CN102758501B - High-strength spiral hoop confined high-strength wide flange cross-shaped steel reinforced octagonal concrete column - Google Patents
High-strength spiral hoop confined high-strength wide flange cross-shaped steel reinforced octagonal concrete column Download PDFInfo
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- CN102758501B CN102758501B CN201210256940.8A CN201210256940A CN102758501B CN 102758501 B CN102758501 B CN 102758501B CN 201210256940 A CN201210256940 A CN 201210256940A CN 102758501 B CN102758501 B CN 102758501B
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Abstract
The invention relates to steel reinforced concrete columns, particularly to a high-strength spiral hoop confined high-strength wide flange cross-shaped steel reinforced octagonal concrete column, which overcomes the defects of the cross-shaped steel reinforced concrete column that the construction is difficult, the thickness of the concrete protective layer causes the insufficient realization of the bending resistance of the steel reinforced, and the high-strength steel reinforced has high possibility of lateral deflection. As the longitudinal reinforcing steel is removed, the area of the reinforcing steel is converted to the steel reinforced flange, the construction and design of the steel reinforced concrete column are facilitated; the spiral hoop is the high-strength octagonal spiral hoop, the inner side of the spiral hoop of the confined steel reinforced flange is closely attached to the surface of the steel reinforced flange, the unstability critical stress of the steel reinforced flange is improved through the free edge of the confined steel reinforced flange, and the spiral hoop is closely joined with the flange at the same time, so as to realize the action of stud, as a result, the coordination between the concrete and the steel reinforced is better realized; the concrete protective layer of the steel reinforced ranges from 30 to 40mm., so as to meet the requirement of fire prevention and enables the steel reinforced to better realize the action of bending resistance; and as the area cut from the octagonal concrete column is less than 8%, the area can be compensated by improving the concrete strength. The high-strength spiral hoop confined high-strength wide flange cross-shaped steel reinforced octagonal concrete column is applied to the steel reinforced concrete structures.
Description
Technical field
The present invention relates to a kind of profile steel concrete column.
Background technology
Profile steel concrete column refers to and in concrete, configures shaped steel, and is furnished with the structure of certain lateral tie and Reinforcement, and post Shaped Steel mainly contains i shaped steel, H shaped steel and cross-shaped steel.Profile steel concrete column has that bearing capacity is high, rigidity is large and the advantage such as anti-seismic performance is good, has been widely used in the highrise building of large-span structure and earthquake zone.
In profile steel concrete column, the material that these two kinds of performances of type Steel concrete are different can co-operation be owing to there being cementation between them, due to shaped steel smooth surface, so bond between steel and concrete intensity is equivalent to 30% of 60% and indented bars of plain bar and Concrete Bond Strength and Concrete Bond Strength, for make shaped steel can with concrete co-ordination, " reinforced concrete composite structure tecnical regulations " and " steel reinforced concrete structure design discipline " separate provision profile steel concrete column protective layer thickness is not less than 120 millimeters and 150 millimeters, in actual engineering design, protective layer thickness is also larger than the numerical value of regulation and stipulation, because the blocked up shaped steel of topping is often arranged in the position partially in cross section, cause in fact shaped steel mainly to bring into play resistance to compression effect, unbending is not brought into play completely, although suppose in design formulas that shaped steel is to bring into play unbending completely.
Under seismic force effects; shaped steel outside concrete cover may come off; so the flakiness ratio of section steel flange will meet certain requirement; with section steel flange generation secondary buckling after avoiding concrete cover to come off; so just limit the application of high strength shaped steel, so because the high section steel flange thin thickness of yield strength, than low-intensity shaped steel, lateral deflection more easily occurs.
Because profile steel concrete column is made up of Reinforcement, shaped steel, transverse reinforcement, when construction, to carry out Construction of Steel Structure and structure of reinforced concrete simultaneously, so construction is complicated, than independent Construction of Steel Structure or independent structure of reinforced concrete trouble.
Because common hoop strength is low, incomplete to concrete constraint.When concrete compression expansion or shearing slip, stirrup is easily surrendered, thereby loses concrete restraint forces.There are 135 ° of crotches in common stirrup end, under seismic forces repeated action, and outside concrete disintegrating, easily there is the phenomenon that releases in stirrup hook, thereby loses the constraint to inner concrete and longitudinal reinforcement, further increases the weight of the earthquake of pillar.
