CN102505805A - Mixed reinforcement high-strength reinforced concrete component - Google Patents
Mixed reinforcement high-strength reinforced concrete component Download PDFInfo
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- CN102505805A CN102505805A CN2011103743318A CN201110374331A CN102505805A CN 102505805 A CN102505805 A CN 102505805A CN 2011103743318 A CN2011103743318 A CN 2011103743318A CN 201110374331 A CN201110374331 A CN 201110374331A CN 102505805 A CN102505805 A CN 102505805A
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Abstract
The invention relates to a reinforced concrete component, in particular to a mixed reinforcement high-strength reinforced concrete component. The component comprises concrete and reinforcing steel bars, wherein the reinforcing steel bars serving as frameworks are arrayed in the component; and the four sides of the reinforcing steel bars are wrapped by the concrete. The reinforcing steel bars arrayed in the component are prepared by mixing reinforcing steel bars with different levels of strength. The mixing preparation is performed in one of or combination of the following ways: the way that hot-rolled ribbed reinforcing steel bars with HRB400 or less are mixed with hot-rolled ribbed reinforcing steel bars with over HRB400; the way that the hot-rolled ribbed reinforcing steel bars with HRB400 or less are mixed with hot-rolled molded and thermally-processed ribbed reinforcing steel bars with over 400MPa of strength level; and the way that the hot-rolled ribbed reinforcing steel bars with HRB400 or less are mixed with the hot-rolled ribbed reinforcing steel bars with over HRB400 and the hot-rolled molded and thermally-processed ribbed reinforcing steel bars with over 400MPa of strength level. The crack width of the reinforced concrete component can be effectively reduced. When the high-strength reinforcing steel bars with over 400MPa of yield strength are used, crack width of the reinforced concrete component can be controlled in a regulated range. The using amount of the high-strength reinforcing steel bars is increased.
Description
Technical field
The present invention relates to a kind of reinforced concrete member, specifically a kind of high tensile reinforcement concrete component of hybrid reinforcement.
Background technology
The member of reinforced concrete member for processing with Reinforced Concrete Materials; Comprise concrete and reinforcing bar; Reinforcing bar is built in the member as the skeleton of member, and by the concrete parcel, reinforced concrete member both can make individual member around the reinforcing bar; Also can form whole member-board-like superstructure, or form whole single or multiple lift framework with reinforced concrete post with armored concrete slab.The reinforced concrete member form is varied, is the most basic supporting member in the engineering structuress such as building construction, bridge member building, and range of application is extremely wide.Along with applying of high tensile reinforcement, the grade that China's civil engineering structure reinforcing bar material adopts turns to HRB400 level and even HRB500 level from early stage HPB235 level and HRB335 level gradually.The use of high tensile reinforcement helps practicing thrift steel, but along with the height of reinforcing bar is strengthened, the also corresponding raising of the use working stress of reinforcing bar makes that the crack problem of reinforced concrete structure is outstanding, even becomes an important control factor in the structure design.When the hot rolled ribbed steel bar that single configuration HRB400 level is above or the reinforced concrete member of hot-roll forming heat treatment Ribbed Bar; Crack width does not satisfy code requirement in some cases; The crack width code requirement is different according to the classification of environment, generally needs to satisfy less than 0.2mm, less than 0.3mm or less than 0.4mm.For high tensile reinforcement can be applied smoothly, and science solves the problem of high tensile reinforcement to the concrete structure crack performance accurately, is necessary to propose a kind of new reinforcing bar configuration mode.
Summary of the invention
Technical problem to be solved by this invention is; Overcome the shortcoming of prior art; Effectively reduce the reinforced concrete structure member crevices width, during high tensile reinforcement more than using yield strength 400MPa, the structure member crevices width can be controlled within the code requirement; Increase the use amount of high tensile reinforcement, propose a kind of high tensile reinforcement concrete component of hybrid reinforcement.
