CN219451264U - Large-span stiffening thin web steel box girder structure - Google Patents
Large-span stiffening thin web steel box girder structure Download PDFInfo
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- CN219451264U CN219451264U CN202320571624.3U CN202320571624U CN219451264U CN 219451264 U CN219451264 U CN 219451264U CN 202320571624 U CN202320571624 U CN 202320571624U CN 219451264 U CN219451264 U CN 219451264U
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Abstract
The utility model provides a large-span thin web steel case roof beam structure of putting more energy into, including outer post and the thin web steel case roof beam of putting more energy into, the both ends of the thin web steel case roof beam of putting more energy into set up on the steel corbel of outer post of arranging, the thin web steel case roof beam of putting more energy into includes the convergent section at roof beam both ends and the horizontal segment at roof beam middle part, the thin web steel case roof beam of putting more energy into preceding web, the back web inside wall is provided with the horizontal stiffening rib that leads to high and with the vertical longitudinal stiffening rib that leads to of horizontal stiffening rib respectively, be provided with multichannel assemblage fossil fragments between the horizontal stiffening rib that aligns on preceding web and back web. According to the utility model, the assembly keels and the web stiffening system are arranged in the thin web steel box girder to form a space stabilizer, so that the wall thickness of the web is greatly reduced on the premise of meeting the stability, the cost is reduced, and the economy is good. The steel box girder comprises tapered sections at two ends of the girder and a horizontal section in the middle of the girder, and is arranged to be a bidirectional variable cross section along the girder length and the girder height direction according to the stress characteristics of the large-span girder, so that the material utilization rate is improved, and the indoor clear height is increased.
Description
Technical Field
The utility model relates to the technical field of large-span steel structures, in particular to a large-span stiffening thin web steel box girder structure.
Background
The large-span steel structure is usually in the form of solid web girder, truss, grid structure and other structures, in order to meet the web stability requirement of the solid web large-span steel girder, the web thickness of the steel girder with larger height is generally larger, thus resulting in poor economy and less application, and more steel truss or grid structure with larger height is used.
In order to meet the requirement of high and large web stability of the solid web girder, the web girder can also be realized by adopting thinner web thickness and arranging a reasonable stiffening system.
In the design of the multi-layer large-span heavy-load structure, under the condition that the bearing capacity and the steel consumption are basically leveled, the steel truss scheme and the net rack scheme occupy much net height, the condition that the net height requirement is not met in the design scheme is easy to cause, and the net rack scheme also has the problems of numerous inclined web members, large node size, difficulty in meeting the requirement on comfort level and the like.
Therefore, it is necessary to design a large-span steel structure with strong stability, good economy and large clearance.
Disclosure of Invention
Aiming at the problems, the utility model provides a large-span stiffening thin-web steel box girder structure, which adopts the thin-web steel box girder structure and can simultaneously meet the requirements of strong stability, good economy and large clearance.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a large-span stiffening thin web steel box girder structure which is characterized in that: the steel bracket is arranged on the outer row of columns, and two ends of the stiffening thin web steel box girder are arranged on the steel bracket; the stiffening thin web steel box girder comprises tapered sections at two ends of the girder and a horizontal section in the middle of the girder, and further comprises an upper flange arranged at the top of the tapered sections and the horizontal section, a gradually rising flange arranged at the bottom of the tapered sections and a lower flange arranged at the bottom of the horizontal section; a front web plate and a rear web plate are arranged between the upper flange and the gradually rising flange in parallel; the inner side walls of the front web plate and the rear web plate are respectively provided with a transverse stiffening rib with a through height and a longitudinal stiffening rib with a through length which is vertical to the transverse stiffening ribs, and a plurality of assembly keels are arranged between the aligned transverse stiffening ribs on the front web plate and the rear web plate.
Further, the inner side walls of the front web plate and the rear web plate are respectively provided with a pair of transverse stiffening ribs, and the longitudinal stiffening ribs are arranged between the transverse stiffening ribs.
