CN1974970A - Steel reinforced concrete frame structure with haunched strut - Google Patents
Steel reinforced concrete frame structure with haunched strut Download PDFInfo
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- CN1974970A CN1974970A CN 200610124126 CN200610124126A CN1974970A CN 1974970 A CN1974970 A CN 1974970A CN 200610124126 CN200610124126 CN 200610124126 CN 200610124126 A CN200610124126 A CN 200610124126A CN 1974970 A CN1974970 A CN 1974970A
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Abstract
The present invention provides a reinforced concrete frame structure with angle braces. Said reinforced concrete frame structure is made up by using frame beams and frame columns which are rigidly-connected together, and its characterized by that every nodal point where every frame beam is rigidly-connected with every frame column is equipped with an angle brace, so that the strength and stability of said reinforced concrete frame structure can be greatly raised.
Description
Technical field
The present invention relates to structure reinforced concrete frame structure and structure thereof, specifically be meant the reinforced concrete frame structure of band armpit support.
Background technology
Reinforced concrete frame is made up of Vierendeel girder and frame column, and the junction of Vierendeel girder and frame column is for rigidly connecting.Framework can be single span or multispan, single or multiple lift; Multiple bay frame can be to wait to stride or unequal span, and the floor height of multistory frame can equate or be unequal.On the general Vierendeel girder of the reinforced concrete frame of building construction the building roof plate is arranged, form frame structure system by many Pin framework and bear external load.Plate can be arranged on the rc-frame-beam of other structure, also can not have plate, can bear the frame structure system that external load or many Pin framework form by single Pin framework and bear external load.Reinforced concrete frame is because its good and economic, application property and applicability, in field of civil engineering, be widely used in multi-rise building especially.
Reinforced concrete frame structure has been carried out fruitful research both at home and abroad, the design specifications of various countries has more perfect design theory and method.But along with the raising of expanding economy, living standards of the people, the diversified requirement of building function, there has been impassable obstacle in existing reinforced concrete frame structure form in application.Mainly be reflected in for the building structure that requires large span, the Vierendeel girder span centre and the beam-ends moment of flexure of existing reinforced concrete frame structure are excessive, and the amount of deflection of Vierendeel girder span centre is also very big; The styletable moment of flexure of frame column is also excessive.Conventional design usually causes the cross section of Vierendeel girder, post excessive, arrangement of reinforcement is too much, even can't design.For general structure, also there is identical problem.
Existing application in the technical method of large-span steel-reinforced concrete frame construction conclude mainly contain following several.
(1) strengthen the cross section and the arrangement of reinforcement of rc-frame-beam, post, thus improve the framework beam and column bearing capacity, improve the rigidity of Vierendeel girder and reduce the amount of deflection of its span centre.Under span is not very big situation, can not reach certain effect, but have following problem: 1. increase the consumption of material, less economical; 2. influence the function of use of structure; 3. dead load increases, and being equivalent to load increases, and the moment of flexure of Vierendeel girder, post increases again, brings difficulty to construction simultaneously.When span was big, the problems referred to above were more outstanding, cause designing.
(2) adopt the prestressed concrete frame structure.Adopt the prestressed concrete frame beam can improve the rigidity of Vierendeel girder, the amount of deflection of minimizing Vierendeel girder span centre, but can't improve the bearing capacity of Vierendeel girder, post substantially, its application in the large-span frame structure is restricted.
(3) adopt the steel-concrete composite frame structure.The steel-concrete combo box is set a roof beam in place, the bearing capacity of post and ratio of rigidity rc-frame-beam, post height, and its suitable span is also big; But economy and application property are poor, and can't be applicable to the more requirement of large span.
(4) adopt framework beam-ends haunch.Framework beam-ends haunch has improved the bearing capacity of beam-ends, and the raising of the rigidity of the minimizing of Vierendeel girder mid span moment, Vierendeel girder is had some effects, but not obvious to the suitable span that improves framework.
