opposing to horizontal shear.
While (3) being prefabricated in the factory, can employing material and the mode identical with Wavelike steel webplate and attachment weld thereof make the waveform stiffener, make easy to process; And when existing Wavelike steel webplate beam is transformed, can carry out being the setting of antisymmetric waveform stiffener with Wavelike steel webplate in the girder steel tension frange plate outside of corresponding site, the structure construction transformation is easy.
(4) the present invention makes the waveform stiffener be the antisymmetry layout along the wide center line of girder steel tension frange plate, can reduce preferably the tension frange plate produces after welding single face corrugated sheet bird caging and distortion.
(5) technical scheme designability of the present invention and good economy performance, adapt to span carried out the segmentation transformation than the tired rapid wear section of crossbeam, also can carry out local antifatigue to existing Wavelike steel webplate girder construction and strengthen.
Description of drawings
Fig. 1 is the overall structure schematic diagram of embodiments of the invention 1;
Fig. 2 is the structural representation of the stiffener of embodiments of the invention 1;
Fig. 3 is the overall structure schematic diagram of embodiments of the invention 6;
Fig. 4 is the overall structure schematic diagram of embodiments of the invention 8;
Fig. 5 be the tension stress zone of Wavelike steel webplate girder construction before structure improves with improvement after the fatigue data comparison diagram.
The specific embodiment
The present invention is described in further detail below in conjunction with embodiment, but embodiments of the present invention are not limited to this.
Embodiment 1:
as Fig. 1, shown in Figure 2, the present embodiment comprises two blocks of frange plates 2 and is arranged on two corrugated webs 1 between frange plate 2, the outside of at least one block of frange plate 2 is provided with stiffener 3, realize being connected by weld seam 4 between stiffener 3 and frange plate 2, stiffener 3 is projected as waveform on frange plate 2, because the tensile stress that moment-in-plane produces is mainly born by frange plate 2, often only have a side of frange plate 2 can be subject to tensile stress, and opposite side is extruding force, therefore only stiffener 3 is arranged on a side of frange plate 2 tension stress, stressed by corrugated web 1 and stiffener 3, can realize the shunting of tensile stress, it is the situation that not there will be stress to concentrate on frange plate 2, thereby can effectively improve the fatigue resistance of Wavelike steel webplate beam.In addition,, if the frange plate 2 equal tension stress in both sides all arrange stiffener 3 in the outside of two blocks of frange plates 2, reach the tensile stress of shunting simultaneously both sides.
Embodiment 2:
The present embodiment on the basis of embodiment 1, makes stiffener 3 perpendicular to frange plate 2, improves the tensile stress shunting effect on 3 pairs of frange plates 2 of stiffener.
Embodiment 3:
The present embodiment is on the basis of embodiment 2, stiffener 3 is positioned on same coordinate axes in the projection on frange plate 2 in the projection on frange plate 2 and corrugated web 1, and differ 1/2 wavelength, two projections differ half wavelength, just make the trough of the corresponding corrugated web 1 of crest of stiffener 3, the crest of the corresponding corrugated web 1 of the trough of stiffener 3,3 one-tenth antisymmetry of corrugated web 1 and stiffener, can shunt tensile stress better, alleviate the girder steel frange plate and concentrate at the corrugated web tilting section and with near the stress the intermediate location of flat segments.
Embodiment 4:
The present embodiment makes further improvements on the basis of embodiment 3,, in order to strengthen the resistivity of horizontal shear in the concrete frange plate, increase some WELDING STUDS 5 on stiffener 3, and WELDING STUDS 5 laterally runs through stiffener 3.
Embodiment 5:
The present embodiment, at the basic enterprising one-step optimization of embodiment 4, is specially: make WELDING STUDS 5 by melting welding or penetrate the mode of weldering and stiffener 3 fixing, WELDING STUDS 5 is through the flat segments of stiffener 3, and vertical with flat segments; In addition, also can perforate on stiffener 3, the shape in hole can be the shapes such as unitary circular, opening be circular, oval, trapezoidal, and then WELDING STUDS 5 is passed hole, forms the steel concrete shear-pin with the larger horizontal shear of opposing together with concrete.
Embodiment 6:
As shown in Figure 3, the present embodiment increases some perforated rebars 6 on the basis of embodiment 5, the vertical tilting section through stiffener 3 of perforated rebar 6, concrete operations are: in the tilting section perforate of corrugated web 1 and wear vertical perforated rebar 6, with the resistivity of enhancing with the direction moment of flexure that vertically meets at right angles, vertically the quantity of perforated rebar 6 and arrangement can be adjusted according to concrete requirement.
Embodiment 7:
The present embodiment improves on the basis of embodiment 6, make perforated rebar 6 vertical with WELDING STUDS 5, to guarantee to strengthen the horizontal and vertical resistance of frange plate 2.
Embodiment 8:
As shown in Figure 4, the present embodiment is being provided with breach on the basis of embodiment 7 on stiffener 3, this breach is namely that the stiffener of original whole piece 3 is interrupted formation, and two sections stiffeners 3 that then by transiting arc plate 7, will disconnect couple together, and crosses arc plate 7 place radius of a circles and is equal to or greater than 150mm.Thus, for the larger situation of beam span, can only to the tired rapid wear section of Wavelike steel webplate beam, carry out the structure improvement of fatigue strength raising, namely on the frange plate 2 of the tired vulnerable zone of correspondence, stiffener 3 is set, do not need the place of strengthening by transiting arc plate 7, to carry out transition, make structural design scheme can meet the economy requirement simultaneously.
Embodiment 9:
Except above embodiment, vertical flat segments by enlarging corrugated web 1 and stiffener 3 and tilting section are at the arc radius of waveform rotation angle position, also help to improve fatigue life, the stress that is reduced in this position is concentrated, and arc radius can be extended to the maximum value by the restriction of waveform tilting section.