The technical scheme that the present invention solves above technical problem is:
A kind of high tensile reinforcement concrete component of hybrid reinforcement; Comprise concrete and reinforcing bar; Reinforcing bar as the skeleton arrangement of member in member; By the concrete parcel, be arranged in reinforcing bar in the member by the reinforcing bar mixed configuration of different intensity grades around the reinforcing bar, mixed configuration is selected the one or more combination of following mode:
(1) HRB400 and with the hot rolled ribbed steel bar of subordinate and the hot rolled ribbed steel bar mixed configuration of HRB400 higher level;
(2) HRB400 and with the hot rolled ribbed steel bar of subordinate and the above hot-roll forming heat treatment Ribbed Bar mixed configuration of strength grade 400MPa (yield strength);
(3) HRB400 and with the hot rolled ribbed steel bar and the above hot-roll forming heat treatment Ribbed Bar mixed configuration of strength grade 400MPa (yield strength) of the hot rolled ribbed steel bar of subordinate and HRB400 higher level;
The reinforcing bar of hot-roll forming heat treatment Ribbed Bar for obtaining through following processing step:
(1) by the chemical analysis of steel mill by following percentage by weight:
C：0.10～0.5％，
Si：0.3～1.8％，
Mn：0.6～1.9％，
Nb：0.02～0.2％，
V：0.01～0.1％，
One or more trace alloying elements in Ni:0.01～0.2%, Cr:0.1～0.5%, Ti:0.015～0.2%, B:0.001～0.005%,
Fe: surplus,
Smelting also rolls into screwed wire rod or vertical bar;
(2) will roll good screw wire rod or vertical bar sends into heating furnace and is heated to 850～1100 ℃; Be cooled to 600～690 ℃ through cooling unit then; Water or quenching liquid carry out quenching in 5～30 seconds in quencher, are heated to 450～650 ℃ of tempering through the tempering heating furnace again;
(3) cooling processing is to normal temperature, the warehouse-in of testing at last.
The production technology of above hot-roll forming heat treatment Ribbed Bar can see patent name for details: a kind of processing method of high strong flexor ratio high-ductility steel product for prestressed concrete; Application number: 201110086374.6; The applying date: 2011-04-07, publication number: 102181798A, disclosed content.
The technical scheme that the present invention further limits is: (qualification of making in the face of the 630MPa reinforcing bar down, also just like 500MPa, or higher 700MPa steel how to make qualification?)
The high tensile reinforcement concrete component of aforesaid hybrid reinforcement; Be arranged in reinforcing bar in the member by the hot-roll forming heat treatment Ribbed Bar mixed configuration of the hot rolled ribbed steel bar and the strength grade 630MPa (yield strength) of HRB400 level, the ratio that the hot-roll forming heat treatment Ribbed Bar of strength grade 630MPa accounts for total area of reinforcement is 0.4～0.85.Need to prove; The hot-roll forming heat treatment Ribbed Bar of strength grade 630MPa is meant the hot-roll forming heat treatment Ribbed Bar of strength grade more than or equal to 630MPa in the reinforcing bar field, is " HTB630 reinforcing bar " hereinafter to be referred as " the hot-roll forming heat treatment Ribbed Bar of strength grade 630MPa (yield strength) ".During concrete arrangement of reinforcement, can require to select the ratio of the shared total area of reinforcement of HTB630 reinforcing bar according to practice of construction; In addition; The arrangement mode of HRB400 reinforcing bar and HTB630 reinforcing bar can be decided according to the concrete ratio that the HTB630 reinforcing bar accounts for total area of reinforcement, can be HTB630 reinforcing bar of two HRB400 reinforcing bar therebetween, also can be HTB630 reinforcing bar of four HRB400 reinforcing bar therebetween; It can also be alternate manner; Concrete arrangement mode has varied, can decide according to the practical project needs, and the ratio that only needs the HTB630 reinforcing bar to account for total area of reinforcement meets the demands and gets final product.
The high tensile reinforcement concrete component of aforesaid hybrid reinforcement, reinforcement ratio is at 0.6%＜ρ＜0.9% o'clock, and selecting diameter for use is the HTB630 reinforcing bar of Φ 12mm or 14mm; Reinforcement ratio is at 0.9%＜ρ＜1.0% o'clock, and selecting diameter for use is the HTB630 reinforcing bar of Φ 14mm or Φ 16mm; Reinforcement ratio ρ＞1.1% o'clock, selecting diameter for use is the HTB630 reinforcing bar of Φ 18mm or Φ 20mm.
The invention has the beneficial effects as follows: use the reinforcing bar mixed configuration of different intensity grades of the present invention, the reinforced concrete structure member crevices width is controlled within the code requirement, can save amount of reinforcement again; Because use high tensile reinforcement intensity is high, compares the plain bars diameter and can dwindle, and is in light weight, can reach the purpose of material-saving; Can improve the bearing capacity of concrete component through the use high tensile reinforcement, so can reduce the surface area of concrete component under the same terms, thereby can reduce the weight of concrete component, reach and practice thrift the concrete purpose.In a word, through the reinforcing bar mixed configuration of different intensity grades, when practicing thrift reinforcing bar and concrete amount, reach the reinforced concrete structure member crevices width is controlled within the code requirement.
