EP0451798B1 - Betonrippenstahl mit kaltgewalzten Schrägrippen - Google Patents
Betonrippenstahl mit kaltgewalzten Schrägrippen Download PDFInfo
- Publication number
- EP0451798B1 EP0451798B1 EP91105623A EP91105623A EP0451798B1 EP 0451798 B1 EP0451798 B1 EP 0451798B1 EP 91105623 A EP91105623 A EP 91105623A EP 91105623 A EP91105623 A EP 91105623A EP 0451798 B1 EP0451798 B1 EP 0451798B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- rib
- ribs
- concrete reinforcing
- steel according
- ribbed steel
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
- E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
- E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
- E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
- E04C5/03—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance with indentations, projections, ribs, or the like, for augmenting the adherence to the concrete
Definitions
- the invention relates to a reinforcing steel bar with a carbon content of 0.05 to 0.24% by weight and a manganese content of 0.2 to 1.2% by weight, which has cold-rolled helical ribs without the formation of a longitudinal rib in the form of at least two , are arranged in the direction of the longitudinal axis of the rib rows.
- the previously used ribbed reinforcing steels have, in addition to the yield point, the elongation at break A10 or A5 as well as a rib geometry which ensures a sufficient bond with the concrete.
- a reinforcing steel bar for a linear design method which discloses a reinforcing steel bar, which has a carbon content of 0.15% by weight and cold-rolled helical ribs that are arranged without forming a longitudinal rib in the form of three rows of ribs running in the direction of the longitudinal axis of the bar.
- the angle of inclination of the helical ribs with respect to the rod axis is between 40 ° and 60 °
- the rib spacing c of neighboring helical ribs in a row (c / d s ) which is based on the nominal rod diameter d s , is between 0.66 and 1.0
- that at the rib height h rib spacing c (c / h) in the center of the rib lies between 8.7 and 13.3.
- EP-A 0 306 878 discloses a rebar with a manganese content of 1.04% by weight.
- a concrete rib steel which has a number of lower inclined ribs between two high inclined ribs, the greatest height of each individual rib being at least 0.03 times the rod diameter in the case of reinforcing steel and at least 0.02 times the rod diameter for prestressing steel.
- the oblique ribs are inclined at 15 ° to 65 ° with respect to the longitudinal axis of the bar. It is considered advantageous to choose the inclination of the high ribs with respect to the longitudinal axis less than that of the lower ribs.
- This configuration of the inclined ribs is aimed at a lower explosive effect, a lower sensitivity to notching and a lower sensitivity to the consequences of the settling process of the fresh concrete.
- the high ribs which are far apart, ensure a sufficiently rigid anchoring, the low ribs have a favorable effect on reducing the explosive effect.
- the total twist corresponds to the curvatures in the fracture state added up over the length of the beam and thus to the twists of the end cross-sections measured in tests on the single-span beam.
- the beam is loaded up to the yield point and the curvatures are added up over the length of the beam.
- the plastic twist includes the additional curvatures that occur after the yield point torque is exceeded until the beam breaks.
- Fig. 1 the influence of the uniform expansion A g on the twistability is shown.
- the length of a beam resting on the ends is plotted on the X-axis and the curvature on the Y-axis.
- the dashed curve represents the conditions for a steel 1 with a uniform expansion A g of 2% and the solid line shows the relationships for a steel 2 with a uniform expansion A g of 5%. It can be seen that with an increase in the uniform expansion the torsionability is significantly increased.
- the diagram also shows the rotation angles ⁇ of the joint rotation for the two cases.
- Fig. 2 shows the influence of the steel characteristic on possible torque redistribution depending on the ratio of tensile strength / yield strength. It can also be seen here that if this ratio is increased, the sum of traffic and own load can be increased significantly.
- Fig. 3 the elongation ⁇ of a reinforcing bar on a concrete crack is shown depending on the bond.
- the solid line characterizes a hard bond, as is the case with high ribs, which run almost perpendicular to the rod axis and are at a large distance from one another, the elasticity of the reinforcing steel bar being limited to the area of the crack;
- the dotted line characterizes a soft bond in which the tensile strength and the deformation of the reinforcing steel are not limited to the area of the crack, since the concrete is more easily detached from the steel when the tension on the two crack banks increases. This creates a larger free stretch length.
- the bond behavior of reinforcing steels is usually described by specifying a value for the related fin area f R. This value records the bond behavior only for the elastic range of the stress-strain line of the steel.
- the influence of rib height and rib spacing on the blasting effect, ie on an early bond failure due to shifts between steel and concrete, is not taken into account.
- the relative displacements between steel and concrete can no longer be disregarded.
- the rib geometry must be designed in such a way that the greatest possible relative displacements between steel and concrete can occur while avoiding an explosive effect.
- the object of the invention is to make available a reinforcing steel bar which is distinguished from known cold-ribbed reinforcing bars by a higher uniform elongation, a greater ratio of tensile strength / yield strength and a softer bond.
- the concrete should not be blown off.
- the straightening ability of the rod by means of straightening rollers should be improved.