Further, the longitudinal stiffening ribs comprise first longitudinal stiffening ribs and second longitudinal stiffening ribs, the first longitudinal stiffening ribs are arranged in the center of the beam section, two ends of each longitudinal stiffening rib are fixedly connected with the end parts of the assembly keels respectively, and the second longitudinal stiffening ribs are arranged at the height of 3/4 of the beam section between the upper flange and the first longitudinal stiffening ribs.
Furthermore, the centers of the two transverse stiffening ribs on the front web plate and the rear web plate are respectively provided with a short stiffening rib, one end of each short stiffening rib is fixedly connected with the upper flange, the other end of each short stiffening rib is fixedly connected with the first longitudinal stiffening rib, and the middle of each short stiffening rib is fixedly connected with the second longitudinal stiffening rib.
Further, embedded steel columns are vertically arranged in the outer row of columns, and the embedded steel columns are fixedly connected with steel corbels; the steel bracket is provided with a steel support, and the stiffening thin web steel box girder is arranged on the steel bracket through the steel support.
Furthermore, a plurality of outer row columns and stiffening thin web steel box girders are arranged, a plurality of stiffening thin web steel box girders are uniformly and parallelly arranged, and longitudinal concrete frame girders are arranged between adjacent outer row columns.
Further, the plurality of stiffening thin web steel box girders are provided with longitudinal stable steel box girders, upper layer steel secondary girders and lower layer steel secondary girders; the upper layer steel secondary beams are fixedly connected with the upper flanges of the stiffening thin web steel box beams in a flush mode, and the lower layer steel secondary beams are fixedly connected with the lower flanges of the stiffening thin web steel box beams in a flush mode.
Further, the longitudinal stable steel box girders are provided in a plurality, and the longitudinal stable steel box girders are uniformly arranged at two ends of the tapered section and on the horizontal section.
Further, the upper layer steel secondary beam and the lower layer steel secondary beam are provided in a plurality, and the upper layer steel secondary beam and the lower layer steel secondary beam are uniformly arranged on the taper section and the horizontal section.
Further, a longitudinal floor seam is formed between the stiffening thin web steel box girder and the outer row of columns, and the width of the longitudinal floor seam is 40-60 mm.
The utility model has the advantages and beneficial effects that:
the utility model provides a large-span stiffening thin-web steel box girder structure, which adopts a thin-web steel box girder, wherein an assembly keel and a web stiffening system are arranged in the thin-web steel box girder to form a space stabilizer, so that the wall thickness of a web is greatly reduced on the premise of meeting the stability, the cost is reduced, and the economy is good.
Secondly, the steel box girder provided by the utility model comprises the tapered sections at the two ends of the girder and the horizontal section in the middle of the girder, and the steel box girder is arranged to be a bidirectional variable cross section along the girder length and the girder height direction according to the stress characteristics of the large-span girder, so that the material utilization rate is improved, and the indoor clear height is increased.
Thirdly, the utility model utilizes the advantages of large rigidity, good integrity and small field welding amount of the large-span steel box girder, reduces a large amount of overhead operations, accelerates the installation speed, saves a large amount of measure cost and improves the safety.