In sum, existing application is in the technical method of large-span steel-reinforced concrete frame construction, is to go out to send to reach the suitable span that improves framework from the stress performance that improves structural element itself, has bigger limitation.Though adopt the structure of suitable large spans such as truss to replace the purpose that Vierendeel girder can reach large span, truss etc. are difficult to make with frame column and rigidly connect, and do not form frame structure system, and integral level rigidity is little; The structure height of while truss etc. is big more a lot of than Vierendeel girder, influences the function of use of structure.Therefore, propose that a kind of stress performance is good, economy and application property is good, the novel frame structural system that is applicable to longspan structure that can not influence or not influence substantially the function of use of structure has important significance for theories and engineering using value.
Summary of the invention
The objective of the invention is to overcome the shortcoming and defect of above-mentioned prior art, the reinforced concrete frame structure of band armpit support is provided, its stress performance is good, economy and application property are good, applicable to the longspan structure system.
Purpose of the present invention is achieved through the following technical solutions: the reinforced concrete frame structure of band armpit support, rigidly connect by Vierendeel girder, frame column and to form, the node area that described Vierendeel girder, frame column rigidly connect also is provided with the armpit support, and the upper and lower end of described armpit support rigidly connects with Vierendeel girder, frame column respectively; The interior angle α of described armpit support axis and Vierendeel girder axis
1, armpit support axis and frame column axis interior angle α
2Can determine according to the requirement of structure design so that this structure stressed rationally and satisfy the requirement of function of use.
Must realize the present invention for better, the reinforced concrete frame structure of described band armpit support can be single span or multispan, single or multiple lift; Multispan can be to wait to stride or unequal span, and the floor height of multilayer can equate or be unequal.
Compare with the reinforced concrete frame structure of routine, there is connected node in the reinforced concrete frame structure of band armpit of the present invention support in the junction of armpit support and Vierendeel girder, frame column, and the processing of the processing of these connected nodes and conventional reinforced concrete frame structure node is basic identical; The processing of beam, post is also basic identical, but should note following some.
(1) Vierendeel girder should dispose corresponding bending resistance reinforcing bar and shear reinforcement supportting link position, frame column having big moment of flexure and shearing with armpit support link position with armpit, guarantees that this cross section meets requirement for bearing capacity.
(2) Vierendeel girder is supportting link position with armpit, and an axle masterpiece that is transmitted by the armpit support is that concentrated force acts on Vierendeel girder, should arrange additional transverse steel bars (hanging muscle or additional stirrup) at Vierendeel girder and armpit support link position.
(3) frame column is supportting link position with armpit, and an axle masterpiece that is transmitted by the armpit support is that concentrated force acts on frame column, should arrange additional transverse steel bars (hanging muscle or additional stirrup) at frame column and armpit support link position.
(4) the concrete frame joint district to and armpit support link position between the Vierendeel girder part, when the ratio of shear span to effective depth of section of beam hour, should in Vierendeel girder, arrange the reinforcing bar of reporting to the leadship after accomplishing a task.
(5) the concrete frame joint district to and armpit support link position between the frame column part, when the ratio of shear span to effective depth of section of post hour, should in frame column, arrange the reinforcing bar of reporting to the leadship after accomplishing a task.
The present invention compared with prior art has following advantage and beneficial effect:
(1) setting of armpit support has changed the force mode that is subjected to of conventional reinforced concrete frame structure, has conventional reinforced concrete frame structure characteristics and advantage:
1, changed the position in the design control cross section of framework beam-ends, framework styletable.The framework beam-ends of conventional reinforced concrete frame structure, the design of styletable control cross section be respectively at beam-ends, styletable, and the design control cross section of the framework beam-ends of reinforced concrete soil zone armpit support frame construction, styletable is respectively in armpit support place of beam, post.
2, the moment of flexure value in the design of framework beam-ends, framework styletable control cross section reduces significantly.
3, the moment of flexure value in the design of Vierendeel girder span centre control cross section reduces significantly.
4, the amount of deflection of Vierendeel girder span centre reduces significantly.
(2) the present invention compares with conventional reinforced concrete frame structure technology or prestressed concrete frame structure technology, and under the certain condition of structural span, structural internal force reduces, and the sectional dimension and the arrangement of reinforcement of structural element also reduce; When the sectional dimension of structural element was identical with arrangement of reinforcement, the suitable span of structure can increase considerably.
(3) applied widely, the present invention mainly is applicable to single or multiple lift large-span concrete structural building building, also applicable to concrete structure civil engineering structure, large-span steel building construction and the steel work civil engineering structure of single or multiple lift large span.