In the time of high-rise building design, from the angle of Control Shaft pressure ratio, require pillar sectional dimension to want enough large, from control ratio of shear span to effective depth of section angle, require the post section can not be excessive.Two kinds of controls tend to conflict.Some layers of post cross dimensions of highrise building fundus are often compared with being difficult to greatly and simultaneously meet the requirement that reaches long column.Solving one of way of this contradiction is exactly to adopt high strength concrete, but high-strength concrete is more crisp compared with lower intensity level concrete, is unfavorable for antidetonation.
Summary of the invention
The object of the invention is to overcome the shortcoming of cross-shaped steel concrete column conventional in engineering, a kind of high-strength spiral hoop restraint and high-strength wide width wing edge cross-shaped steel octagon concrete column is provided.The present invention will solve existing cross-shaped steel concrete column construction inconvenience, concrete protective bed thickness and cause post Shaped Steel not bring into play completely easily to release when the low and end of unbending, stirrup intensity has 135 ° of crotch earthquakes and cause, high strength shaped steel easy lateral deflection inconvenience undesirable to concrete and shaped steel binding effect to be applied to a series of shortcomings such as engineering.
The object of the invention is to reach by following measure:
Pillar cross section is octagon; high-strength spiral hoop is octagon spiral hoop; the inner side of the high-strength spiral hoop of restraint and high-strength section steel flange is close to the surface of section steel flange; the thickness of concrete cover of high-strength shaped steel is 30-40 millimeter; in post, there is no Reinforcement, replace by the area that increases high-strength section steel flange the Reinforcement being cancelled.
It is characterized in that:
Stirrup adopts spiral hoop, the yield strength standard value of stirrup can not be less than 1100 MPas, and maximum, force percentage of total elongation can not be less than 4%, spiral hoop steel are selected high-strength heat tempering bar, stirrup machining, to ensure crudy, scale error can not exceed ± and 1 millimeter, to ensure that stirrup inner surface can tightly be affixed with section steel flange surface; In the time that stirrup diameter is less than 10mm, the concrete cover of shaped steel is 30mm, and in the time that stirrup diameter is greater than 10mm, the concrete cover of shaped steel is 40mm; Cancel the Reinforcement in profile steel concrete column, section steel flange thickening is lengthened and replaces Reinforcement, the width of section steel flange can not be less than the octagon post Breadth Maximum of 0.6 times, can not be greater than the octagon post Breadth Maximum of 0.7 times.
Adopt digital control hoop bender processing high strength helical hoop, spiral hoop scale error is ± 1mm, spiral hoop is tightly enclosed within shaped steel surface, play effect of contraction, section steel flange fringe conditions is improved, made original three limit freely-supporteds, computation model becomes three limit freely-supporteds freely on one side, the computation model of approximate freely-supported on one side, according to elastic stability theory, rectangular thin plate buckling critical stress design formulas is as follows:
κ=4 in the time of quadrilateral simply supported slab
When three limit freely-supporteds, the free plate in one side
Greatly improve thus the buckling critical stress of section steel flange, thereby the flakiness ratio of section steel flange can be improved, can use high-intensity shaped steel, steel yield strength is not less than 500 MPas, be not more than 700 MPas, so saved steel, the pitch that can imagine spiral hoop is that 0 o'clock section steel flange does not exist destabilization problems, so the local spiral hoop pitch large in moment of flexure is 0-30mm, the local spiral hoop pitch little in moment of flexure is 30-80mm.
Because spiral hoop is tightly enclosed within shaped steel external surface, and an entirety of shaped steel formation, spiral hoop can stop the changing of the relative positions between concrete and shaped steel, effect is equivalent to peg, can make shaped steel and cover concrete collaborative work, stressed highly beneficial to entirety.
In order to make the better co-ordination of shaped steel and concrete, round hole is set on section steel flange and web, circle hole dia is 30mm; Each edge of a wing arranges two row's circle holes, this trisection edge of a wing, two rows circle hole, and circle hole vertical interval 500mm, two row's circle holes are staggeredly arranged.On each web, arrange two row's circle holes, this two rows circle hole trisection web, circle hole vertical interval 500mm, two row's circle holes are staggeredly arranged, and consider the plasticity of steel, and on shaped steel, opening diameter 30mm hole does not affect shaped steel bearing capacity.
Because this steel reinforced concrete column section is octagon, area reduces by approximately 8% left and right, so want working strength loss with the Compressive Bearing Capacity that makes up the minimizing of section area and bring higher than the concrete of C50.
The high-strength shaped steel steel ratio of this Novel section steel concrete column is 10%-30%.