Fourthly, the design purposes of ductility that the flange yield is prior to the web and the web yield is prior to buckling can be achieved after the thin web is stiffened, and the safety is higher.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the utility model, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic view of a large-span stiffening thin web steel box girder structure provided by an embodiment of the utility model;
FIG. 2 is a schematic top view of a steel box girder structure with a large-span stiffening web according to an embodiment of the present utility model;
FIG. 3 is a schematic front view of an outer column and steel box girder structure provided by an embodiment of the present utility model;
FIG. 4 is a schematic view of another view of the outer column and steel box girder structure provided by the embodiment of the utility model;
fig. 5 is a schematic structural diagram of an outer column, a longitudinal concrete frame beam and a longitudinal stable steel box girder provided by the embodiment of the utility model;
FIG. 6 is a schematic view of a stiffening thin web steel box structure according to an embodiment of the present utility model;
fig. 7 is a schematic diagram of an internal reinforcement structure of an outer column according to an embodiment of the present utility model;
in the figure: the steel box girder comprises an outer column 1, an embedded steel column 11, a stiffening thin web steel box girder 2, a tapered section 2a, a horizontal section 2b, an upper flange 21, a gradually rising flange 22, a lower flange 23, a front web 24, a rear web 25, a transverse stiffening rib 26, an assembly keel 27, a longitudinal stiffening rib 28, a first longitudinal stiffening rib 281, a second longitudinal stiffening rib 282, a short stiffening rib 29, a steel bracket 3, a steel support 31, a longitudinal concrete frame girder 4, a longitudinal stable steel box girder 5, an upper layer steel secondary girder 6, a lower layer steel secondary girder 7 and a floor longitudinal seam 8.
Detailed Description
The following describes the embodiments of the present utility model further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and are not intended to limit the scope of the present utility model.
Taking a 72m span upper floor of an exhibition hall as an example, as shown in fig. 1-7, a large-span stiffening thin web steel box girder structure comprises an outer column 1 and a stiffening thin web steel box girder 2, wherein steel corbels 3 are arranged on the outer column 1, and two ends of the stiffening thin web steel box girder 2 are arranged on the steel corbels 3; the stiffening thin web steel box girder 2 comprises tapered sections 2a at two ends of the girder and a horizontal section 2b at the middle of the girder, the stiffening thin web steel box girder 2 also comprises an upper flange 21 arranged at the top of the tapered sections 2a and 2b, a gradually rising flange 22 arranged at the bottom of the tapered sections 2a and a lower flange 23 arranged at the bottom of the horizontal section 2 b; a front web 24 and a rear web 25 are arranged in parallel between the upper flange 21 and the gradually rising flange 22, and between the upper flange 21 and the lower flange 23; the inner side walls of the front web plate 24 and the rear web plate 25 are respectively provided with a transverse stiffening rib 26 with a through height and a longitudinal stiffening rib 28 with a through length which is perpendicular to the transverse stiffening rib 26, and a plurality of assembling keels 27 are arranged between the aligned transverse stiffening ribs 26 on the front web plate 24 and the rear web plate 25.
The inner side walls of the front web plate 24 and the rear web plate 25 are respectively provided with a pair of transverse stiffening ribs 26, longitudinal stiffening ribs 28 are arranged between the transverse stiffening ribs 26, and two ends of each longitudinal stiffening rib 28 are respectively fixedly connected with the transverse stiffening ribs 26. Three assembly keels 27 are arranged between the aligned transverse stiffening ribs 26 on the front web 24 and the rear web 25, and specifically, one assembly keel 27 is respectively arranged in the middle of the upper flange, the lower flange and the beam section.
The longitudinal stiffening ribs 28 include a first longitudinal stiffening rib 281 and a second longitudinal stiffening rib 282, the first longitudinal stiffening rib 281 is disposed at the center of the beam section, and both ends are fixedly connected with the ends of the assembly joist 27, respectively, and the second longitudinal stiffening rib 282 is disposed at a 3/4 of the height of the beam section between the upper flange 21 and the first longitudinal stiffening rib 281.
The centers of the two transverse stiffening ribs on the front web 24 and the rear web 25 are also respectively provided with a short stiffening rib 29, one end of the short stiffening rib 29 is fixedly connected with the upper flange 21, the other end of the short stiffening rib 29 is fixedly connected with the first longitudinal stiffening rib 281, and the middle part of the short stiffening rib 29 is fixedly connected with the second longitudinal stiffening rib 282.