- the concrete rib steel according to the invention is characterized by the features of claim 1. Advantageous embodiments of this rebar are to be found in the subclaims.
- the rib steel according to the invention is particularly suitable as a reinforcement element for reinforced concrete components which are dimensioned using local plastic deformations (joint rotation ⁇ ) of the reinforcement.
- the rib spacings c and the angle of inclination ⁇ of the ribs with respect to the rod axis are reduced in comparison to known cold-rolled concrete rib steels.
- the material flow during the application of the ribs is favored by cold deformation, so that the deformation effort for producing the final cross section can be reduced.
- the result is an improvement in the elongation and the ratio of tensile strength / yield strength.
- a softer bond is achieved due to this rib geometry and a maximum relative displacement between steel and concrete can be achieved without the concrete breaking off.
- Reinforced concrete steels which are designed with 2.3 or more rows of ribs according to this rib geometry, have an almost circular envelope, which simplifies the straightening process customary in cold-rolled steels and also significantly reduces the noise level associated with straightening.
- the reinforcing ribs according to the invention are preferably used as rods or wires of reinforcing steel mesh.
- the cold-ribbed reinforcing steel 1 shown in FIGS. 4 to 6 has an approximately circular core cross-section 2 shown hatched in FIG. 5, as well as 3 rows of ribs 3, 4 and 5 distributed around the circumference, the parts of a thread for screwing on one with a counter thread provided anchoring or connecting body.
- the ribs 3, 4 and 5 formed in the same way, as shown in FIG. 5, extend in full over almost a third of the rod circumference.
- the rows of ribs run parallel to the bar axis 6.
- the geometrical sizes of the ribs for concrete rib steels with a nominal diameter of 4 to 16 mm are: d p c c / ds H c / h Angle ⁇ f R 4th 4.0 1.0 0.25 16 30 ° to 40 ° 0.038 5 4.0 0.8 0.30 13.3 30 ° to 40 ° 0.043 6 4.0 0.67 0.31 12.9 30 ° to 40 ° 0.048 7 4.0 0.57 0.34 11.8 30 ° to 40 ° 0.051 8th 4.1 0.513 0.38 10.8 30 ° to 40 ° 0.055 8.5 4.3 0.505 0.40 10.75 30 ° to 40 ° 0.056 10th 5.1 0.51 0.51 10.0 30 ° to 40 ° 0.060 11 5.0 0.455 0.53 9.43 30 ° to 40 ° 0.063 12th 5.5 0.458 0.60 9.17 30 ° to 40 ° 0.065 14 6.0 0.43 0.65 9.23 30 ° to 40
- the angle of inclination ⁇ of the rib flanks in old degrees is preferably in the range of 40 ° ⁇ ⁇ 60 °, the ratio of the base width b of the ribs to the rib height h should be in the range 1.5 ⁇ b / h ⁇ 3.3.
- Fig. 7 the developments of a known and a concrete rib steel according to the invention for each row of ribs are shown schematically.
- the known rib steel on the left is based on an inclination angle ⁇ of 50 ° and a rib spacing of c / d s based on the rod diameter of approximately 1.00.
- the suitability for that Straightening of the rod is greater the closer its outer contour approaches that of a cylindrical body.
- the rib geometry of the steel according to the invention is optimally designed with regard to this requirement, namely by an angle of inclination of the inclined ribs to the rod axis in the range between 30 ° and 40 °. Also by reducing the fin height h and the fin spacing c compared to known cold-rolled steels.
- the steels have a yield strength ratio R m / R e of 1.06 to 1.08, the uniform elongation A g is between 2.8 and 3.6%.