The specific embodiment
Comparative Examples
The reinforced concrete member of this Comparative Examples is only joined the HTB630 reinforcing bar, member section: 200mm*400mm; Protective layer thickness: 25mm; Effective depth of section: double-deck arrangement of reinforcement (more than 4) 340mm, individual layer arrangement of reinforcement 365mm; Concrete: C35; Arrangement of reinforcement scheme in the table 1, same member bar diameter kind is no more than 2 kinds, and both diameters do not differ 4mm; The relation of reinforcement ratio and suitable configuration reinforcement diameter is as shown in table 1 below:
Table 1
Can find out that by table 1 under low reinforcement ratio, i.e. ρ＜0.7% o'clock can only be used the HTB630 reinforcing bar of Φ 10mm; When 0.7%＜ρ＜0.9%, be fit to HTB630 reinforcing bar with Φ 10mm and Φ 12mm; 0.9%＜ρ＜1.2% o'clock is fit to the HTB630 reinforcing bar with Φ 12mm and Φ 14mm; ρ＞1.2% o'clock is fit to use Φ 14mm, the HTB630 reinforcing bar of Φ 16mm and Φ 18mm; Singly join the HTB630 reinforcing bar, the reinforced concrete structure member crevices width have some do not satisfy code requirement less than 0.3mm.
Embodiment
Present embodiment is by HRB400 reinforcing bar and HTB630 reinforcing bar mixed configuration, and crack width requires to satisfy less than 0.3mm, member section: 200mm*400mm; Protective layer thickness: 25mm; Effective depth of section: individual layer arrangement of reinforcement 365mm; Concrete: C35; Present embodiment reinforcing bar radical is less than 4, i.e. individual layer arrangement of reinforcement, and same member bar diameter kind is no more than 2 kinds; And both diameters do not differ 4mm; Real reinforcing bar one hurdle of joining in the table 2 wherein, the digital font overstriking be the HTB630 reinforcing bar, what digital font did not have overstriking is the HRB400 reinforcing bar.
The HTB630 reinforcing bar can obtain through following processing step:
(1) by the chemical analysis of steel mill by following percentage by weight:
C：0.10～0.5％，
Si：0.3～1.8％，
Mn：0.6～1.9％，
Nb：0.02～0.2％，
V：0.01～0.1％，
One or more trace alloying elements in Ni:0.01～0.2%, Cr:0.1～0.5%, Ti:0.015～0.2%, B:0.001～0.005%,
Fe: surplus,
Smelting also rolls into screwed wire rod or vertical bar;
(2) will roll good screw wire rod or vertical bar sends into heating furnace and is heated to 850～1100 ℃; Be cooled to 600～690 ℃ through cooling unit then; Water or quenching liquid carry out quenching in 5～30 seconds in quencher, are heated to 450～650 ℃ of tempering through the tempering heating furnace again;
(3) cooling processing is to normal temperature, the warehouse-in of testing at last.
The production technology of above hot-roll forming heat treatment Ribbed Bar can see patent name for details: a kind of processing method of high strong flexor ratio high-ductility steel product for prestressed concrete; Application number: 201110086374.6; The applying date: 2011-04-07, publication number: 102181798A, disclosed content.
The relation of reinforcement ratio and suitable configuration reinforcement diameter is as shown in table 2 below:
Table 2
Can find out that by table 2 reinforcement ratio is fit to the HTB630 reinforcing bar with Φ 12mm and Φ 14mm at 0.6%＜ρ＜0.9% o'clock; 0.9%＜ρ＜1.0% o'clock is fit to the HTB630 reinforcing bar with Φ 14mm and Φ 16mm; ρ＞1.1% o'clock is fit to the HTB630 reinforcing bar with Φ 18mm and Φ 20mm.Compare with table 1, the diameter of HTB630 reinforcing bar can improve a grade in same reinforcement ratio scope, promptly increase 2mm, and this is very important in engineering construction, if because the diameter of reinforcing bar is less than normal, then can increase the difficulty of construction.
HTB630 reinforcing bar and HRB400 reinforcing bar are mixed, and its ultimate bearing capacity and crack width will be with singly to join the HRB500 reinforcing bar identical, the HTB630 reinforcing bar that needs to consider and the gross area of HRB400 reinforcing bar, and the HTB630 reinforcing bar accounts for total area of reinforcement ratio.The shared ratio of HTB630 reinforcing bar is as shown in table 3 below when being mixed:
Table 3
Can know that by last table when the ultimate bending moment Mu of member is identical, when bar diameter d is identical, make crack width identical, it is about 0.454 that the HTB630 reinforcing bar accounts for total area of reinforcement ratio; If bar diameter d reduces 2mm, then to account for total area of reinforcement ratio be about 0.56～0.7 to the HTB630 reinforcing bar, and this ratio reduces along with the increase of Mu.
Except that the foregoing description, the present invention can also have other embodiments.All employings are equal to the technical scheme of replacement or equivalent transformation formation, all drop on the protection domain of requirement of the present invention.