The transverse stiffening ribs 26, the longitudinal stiffening ribs 28 and the short stiffening ribs 29 form a web stiffening system, the assembly keels and the web stiffening systems on two sides form a space stabilizer, and the stability of the steel box girder is enhanced on the premise of adopting a thin web. And in consideration of processing convenience, the web stiffening system and the assembly keels are respectively selected from groove sections 100 x 6 and are welded with the flanges of the outer steel box girder and the web by single-sided fillet welds.
An embedded steel column 11 is vertically arranged in the outer column 1, and the embedded steel column 11 is fixedly connected with the steel corbel 3; the steel bracket 3 is provided with the steel support 31, the stiffening thin web steel box girder 2 is arranged on the steel bracket 3 through the steel support 31, and the bearing of the stiffening thin web steel box girder 2 is transferred to the outer column 1 through the steel bracket 3, so that the shock resistance of the stiffening thin web steel box girder 2 is increased.
The outer row of columns 1 and the stiffening thin web steel box girders 2 are provided with a plurality of stiffening thin web steel box girders 2 which are uniformly and parallelly arranged, and a longitudinal concrete frame girder 4 is arranged between the adjacent outer row of columns 1.
The plurality of stiffening thin web steel box girders 2 are provided with a longitudinal stable steel box girder 5, an upper layer steel secondary girder 6 and a lower layer steel secondary girder 7; the longitudinal stable steel box girder 5 and the upper layer steel secondary girder 6 are fixedly connected with the upper flanges 21 of the stiffening thin web steel box girders 2, and the lower layer steel secondary girder 7 is fixedly connected with the lower flanges 23 of the stiffening thin web steel box girders 2. Specifically, the upper layer steel secondary beams 6 and the lower layer steel secondary beams 7 are aligned with the upper flange elevation and the lower flange elevation of the stiffening thin web steel box beam 2 to form double-layer longitudinal steel secondary beams with the interval of 3m, and the lateral constraint of the large span beam is enhanced.
The number of the longitudinal stable steel box girders 5 is plural, and the plurality of the longitudinal stable steel box girders 5 are uniformly arranged on both ends of the tapered section 2a and the horizontal section 2 b. Specifically, 1.5m high-longitudinal stable steel box girders 5 are arranged at 1/3 positions of the two ends and the midspan of the stiffening thin web steel box girders 2, and the long span girders are formed into a whole.
The upper layer steel secondary beam 6 and the lower layer steel secondary beam 7 are provided in plurality, and the plurality of upper layer steel secondary beams 6 and the lower layer steel secondary beam 7 are uniformly arranged on the tapered section 2a and the horizontal section 2 b.
A longitudinal seam 8 of a floor slab is formed between the steel box girder 2 with the stiffening thin web plate and the outer row columns 1, the width of the longitudinal seam 8 of the floor slab is 40-60 mm, the longitudinal seam 8 of the floor slab separates the two ends of the steel box girder 2 with the outer row columns on the two sides, and the influence of additional constant load and live load of the steel box girder on the horizontal deformation of the end floor slab of the steel box girder is reduced so as to avoid the cracking of the floor slab. Although the longitudinal seam 8 of the floor slab is arranged, the horizontal force of the stiffening thin web steel box girder 2 can still be transmitted to the outer column through the steel girder and the steel corbel under the floor slab, and the influence on the overall index of the structure is small.
By adopting the steel truss scheme, in order to meet the strength and deformation requirements of a 72m large-span heavy-load structure, the height of the steel truss reaches 5.5m, even if main equipment pipelines can be arranged by utilizing gaps of the large-span structure without occupying the net height, after the suspended ceiling is deducted by 1.5m and the building surface layer is 0.1m, the net height of a layer of exhibition hall of the steel truss scheme is only 11.35m, and the net height requirement of 13m is not met. Similar to truss scheme, net rack scheme also is difficult to satisfy exhibition room clear altitude requirement, and still the diagonal web member is numerous, node size is big, and comfort level is difficult to satisfy the scheduling problem, also unsuitable adoption. Under the condition that the bending bearing capacity is basically leveled with the 5.5m high steel truss scheme, the utility model adopts the variable cross-section beam with the height and the width reduced from the midspan beam to the beam end, the midspan beam height is 3.8m, the end beam height is reduced to 1.5m, the midspan flange width is 2.1m, the beam end flange width is 1.4m, after the suspended ceiling 1.5m and the building surface layer are deducted, the net height of a steel box beam scheme exhibition hall is 13.05m, and the net height requirement of 13m is met.