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
- Rod-Shaped Construction Members (AREA)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE4011486A DE4011486A1 (de) | 1990-04-09 | 1990-04-09 | Betonrippenstahl mit kaltgewalzten schraegrippen und dessen verwendung |
DE4011486 | 1990-04-09 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0451798A2 EP0451798A2 (de) | 1991-10-16 |
EP0451798A3 EP0451798A3 (en) | 1992-12-02 |
EP0451798B1 true EP0451798B1 (de) | 1995-09-27 |
Family
ID=6404087
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP91105623A Expired - Lifetime EP0451798B1 (de) | 1990-04-09 | 1991-04-09 | Betonrippenstahl mit kaltgewalzten Schrägrippen |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0451798B1 (da) |
AT (1) | ATE128507T1 (da) |
DE (2) | DE4011486A1 (da) |
DK (1) | DK0451798T3 (da) |
Families Citing this family (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4400974A1 (de) * | 1994-01-14 | 1995-07-20 | Inst Stahlbeton Bewehrung Ev | Betonstahl |
US5889411A (en) * | 1997-02-26 | 1999-03-30 | Xilinx, Inc. | FPGA having logic element carry chains capable of generating wide XOR functions |
US5963050A (en) | 1997-02-26 | 1999-10-05 | Xilinx, Inc. | Configurable logic element with fast feedback paths |
US6201410B1 (en) | 1997-02-26 | 2001-03-13 | Xilinx, Inc. | Wide logic gate implemented in an FPGA configurable logic element |
US6204689B1 (en) | 1997-02-26 | 2001-03-20 | Xilinx, Inc. | Input/output interconnect circuit for FPGAs |
US5920202A (en) * | 1997-02-26 | 1999-07-06 | Xilinx, Inc. | Configurable logic element with ability to evaluate five and six input functions |
US5914616A (en) * | 1997-02-26 | 1999-06-22 | Xilinx, Inc. | FPGA repeatable interconnect structure with hierarchical interconnect lines |
DE10105667A1 (de) * | 2001-02-08 | 2002-09-26 | Badische Stahlwerke Gmbh | Betonstahl mit Rippen, Stahlbeton |
FR2919639B1 (fr) * | 2007-07-30 | 2009-11-13 | Ugitech | Fil crante pour armature de structure en beton, en acier inoxydable duplex. |
CN107803629B (zh) * | 2017-10-27 | 2021-04-13 | 阳春新钢铁有限责任公司 | 一种提高螺纹钢力学性能的方法 |
Family Cites Families (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
AT193914B (de) * | 1954-06-02 | 1957-12-10 | Oesterr Alpine Montan | Stahl für Bewehrungszwecke im Bauwesen |
DE1609638A1 (de) * | 1966-01-04 | 1970-07-30 | Filiton Ag | Bewehrungsstab fuer den Stahlbetonbau |
DE2063451B2 (de) * | 1970-12-23 | 1974-07-11 | Stahlwerke Peine-Salzgitter Ag, 3150 Peine | Verwendung eines warmgewalzten Betonrippenbaustahles für Baustahlmatten |
DE2123818B2 (de) * | 1971-05-13 | 1979-08-16 | Helmut 4224 Huenxe Dickmann | Verfahren und Vorrichtung zum Herstellen eines gerippten Betonbewehrungsstabs |
DE2231354A1 (de) * | 1972-06-27 | 1974-01-10 | Moossche Eisenwerke Ag | Bewehrungsstab fuer stahlbeton |
DE2233788C3 (de) * | 1972-07-10 | 1984-09-13 | Badische Stahlwerke AG, 7640 Kehl | Schweissbarer naturharter betonstahl mit einer mindeststreckgrenze von 50kp/mm hoch 2 |
JPS521918A (en) * | 1975-06-23 | 1977-01-08 | Kobe Steel Ltd | Special form steel bar for strengthening concrete |
DE2622524A1 (de) * | 1976-05-20 | 1977-11-24 | Janovic Kassian Anton Dipl Ing | Gerippter betonstahl und spannstahl |
DE2821902C3 (de) * | 1978-05-19 | 1982-02-04 | Dyckerhoff & Widmann AG, 8000 München | Betonbewehrungsstab, insbesondere Spannstab |
DD221759B1 (de) * | 1984-02-28 | 1989-05-03 | Florin Stahl Walzwerk | Betonstahl warmgewalzt und thermisch verfestigt |
DE3705722A1 (de) * | 1986-12-19 | 1988-07-07 | Hiendl Heribert | Bewehrungsanschluss |
DE3730489A1 (de) * | 1987-09-11 | 1989-03-30 | Dyckerhoff & Widmann Ag | Betonbewehrungsstab, insbesondere betonrippenstab |
DE3730490A1 (de) * | 1987-09-11 | 1989-03-23 | Dyckerhoff & Widmann Ag | Warmgewalzter betonbewehrungsstab, insbesondere betonrippenstab |
DD268258A1 (de) * | 1988-01-08 | 1989-05-24 | Florin Stahl Walzwerk | Hoeherfester stahl, insbesondere betonstahl bzw. ziehereivormaterial, mit verbesserten werkstoffeigenschaften und besserer verarbeitbarkeit |
DE3816930A1 (de) * | 1988-05-11 | 1989-11-23 | Heribert Hiendl | Rueckbiegefaehiger betonstahl |
-
1990
- 1990-04-09 DE DE4011486A patent/DE4011486A1/de not_active Withdrawn
-
1991
- 1991-04-09 DE DE59106565T patent/DE59106565D1/de not_active Expired - Fee Related
- 1991-04-09 DK DK91105623.2T patent/DK0451798T3/da active
- 1991-04-09 AT AT91105623T patent/ATE128507T1/de not_active IP Right Cessation
- 1991-04-09 EP EP91105623A patent/EP0451798B1/de not_active Expired - Lifetime
Non-Patent Citations (1)
Title |
---|
Beton-Kalender 1988, Ernst und Sohn, Seiten 180, 181, 198, 199 * |
Also Published As
Publication number | Publication date |
---|---|
EP0451798A2 (de) | 1991-10-16 |
EP0451798A3 (en) | 1992-12-02 |
DE59106565D1 (de) | 1995-11-02 |
DK0451798T3 (da) | 1996-01-15 |
DE4011486A1 (de) | 1991-10-10 |
ATE128507T1 (de) | 1995-10-15 |
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