Embodiment 10:
In addition, adopt bead to provide suitable surfacing to surface outside circular arc-shaped corner intermediate location in waveform of girder steel frange plate, further improve the fatigue strength that is welded to connect, secondly, also increased local surfaces hardness, as preferably, bead is applied to the beginning of waveform tilting section and stops position, coordinates like this present invention to improve structure and makes the girder steel frange plate more even along the stress distribution of corrugated web.
As shown in Figure 5, can see by Data Comparison, after employing standard welding method is improved with structure, the waveform tilting section angle of cut is the difference of node on fatigue strength of 60 degree, by with the tired codes and standards curve comparison of AASHTO LRFD, can find, the present invention constructs fatigue data after improvement from more than rising to the B level below the B level, has obviously improved fatigue resistance.
The present invention is illustrated by above-described embodiment, but should be understood that, above-described embodiment just is used for for example and the purpose of explanation, but not is intended to the present invention is limited in described scope of embodiments.In addition, it will be appreciated by persons skilled in the art that the present invention is not limited to above-described embodiment, according to instruction of the present invention, can also make more kinds of variants and modifications, these variants and modifications all drop in the present invention's scope required for protection.
Claims (10)
1. Wavelike steel webplate girder construction that improves fatigue resistance, comprise two blocks of frange plates (2) and be arranged on corrugated web (1) between two blocks of frange plates (2), corrugated web (1) comprises vertical flat segments and tilting section, it is characterized in that: the outside of described at least one block of frange plate (2) is provided with stiffener (3), and described stiffener (3) is projected as waveform on frange plate (2).
2. a kind of Wavelike steel webplate girder construction that improves fatigue resistance according to claim 1, it is characterized in that: described stiffener (3) is perpendicular to frange plate (2).
3. a kind of Wavelike steel webplate girder construction that improves fatigue resistance according to claim 1, it is characterized in that: the projection on frange plate (2) is positioned on same coordinate axes described stiffener (3) in the projection on frange plate (2) and corrugated web (1), and differs 1/2 wavelength.
4. a kind of Wavelike steel webplate girder construction that improves fatigue resistance according to claim 3, it is characterized in that: also comprise some WELDING STUDS (5), described WELDING STUDS (5) laterally runs through stiffener (3).
5. a kind of Wavelike steel webplate girder construction that improves fatigue resistance according to claim 4 is characterized in that: described WELDING STUDS (5) is by melting welding or to penetrate mode and the stiffener (3) of weldering fixing.
6. according to claim 4 or 5 described a kind of Wavelike steel webplate girder constructions that improve fatigue resistance, it is characterized in that: described WELDING STUDS (5) is through the flat segments of stiffener (3), and WELDING STUDS (5) is vertical with the flat segments of stiffener (3).
7. a kind of Wavelike steel webplate girder construction that improves fatigue resistance according to claim 6, it is characterized in that: also comprise some perforated rebars (6), described perforated rebar (6) is vertically through the tilting section of stiffener (3), and perforated rebar (6) is vertical with WELDING STUDS (5).
8. a kind of Wavelike steel webplate girder construction that improves fatigue resistance according to claim 3, it is characterized in that: arc transition is adopted at tilting section and the handing-over of the corner between the flat segments position of described Wavelike steel webplate (1) and corresponding stiffener (3), and the radius of curvature of this circular arc is equal to or greater than half of parallel distance between two adjacent flat segments.
9. a kind of Wavelike steel webplate girder construction that improves fatigue resistance according to claim 1, it is characterized in that: described stiffener (3) is provided with breach, this indentation, there is connected with transiting arc plate (7), and described arc plate (7) the place radius of a circle that crosses is equal to or greater than 150mm.
10. a kind of Wavelike steel webplate girder construction that improves fatigue resistance according to claim 1, it is characterized in that: the frange plate (2) that the waveform corner of described corrugated web (1) or stiffener (3) is corresponding locates to adopt bead.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105402590A (en) * | 2015-12-15 | 2016-03-16 | 河南奥斯派克科技有限公司 | High-strength concave-convex groove wave loop round rectangular pipe |
| CN105926424A (en) * | 2016-06-08 | 2016-09-07 | 卢国林 | Shell connecting flitch novel structural bridge |
| CN106376208A (en) * | 2016-11-29 | 2017-02-01 | 北京博瑞空间科技发展有限公司 | Unmanned aerial vehicle with rack reinforced structure |
| CN108291401A (en) * | 2015-09-01 | 2018-07-17 | 法尔福股份有限公司 | For the supporting beam of ceiling system, ceiling system and its manufacturing method |
| CN112475821A (en) * | 2020-11-13 | 2021-03-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-web residual tensile stress steel rail and preparation method thereof |
| CN115405010A (en) * | 2022-09-30 | 2022-11-29 | 中铁二局集团建筑有限公司 | Energy consumption segment and segment type combined buckling-restrained energy consumption support structure |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108291401A (en) * | 2015-09-01 | 2018-07-17 | 法尔福股份有限公司 | For the supporting beam of ceiling system, ceiling system and its manufacturing method |
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| CN112475821A (en) * | 2020-11-13 | 2021-03-12 | 攀钢集团攀枝花钢铁研究院有限公司 | Low-web residual tensile stress steel rail and preparation method thereof |
| CN115405010A (en) * | 2022-09-30 | 2022-11-29 | 中铁二局集团建筑有限公司 | Energy consumption segment and segment type combined buckling-restrained energy consumption support structure |
| CN115405010B (en) * | 2022-09-30 | 2023-05-23 | 中铁二局集团建筑有限公司 | Energy consumption section and sectional type combined buckling-restrained energy consumption support structure |
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