Beneficial effect of the present invention is:
Owing to having cancelled longitudinal reinforcement, longitudinal reinforcement area is converted on section steel flange, facilitate construction, mechanical concept is clear, is convenient to structure design.
Because thickness of concrete cover only has 30-40mm, section steel flange, away from kernel of section, has been given full play to unbending, also highly beneficial to antidetonation, and the concrete cover of 30-40mm is enough to meet fireproof requirement simultaneously.
Owing to having adopted stirrups more than yield strength 1100 MPas, greatly improve the anti-seismic performance of pillar.
Owing to having adopted concrete more than C50 can reduce the ratio of axial compressive force to axial compressive ultimate capacity of section of pillar, highly beneficial to structural seismic.
Because section steel flange is retrained, can relax the restriction of edge of a wing flakiness ratio, use high strength shaped steel.
Due to the spiral hoop of digital control hoop bender machining high-precision, spiral hoop can tightly be enclosed within on shaped steel, and the effect of spiral hoop is equivalent to peg, makes shaped steel and concrete cover energy entirety stressed.
Theoretical research and earthquake experience all show, earthquake is complicated multi-support and multi-dimension motion.Multidimensional refers to earthquake motion and comprises three translations and three rotative components, so section steel flange is wide and can improve the anti-seismic performance of post away from the center in cross section.We study and show by experiment: the shaped steel of high strength helical hoop restraint and high-strength wide width wing edge cross-shaped steel concrete column and concrete can collaborative work to ultimate bearing capacity state, cross section strain meets plane hypothesis substantially, in the time that experiment ratio of axial compressive force to axial compressive ultimate capacity of section is 0.7, hysteresis loop is still fuller, test component energy dissipation capacity is strong, and rigidity, strength degradation are not obvious.
Following table provides the anti-seismic performance contrast of two kinds of profile steel concrete column of identical steely area:
Can find out, the in the situation that in post, steely area being the same, profile steel concrete column indices of the present invention has significantly raising.
Brief description of the drawings
The cross section of conventional cross-shaped steel concrete column in the current engineering of Fig. 1
Structure design code specifies at present: the shaped steel protective layer thickness shown in Fig. 1 is not less than 120 millimeters, is greater than 120 millimeters in actual design, causes shaped steel near kernel of section, and the resistance to compression effect of performance is greater than the unbending of performance.
The cross section of the high-strength spiral hoop restraint and high-strength of Fig. 2 wide width wing edge cross-shaped steel octagon high-strength concrete column
In Fig. 2,1 is shaped steel, and 2 is section steel flange, and 3 is octagon spiral hoop, and 4 is shape steel web
The octagon post Breadth Maximum that section steel flange 2 length are greater than 0.6 times, is less than the octagon post Breadth Maximum of 0.7 times.
Section steel flange surface will be close in that section of spiral hoop inner side on the octagon spiral hoop 3 binding type steel edges of a wing 2.
Detailed description of the invention
Steel column 1 is made by professional steel work company, and section steel flange 2 width are not less than 0.6 times of octagon post Breadth Maximum, is not more than 0.7 times of octagon post Breadth Maximum, in the time of processing section steel flange and web, round hole is all set above.By digital control hoop bender processing octagon spiral hoop 3, machining accuracy is ± 1 millimeter, the octagon spiral hoop 3 of making is enclosed within on shaped steel, the inner surface of the spiral hoop on the binding type steel edge of a wing 2 will be affixed with section steel flange external surface, the corresponding some circle spiral hoops of one segment type steel column, spiral hoop initiating terminal will enclose around shaped steel 1, end will enclose around shaped steel 1, stirrup overlap joint welding requirements: double welding is not less than 5d, d is stirrup diameter, one side welding is not less than 10d, and welding rod intensity is not less than 500 MPas, and weld seam is full.
Claims (6)
1. a high-strength spiral hoop restraint and high-strength wide width wing edge cross-shaped steel octagon concrete column, this post is by high-strength shaped steel (1) and to be enclosed within the high-strength spiral hoop (3) of high-strength shaped steel (1) outside integral by pouring concrete, it is characterized in that: pillar cross section is octagon, high-strength spiral hoop (3) is octagon spiral hoop, the inner side of the high-strength spiral hoop (3) of restraint and high-strength section steel flange (2) is close to the surface of high-strength section steel flange (2), the thickness of concrete cover of high-strength shaped steel (1) is 30-40 millimeter, in post, there is no Reinforcement, replace by the area that increases high-strength section steel flange (2) Reinforcement being cancelled, high-strength shaped steel (1) steel ratio is 10%-30%, in order to make the better co-ordination of shaped steel and concrete, round hole is set on section steel flange and web, circle hole dia 30mm, each edge of a wing arranges two row's circle holes, two row's circle holes are edge of a wing trisection, circle hole vertical interval 500mm, two row's circle holes are staggeredly arranged, on each web, arrange two row's circle holes, two row's circle holes are web trisection, circle hole vertical interval 500mm, two row's circle holes are staggeredly arranged.