Claims (3)
1. the high tensile reinforcement concrete component of a hybrid reinforcement comprises concrete and reinforcing bar, and said reinforcing bar, by the concrete parcel, is characterized in that around the said reinforcing bar in member as the skeleton arrangement of member:
Saidly be arranged in reinforcing bar in the member by the reinforcing bar mixed configuration of different intensity grades, said mixed configuration is selected the one or more combination of following mode:
⑴ HRB400 and with the hot rolled ribbed steel bar of subordinate and the hot rolled ribbed steel bar mixed configuration of HRB400 higher level;
⑵ HRB400 and with the hot rolled ribbed steel bar of subordinate and the hot-roll forming heat treatment Ribbed Bar mixed configuration more than the strength grade 400MPa;
⑶ HRB400 and with hot rolled ribbed steel bar and the hot rolled ribbed steel bar of HRB400 higher level and the hot-roll forming heat treatment Ribbed Bar mixed configuration more than the strength grade 400MPa of subordinate;
The reinforcing bar of said hot-roll forming heat treatment Ribbed Bar for obtaining through following processing step:
(1) is pressed the chemical analysis of following percentage by weight by steel mill:
C：0.10～0.?5%，
Si：0.3～1.8%，
Mn：0.6～1.9%，
Nb：0.02～0.2%，
V：0.01～0.1%，
One or more trace alloying elements in Ni:0.01～0.2%, Cr:0.1～0.5%, Ti:0.015～0.2%, B:0.001～0.005%,
Fe: surplus,
Smelting also rolls into screwed wire rod or vertical bar;
(2) will roll good screw wire rod or vertical bar and send into heating furnace and be heated to 850～1100 ℃, be cooled to 600～690 ℃ through cooling unit then, and water or quenching liquid carry out quenching in 5～30 seconds in quencher, are heated to 450～650 ℃ of tempering through the tempering heating furnace again;
The (3) cooling processing is to normal temperature, the warehouse-in of testing at last.
2. the high tensile reinforcement concrete component of hybrid reinforcement as claimed in claim 1; It is characterized in that: saidly be arranged in reinforcing bar in the member by the hot-roll forming heat treatment Ribbed Bar mixed configuration of the hot rolled ribbed steel bar and the strength grade 630MPa of HRB400 level, the ratio that the hot-roll forming heat treatment Ribbed Bar of said strength grade 630MPa accounts for total area of reinforcement is 0.4～0.85.
3. the high tensile reinforcement concrete component of hybrid reinforcement as claimed in claim 2, it is characterized in that: reinforcement ratio was at 0.6% < ρ < 0.9% o'clock, and selecting diameter for use is the hot-roll forming heat treatment Ribbed Bar of the strength grade 630MPa of Φ 12 mm or Φ 14mm; Reinforcement ratio was at 0.9% < ρ < 1.0% o'clock, and selecting diameter for use is the hot-roll forming heat treatment Ribbed Bar of the strength grade 630MPa of Φ 14 mm or Φ 16mm; Reinforcement ratio ρ>1.1% o'clock, selecting diameter for use is the hot-roll forming heat treatment Ribbed Bar of the strength grade 630MPa of Φ 18 mm or Φ 20mm.
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| CN2011103743318A CN102505805A (en) | 2011-11-22 | 2011-11-22 | Mixed reinforcement high-strength reinforced concrete component |
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Cited By (3)
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| CN102851476A (en) * | 2012-09-14 | 2013-01-02 | 武钢集团昆明钢铁股份有限公司 | Construction-use HPB300 hot-rolled straight steel bar and preparation method thereof |
| CN102925651A (en) * | 2012-10-26 | 2013-02-13 | 江苏天舜金属材料集团有限公司 | Heat treatment processing method for high-speed production of small-diameter, high-strength and high-plasticity steel |
| CN103924737A (en) * | 2014-04-12 | 2014-07-16 | 北京工业大学 | Reinforced concrete columns with unbonded end parts and unequal strength |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102851476A (en) * | 2012-09-14 | 2013-01-02 | 武钢集团昆明钢铁股份有限公司 | Construction-use HPB300 hot-rolled straight steel bar and preparation method thereof |
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| CN102925651A (en) * | 2012-10-26 | 2013-02-13 | 江苏天舜金属材料集团有限公司 | Heat treatment processing method for high-speed production of small-diameter, high-strength and high-plasticity steel |
| CN102925651B (en) * | 2012-10-26 | 2014-12-17 | 江苏天舜金属材料集团有限公司 | Heat treatment processing method for high-speed production of small-diameter, high-strength and high-plasticity steel |
| CN103924737A (en) * | 2014-04-12 | 2014-07-16 | 北京工业大学 | Reinforced concrete columns with unbonded end parts and unequal strength |
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Application publication date: 20120620 |