(4) the present invention has great academic significance to the perfect frame theory, has wide practical use in engineering practice.
Description of drawings
Fig. 1 is the structural representation of the reinforced concrete frame structure (two layers of single spans) of band armpit support of the present invention;
Fig. 2 a, 2b are respectively the vertical load figure and the corresponding bending moment diagrams of conventional reinforced concrete frame structure (two layers of single spans);
Fig. 3 a, 3b are respectively the horizontal loading figure and the corresponding bending moment diagrams of conventional reinforced concrete frame structure (two layers of single spans);
Fig. 4 a, 4b are respectively vertical load and the load diagram under the horizontal loading acting in conjunction and the corresponding bending moment diagrams of conventional reinforced concrete frame structure (two layers of single spans);
Fig. 5 a, 5b are respectively the vertical load figure and the corresponding bending moment diagrams of the reinforced concrete frame structure (two layers of single spans) of band armpit support of the present invention;
Fig. 6 a, 6b are respectively the horizontal loading figure and the corresponding bending moment diagrams of the reinforced concrete frame structure (two layers of single spans) of band armpit support of the present invention;
Fig. 7 a, 7b are respectively vertical load and the load diagram under the horizontal loading acting in conjunction and the corresponding bending moment diagrams of the reinforced concrete frame structure (two layers of single spans) of band armpit support of the present invention;
Fig. 8 is reinforced concrete frame structure (two layers of single spans) the arrangement of reinforcement schematic diagram of band armpit support of the present invention;
Fig. 9 is the structural representation of the reinforced concrete frame structure (two stride two layers) of band armpit support of the present invention.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited thereto.
Embodiment one
As Fig. 1, shown in Figure 9, the reinforced concrete frame structure of this band armpit support is rigidly connected and is formed by Vierendeel girder 1, frame column 2, and the node area that Vierendeel girder 1, frame column 2 rigidly connect also is provided with armpit support 3, and the upper and lower end of armpit support 3 rigidly connects with Vierendeel girder 1, frame column 2 respectively; Armpit supports the interior angle α of 3 axis and Vierendeel girder 1 axis
1, armpit supports the interior angle α of 3 axis and frame column 2 axis
2Can determine according to the requirement of structure design so that this structure stressed rationally and satisfy the requirement of function of use.The reinforced concrete frame structure of band armpit support can be single span or multispan, single or multiple lift; Multispan can be to wait to stride or unequal span, and the floor height of multilayer can equate or be unequal.The Vierendeel girder span of Fig. 1 middle frame structure is got L=29500mm, and the frame column height is got H
1=8900mm, H
2=8700mm, interior angle α
1=40.91 °, α
2=49.09 ℃; The Vierendeel girder span of Fig. 9 middle frame structure is got L
1=29500mm, L
2=29500mm, the frame column height is got H
1=8900mm, H
2=8700mm, interior angle α
1=40.91 °, α
2=49.09 °.
Fig. 2 a, 2b～Fig. 7 a, 7b and table 1, table 2 have represented to adopt identical single span two-layer structure, the load diagram of the reinforced concrete frame structure of band armpit of the present invention support and conventional reinforced concrete frame structure or prestressed concrete frame structure (unit: KN), bending moment diagram (unit: KN-M) and the comparison of correlation technique parameter.In order to be illustrated more clearly in problem, only listed the result under the vertical load in table 1, the table 2, the result under result under the horizontal loading and vertical load and the horizontal loading acting in conjunction is roughly the same.The Vierendeel girder span of table 1, table 2 middle frame structure is got L=29500mm, and the frame column height is got H
1=8900mm, H
2=8700mm, interior angle α
1=40.91 °, α
2=49.09 °.