2. high-strength spiral hoop restraint and high-strength wide width wing edge cross-shaped steel octagon concrete column according to claim 1, it is characterized in that: its yield strength of high-strength spiral hoop (3) is greater than 1100 MPas, under maximum, force, percentage of total elongation is greater than 4%, and high-strength spiral hoop (3) is selected high-strength heat tempering bar.
3. high-strength spiral hoop restraint and high-strength wide width wing edge cross-shaped steel octagon concrete column according to claim 1, is characterized in that: high-strength shaped steel (1) yield strength is not less than 500 MPas, is not more than 700 MPas, and in post, concrete strength is higher than C50.
4. high-strength spiral hoop restraint and high-strength wide width wing edge cross-shaped steel octagon concrete column according to claim 1, it is characterized in that: octagon is obtained by square 4 triangles of pruning, each triangle edges is grown up in 0.15 times of the square length of side, be less than 0.2 times of the square length of side, four triangle areas and be no more than 8% of the square gross area, the octagon post Breadth Maximum that high-strength section steel flange (2) width is greater than 0.6 times, is less than the octagon post Breadth Maximum of 0.7 times.
5. high-strength spiral hoop restraint and high-strength wide width wing edge cross-shaped steel octagon concrete column according to claim 1; it is characterized in that: in the time that high-strength spiral hoop (3) diameter is less than 10 millimeters; the concrete cover of high-strength shaped steel (1) is 30 millimeters; in the time that high-strength spiral hoop (3) diameter is greater than 10 millimeters, the concrete cover of high-strength shaped steel (1) is 40 millimeters.
6. high-strength spiral hoop restraint and high-strength wide width wing edge cross-shaped steel octagon concrete column according to claim 1, it is characterized in that: high-strength spiral hoop (3) initiating terminal will be around high-strength shaped steel (1) 1 circle, end will be around high-strength shaped steel (1) 1 circle, high-strength spiral hoop (3) overlap joint welding requirements double welding is not less than 5d, d is high-strength spiral hoop (3) diameter, one side welding is not less than 10d, welding rod intensity is not less than 500 MPas, and weld seam is full.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210256940.8A CN102758501B (en) | 2012-07-23 | 2012-07-23 | High-strength spiral hoop confined high-strength wide flange cross-shaped steel reinforced octagonal concrete column |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210256940.8A CN102758501B (en) | 2012-07-23 | 2012-07-23 | High-strength spiral hoop confined high-strength wide flange cross-shaped steel reinforced octagonal concrete column |
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| CN102758501A CN102758501A (en) | 2012-10-31 |
| CN102758501B true CN102758501B (en) | 2014-07-23 |
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| CN103850392B (en) * | 2012-12-04 | 2016-01-20 | 北京工业大学 | Vertical floor concrete column with holes and the practice is established between outer square steel pipe inner circle steel pipe |
| CN103924735A (en) * | 2014-04-10 | 2014-07-16 | 北京工业大学 | Batten plate constraint type confined concrete column with cross steel bone with flanges and fabrication method of column |
| CN105133790A (en) * | 2015-08-28 | 2015-12-09 | 风范绿色建筑（常熟）有限公司 | High-strength square steel tube concrete pillar |
| CN107869214A (en) * | 2017-11-20 | 2018-04-03 | 上海三益建筑设计有限公司 | Shaped steel steel core concrete column |
| CN112900748A (en) * | 2021-01-25 | 2021-06-04 | 江南大学 | Prefabricated assembly type square steel tube honeycomb steel rib concrete combined column and manufacturing method thereof |
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| JPH0544299A (en) * | 1991-08-08 | 1993-02-23 | Fujita Corp | Reinforcing structure of structural steel reinforced concrete structure column member |
| CN1970958A (en) * | 2006-12-05 | 2007-05-30 | 西安建筑科技大学 | Cross type steel concrete profiled pole with solid-web steel framework |
| CN201671226U (en) * | 2010-05-25 | 2010-12-15 | 西安建筑科技大学 | Expanded flanged cross-shaped steel SRC column |
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