In this embodiment, in order to meet the requirements of 3.5.1 of the steel structural design standard according to the consideration of the grade S3, the minimum stable wall thickness of the web plate without stiffening ribs is 54mm (3800-50 x 2)/(93 x sqrt (235/420)), and by reasonably arranging the longitudinal and transverse stiffening ribs, the wall thickness of the web plate of the 3.8m steel box girder is reduced from 54mm to 16mm, and the total steel girder is basically leveled with the 5.5m high truss scheme, so that the economy is better.
In order to achieve the ductile design purpose of 'the flange yielding before the web plate yielding before the buckling', the design principle of the stiffening thin web plate steel box girder 2 is as follows: 1) Respectively initially determining the thickness of a flange and a web according to the design bending moment and the shearing force of the large-span beam; 2) The cross section and the spacing of stiffening ribs in the web are initially determined according to stability analysis; 3) Finally, verifying whether the yield bearing capacity and the ultimate bearing capacity of the steel box girder meet the design requirements or not through finite element analysis and factory full-scale tests.
According to the utility model, the stiffening system and the assembly keels are arranged in the thin web steel box girder, so that the advantages of less material consumption, high rigidity, large clearance, less field welding amount, better comfort level and the like are obtained when the ductile design of 'the flange yielding before the web and the web yielding before the buckling' is satisfied, and the economy is remarkable. The steel box girder provided by the utility model comprises the tapered sections at the two ends of the girder and the horizontal section in the middle of the girder, and the steel box girder is arranged to be a bidirectional variable cross section along the girder length and the girder height direction according to the stress characteristics of the large-span girder, so that the material utilization rate is improved, and the indoor clear height is increased.
The utility model has the advantages of high rigidity, good integrity and small field welding amount, creatively assembles and integrates the light steel roof system, the main structure system and the electromechanical pipeline system on the ground, and then lifts the light steel roof system, the main structure system and the electromechanical pipeline system together, thereby reducing a large amount of overhead operations, accelerating the installation speed, saving a large amount of measure cost, improving the safety, actively responding to the prefabricated assembly policy from action and providing a new reference idea for large-item installation.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (10)
1. A large-span stiffening thin web steel box girder structure which is characterized in that: comprises an outer column (1) and a stiffening thin web steel box girder (2),
the steel corbels (3) are arranged on the outer row of columns (1), and two ends of the stiffening thin web steel box girder (2) are arranged on the steel corbels (3);
the stiffening thin web steel box girder (2) comprises tapered sections (2 a) at two ends of the girder and a horizontal section (2 b) in the middle of the girder,
the stiffening thin web steel box girder (2) further comprises an upper flange (21) arranged at the top of the tapered section (2 a) and the horizontal section (2 b), a gradually rising flange (22) arranged at the bottom of the tapered section (2 a) and a lower flange (23) arranged at the bottom of the horizontal section (2 b); a front web (24) and a rear web (25) are arranged in parallel between the upper flange (21) and the gradually rising flange (22) and between the upper flange (21) and the lower flange (23);
the inner side walls of the front web plate (24) and the rear web plate (25) are respectively provided with a transverse stiffening rib (26) with a through height and a longitudinal stiffening rib (28) with a through length which is perpendicular to the transverse stiffening ribs (26), and a plurality of assembly keels (27) are arranged between the transverse stiffening ribs (26) aligned on the front web plate (24) and the rear web plate (25).