Table 1
| Relevant parameter | Prestressing force | Maximal bending moment (kNm) | The vertical muscle of configuration | Explanation | |||
| Positive bending moment | Hogging moment | Gluten (mm 2) | End muscle (mm 2) | Presstressed reinforcing steel | |||
| Frame-generic (beam section 600 * 1600) | Do not have | 3982.6 | -5383.4 | 18397 | 13177 | 0 | Crack, amount of deflection all do not satisfy code requirement |
| Have | 3982.6 | -5383.4 | 15332 | 11221 | 2×9BΦs | Code requirement is not satisfied in the crack | |
| Frame-generic (beam section 600 * 1600 beam-ends haunches 3400 * 200) | Do not have | 3795.7 | -5643.7 | 17995 | 12474 | 0 | Crack, amount of deflection all do not satisfy code requirement |
| Have | 3795.7 | -5643.7 | 14930 | 10518 | 2×9BΦs | Quantity of reinforcement is big | |
| Band armpit support framework (beam section 600 * 1600) | Do not have | 2554.9 | -3160.6 | 10785 | 7906 | 0 | Every index satisfies code requirement |
| Have | 2554.9 | -3160.6 | 8225 | 5484 | 2×7BΦs | Arrangement of reinforcement reduces significantly, and Crack Control is effective | |
| Band armpit support framework (beam section 600 * 1400) | Do not have | 2425.2 | -3192.9 | 12636 | 8982 | 0 | Every index satisfies code requirement |
| Have | 2425.2 | -3192.9 | 9698 | 7077 | 2×8BΦs | Arrangement of reinforcement reduces, and usage space obtains increasing | |
Table 2
| Relevant parameter | Prestressing force | Maximal bending moment (kNm) | The vertical muscle of configuration | Explanation | ||
| Positive bending moment | Hogging moment | |||||
| Column section (1000 * 1200) | Frame-generic (beam section 600 * 1600) | Do not have | 5023.7 | -3483.5 | 19610 | Arrangement of reinforcement is big |
| Have | 5023.7 | -3483.5 | 19610 | Apply prestressing force coupled columns arrangement of reinforcement and do not have influence | ||
| Frame-generic (beam section 600 * 1600 beam-ends haunches 3400 * 200) | Do not have | 5258.5 | -3633.4 | 19855 | Arrangement of reinforcement is big | |
| Have | 5258.5 | -3633.4 | 19855 | Apply prestressing force coupled columns arrangement of reinforcement and do not have influence | ||
| Band armpit support framework (beam section 600 * 1600) | Do not have | 3163.4 | -2574.7 | 11664 | Arrangement of reinforcement reduces significantly | |
| Have | 3163.4 | -2574.7 | 11664 | Apply prestressing force coupled columns arrangement of reinforcement and do not have influence | ||
| Band armpit support framework (beam section 600 * 1400) | Do not have | 3268.1 | -2517.3 | 12251 | Arrangement of reinforcement reduces significantly | |
| Have | 3268.1 | -2517.3 | 12251 | Apply prestressing force coupled columns arrangement of reinforcement and do not have influence | ||
| Column section (1000 * 1100) | Frame-generic (beam section 600 * 1600) | Do not have | 5022.9 | -3426.3 | 19981 | Arrangement of reinforcement is big |
| Have | 5022.9 | -3426.3 | 19981 | Apply prestressing force coupled columns arrangement of reinforcement and do not have influence | ||
| Frame-generic (beam section 600 * 1600 beam-ends haunches 3400 * 200) | Do not have | 4996.7 | -3569.3 | 20538 | Arrangement of reinforcement is big | |
| Have | 4996.7 | -3569.3 | 20538 | Apply prestressing force coupled columns arrangement of reinforcement and do not have influence | ||
| Band armpit support framework (beam section 600 * 1600) | Do not have | 3082.3 | -2926 | 12302 | Arrangement of reinforcement reduces significantly | |
| Have | 3082.3 | -2926 | 12302 | Apply prestressing force coupled columns arrangement of reinforcement and do not have influence | ||
| Band armpit support framework (beam section 600 * 1400) | Do not have | 3201.7 | -2573.3 | 13016 | Arrangement of reinforcement reduces significantly | |
| Have | 3201.7 | -2573.3 | 13016 | Apply prestressing force coupled columns arrangement of reinforcement and do not have influence |
As Fig. 1, Fig. 5 a, 5b～Fig. 7 a, 7b and shown in Figure 8, compare with the reinforced concrete frame structure of routine, there is connected node in the reinforced concrete frame structure of band armpit of the present invention support in the junction of armpit support 3 and Vierendeel girder 1, frame column 2, and the processing of the processing of these connected nodes and conventional reinforced concrete frame structure node is basic identical; The processing of beam, post is also basic identical, but should note following some:
(1) Vierendeel girder 1 should dispose corresponding bending resistance reinforcing bar 4 and shear reinforcement 5 supportting big moment of flexure of 3 link positions existence and shearing with armpit, guarantees that this cross section meets requirement for bearing capacity;
(2) frame column 2 should dispose corresponding bending resistance reinforcing bar 6 and shear reinforcement 7 supportting big moment of flexure of 3 link positions existence and shearing with armpit, guarantees that this cross section meets requirement for bearing capacity.
(3) Vierendeel girder 1 is supportting 3 link positions with armpit, and axle masterpieces that transmitted by armpit support 3 are that concentrated force acts on Vierendeel girder 1, supports 3 link positions at Vierendeel girder 1 and armpit and should arrange additional transverse steel bars 8 (hanging muscle or additional stirrup).
(3) frame column 2 is supportting 3 link positions with armpit, and axle masterpieces that transmitted by armpit support 3 are that concentrated force acts on frame column, supports 3 link positions at frame column 2 and armpit and should arrange additional transverse steel bars 9 (hanging muscle or additional stirrup).
(4) the concrete frame joint district to and armpit support Vierendeel girder 1 part between 3 link positions, when the ratio of shear span to effective depth of section of Vierendeel girder 1 hour, should in Vierendeel girder 1, arrange the reinforcing bar 10 of reporting to the leadship after accomplishing a task.
(5) the concrete frame joint district to and armpit support frame column 2 parts between 3 link positions, when the ratio of shear span to effective depth of section of frame column 2 hour, should in frame column 2, arrange the reinforcing bar 11 of reporting to the leadship after accomplishing a task.
As mentioned above, just can realize the present invention preferably.
Claims (10)
1, the reinforced concrete frame structure of band armpit support is rigidly connected by Vierendeel girder, frame column and to form, and it is characterized in that: the node area that described Vierendeel girder, frame column rigidly connect also is provided with the armpit support, and the upper and lower end of described armpit support rigidly connects with Vierendeel girder, frame column respectively.
2, according to the reinforced concrete frame structure of the described band armpit support of claim 1, it is characterized in that: the reinforced concrete frame structure of described band armpit support is single span or multispan; Described multispan is to wait to stride or unequal span.
3, according to the reinforced concrete frame structure of the described band armpit support of claim 1, it is characterized in that: the reinforced concrete frame structure of described band armpit support is a single or multiple lift; The floor height of described multilayer is equal or unequal.
4, according to the reinforced concrete frame structure of the described band armpit support of claim 1, it is characterized in that: described Vierendeel girder is disposing bending resistance reinforcing bar and shear reinforcement with armpit support link position.
5, according to the reinforced concrete frame structure of the described band armpit support of claim 1, it is characterized in that: described frame column is disposing bending resistance reinforcing bar and shear reinforcement with armpit support link position.
6, according to the reinforced concrete frame structure of the described band armpit support of claim 1, it is characterized in that: described Vierendeel girder is being furnished with additional transverse steel bars with armpit support link position.
7, according to the reinforced concrete frame structure of the described band armpit support of claim 1, it is characterized in that: described frame column is being furnished with additional transverse steel bars with armpit support link position
8, according to the reinforced concrete frame structure of the described band armpit of claim 1 support, it is characterized in that: described concrete frame joint district to and armpit support link position between Vierendeel girder in be furnished with the reinforcing bar of reporting to the leadship after accomplishing a task.
9, according to the reinforced concrete frame structure of the described band armpit of claim 1 support, it is characterized in that: described concrete frame joint district to and armpit support link position between frame column in be furnished with the reinforcing bar of reporting to the leadship after accomplishing a task.