2. A large span stiffened thin web steel box girder structure according to claim 1, wherein: the inner side walls of the front web plate (24) and the rear web plate (25) are respectively provided with a pair of transverse stiffening ribs (26), and the longitudinal stiffening ribs (28) are arranged between the transverse stiffening ribs (26).
3. A large span stiffened thin web steel box girder structure according to claim 2, wherein: the longitudinal stiffening ribs (28) comprise first longitudinal stiffening ribs (281) and second longitudinal stiffening ribs (282), the first longitudinal stiffening ribs (281) are arranged in the center of the beam section, two ends of each longitudinal stiffening rib are fixedly connected with the end parts of the assembly keels (27) respectively, and the second longitudinal stiffening ribs (282) are arranged at the height of the 3/4 beam section between the upper flange (21) and the first longitudinal stiffening ribs (281).
4. A large span stiffened thin web steel box girder structure according to claim 3, wherein: the middle parts of the front web plate (24) and the rear web plate (25) are respectively provided with a short stiffening rib (29), one end of each short stiffening rib (29) is fixedly connected with the upper flange (21), the other end of each short stiffening rib is fixedly connected with the first longitudinal stiffening rib (281), and the middle parts of the short stiffening ribs (29) are fixedly connected with the second longitudinal stiffening ribs (282).
5. A large span stiffening web steel box girder structure as claimed in any one of claims 1 to 4, wherein: an embedded steel column (11) is vertically arranged in the outer column (1), and the embedded steel column (11) is fixedly connected with the steel corbel (3); the steel bracket (3) is provided with a steel support (31), and the stiffening thin web steel box girder (2) is arranged on the steel bracket (3) through the steel support (31).
6. A large span stiffened thin web steel box girder structure of claim 5, wherein: the outer column (1) and the stiffening thin web steel box girder (2) are arranged in a plurality, the stiffening thin web steel box girders (2) are uniformly and parallelly arranged, and longitudinal concrete frame girders (4) are arranged between the adjacent outer columns (1).
7. A large span stiffened thin web steel box girder structure of claim 6, wherein: the stiffening thin web steel box girders (2) are provided with longitudinal stable steel box girders (5), upper layer steel secondary girders (6) and lower layer steel secondary girders (7); the longitudinal stable steel box girder (5), the upper layer steel secondary girder (6) are fixedly connected with the upper flanges (21) of all the stiffening thin web steel box girders (2) in a flush mode, and the lower layer steel secondary girder (7) is fixedly connected with the lower flanges (23) of all the stiffening thin web steel box girders (2) in a flush mode.
8. A large span stiffened thin web steel box girder structure according to claim 7, wherein: the longitudinal stable steel box girders (5) are provided with a plurality of longitudinal stable steel box girders (5), and the longitudinal stable steel box girders (5) are uniformly arranged at two ends of the tapered section (2 a) and on the horizontal section (2 b).
9. A large span stiffened thin web steel box girder structure of claim 8, wherein: the upper layer steel secondary beams (6) and the lower layer steel secondary beams (7) are provided with a plurality of upper layer steel secondary beams (6) and lower layer steel secondary beams (7) which are uniformly arranged on the tapered section (2 a) and the horizontal section (2 b).
10. A large span stiffened thin web steel box girder structure according to claim 9, wherein: and a floor longitudinal seam (8) is formed between the stiffening thin web steel box girder (2) and the outer row of columns (1), and the width of the floor longitudinal seam (8) is 40-60 mm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320571624.3U CN219451264U (en) | 2023-03-21 | 2023-03-21 | Large-span stiffening thin web steel box girder structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320571624.3U CN219451264U (en) | 2023-03-21 | 2023-03-21 | Large-span stiffening thin web steel box girder structure |
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| CN219451264U true CN219451264U (en) | 2023-08-01 |
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| CN202320571624.3U Active CN219451264U (en) | 2023-03-21 | 2023-03-21 | Large-span stiffening thin web steel box girder structure |
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