10, according to the reinforced concrete frame structure of claim 6 or 7 each described band armpit supports, it is characterized in that: described additional transverse steel bars comprises hangs muscle or additional stirrup.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101241265A CN1974970B (en) | 2006-12-08 | 2006-12-08 | Steel reinforced concrete frame structure with haunched strut |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101241265A CN1974970B (en) | 2006-12-08 | 2006-12-08 | Steel reinforced concrete frame structure with haunched strut |
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| CN1974970A true CN1974970A (en) | 2007-06-06 |
| CN1974970B CN1974970B (en) | 2011-11-02 |
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| CN101615212B (en) * | 2009-07-28 | 2011-10-26 | 武汉理工大学 | Simplified design calculation method of piling-inner supporting system |
| CN102251613A (en) * | 2010-05-21 | 2011-11-23 | 舒华 | Arched corrugated steel roof with improved use span and method for improving use span of arched corrugated steel roof |
| CN102383495A (en) * | 2011-08-31 | 2012-03-21 | 广州市设计院 | Double-layer vierendeel truss structure system of large cantilever structure |
| CN102767234A (en) * | 2011-04-30 | 2012-11-07 | 黄靓 | Reinforced concrete frame structure with steel ropes |
| CN105113510A (en) * | 2015-08-24 | 2015-12-02 | 中国建筑第八工程局有限公司 | Inner supporting beam structure for foundation pit soil outlet opening in reverse construction method and construction method |
| CN105714968A (en) * | 2016-02-24 | 2016-06-29 | 郭猛 | Concrete floor optimized design method capable of relieving earthquake damages on strong beams and weak columns |
| CN106088326A (en) * | 2014-12-23 | 2016-11-09 | 中国建筑第八工程局有限公司 | The assembling frame rod structure printed based on 3D |
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| CN108222248A (en) * | 2016-12-09 | 2018-06-29 | 中国电力工程顾问集团华东电力设计院有限公司 | Multi-layer concrete frame structure of the bottom with conversion beam in a kind of power plant |
| CN108571181A (en) * | 2018-06-06 | 2018-09-25 | 福州大学 | RC frame joints ruggedized construction based on column steel bonding-haunch and reinforcement means |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101615212B (en) * | 2009-07-28 | 2011-10-26 | 武汉理工大学 | Simplified design calculation method of piling-inner supporting system |
| CN102251613A (en) * | 2010-05-21 | 2011-11-23 | 舒华 | Arched corrugated steel roof with improved use span and method for improving use span of arched corrugated steel roof |
| CN102767234A (en) * | 2011-04-30 | 2012-11-07 | 黄靓 | Reinforced concrete frame structure with steel ropes |
| CN102383495A (en) * | 2011-08-31 | 2012-03-21 | 广州市设计院 | Double-layer vierendeel truss structure system of large cantilever structure |
| CN102383495B (en) * | 2011-08-31 | 2014-12-10 | 广州市设计院 | Double-layer vierendeel truss structure system of large cantilever structure |
| CN106088326B (en) * | 2014-12-23 | 2018-06-19 | 中国建筑第八工程局有限公司 | Assembling frame rod structure based on 3D printing |
| CN106088326A (en) * | 2014-12-23 | 2016-11-09 | 中国建筑第八工程局有限公司 | The assembling frame rod structure printed based on 3D |
| CN105113510A (en) * | 2015-08-24 | 2015-12-02 | 中国建筑第八工程局有限公司 | Inner supporting beam structure for foundation pit soil outlet opening in reverse construction method and construction method |
| CN105714968A (en) * | 2016-02-24 | 2016-06-29 | 郭猛 | Concrete floor optimized design method capable of relieving earthquake damages on strong beams and weak columns |
| CN105714968B (en) * | 2016-02-24 | 2019-02-19 | 郭猛 | Mitigate the concrete floor optimum design method of the weak column earthquake of brutal |
| CN107542197A (en) * | 2016-06-26 | 2018-01-05 | 李乔林 | Trapezoidal roof, the building scheme on the bucket-shaped roof of gable roof and side and the form erecting technology of on-plane surface top plate of plate-girder composite integrated |
| CN108222248A (en) * | 2016-12-09 | 2018-06-29 | 中国电力工程顾问集团华东电力设计院有限公司 | Multi-layer concrete frame structure of the bottom with conversion beam in a kind of power plant |
| CN108571181A (en) * | 2018-06-06 | 2018-09-25 | 福州大学 | RC frame joints ruggedized construction based on column steel bonding-haunch and reinforcement means |
| CN114250899A (en) * | 2021-12-24 | 2022-03-29 | 奥意建筑工程设计有限公司 | Single-inclined-support large-span floor structure system |
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