All reinforcing bars specified in the bridge plans barlist are considered to be astm a 706 bars. High strength steel in reinforced concrete columns american. Astm a706 a706m 16 standard specification for deformed. The standard sizes and dimensions of deformed bars and their number designations are given in table 1. Astm a706 materials science mechanical engineering free 30. Bars meeting astm a706 a706m are available in strength grades 41 of 60 and 80 420 and 550. Gr 60, for gr 75 grade lines must be at least 5 deformation spaces long.
A706 a706m16 standard specification for deformed and plain lowalloy steel bars for concrete reinforcement. Brief historical overview of yield strength determination in aci 318 october 20, 20 3 circa 1963 actual stress strain curves grade 75 astm a431 bars never exhibited a distinct yield point grade 60 astm a432 bars exhibited inbetween stressstrain behavior grade 40 astm a15 bars were always sharplyyielding materials 5. Rebar is an essential part of roads, buildings and infrastructures around the world. This design memorandum defines wsdot policy for the use of astm a706 grade 80 reinforcement.
Grade 60 420 grade 80 550 tensile strength, min, psi mpa 80 000 550 a. Bars meeting astm 996a996m are not as readily 42 available as the other two steel types, but type r bars are available in strength grades 43 of 50and 60 350 and 420, while type a bars are available in strength grades of 40 and 44 60 280 and 420. Steel concrete reinforcing bar from mexico and turkey. Availability of astm a 706 reinforcing has improved locally, with only a modest price increase over aashto m 31.
For grade 60 the bars must show the minimum yield strength designation, a grade mark of either the number 60 or one grade mark line. Some pdf files are protected by digital rights management drm at the request of the holder. These numbers also represent the minimum yield strength mea sured in ksi. Astm a706a706m 15 standard specification for deformed and plain lowalloy steel bars for concrete reinforcement. Confinement ties are 80 ksi while shear reinforcing is 60 ksi. A1064, a1022 is only permitted where it is wrapped around the. It is available in only one grade, grade 60 fy 60 ksi. A grade mark line is smaller than and between the two.
When welding an astm a615 grade 60 rebar or an astm a706 grade 60 rebar to an a36 plate, what gmaw electrode specification must we use. Some samples performed much better than grade 60 2. Carbonsteel bars for concrete reinforcement grades 60, 75 and 80. Black rebar a706 rebar astm a706 rebar is a specification given to lowalloy reinforcing bars in either standard lengths or coiled configurations. Our reinforcing steel conforms to astm a61518, grade 40, 60, 75, 80 or 100 or astm a70616 grade 60 or. Astm a706 rebar is a specification given to lowalloy reinforcing bars in either standard lengths or coiled configurations. Others much worse 50% of cycles to failure of grade 60 3. Astm a706a706m 16 standard specification for deformed and plain lowalloy steel bars for concrete reinforcement.
Stress strain curves for grade 60 and 80 a706 bars from manufacturer. Bars meeting astm a706 may be ordered as grade 60 or 80. Large variability in performance of grade 80 bars 1. W for weldable steel as tm a706 for raior r l m 322 astm a966 grade 420 grade 60 bars must also show a minimum yield designation grade mark of either the number 4 60 or one grade mark line continued for at least five deformation spaces. Grade 60 having a specified minimum yield strength of 60,000 psi and grade 80 having a specified minimum yield strength of 80,000 psi. Both grade 60 and grade 80 are used for longitudinal reinforcing with the configuration depending upon the most economical layout. A1064, a1022 is only permitted where it is wrapped around the element, not where the weld is being called upon to.
Astm a706 reinforcing bar andor dowel bar idot illinois. Astm a706 grade 60 reinforcement remains the preferred reinforcing steel type for wsdot bridges and structures. Astm a516 grade 60 and asme sa516 grade 60 carbon steel plate. A706 rebar astm a706 grade reinforcing bar black rebar. Advances in highstrength reinforcing bar research in the u. Guidelines for inspection and acceptance of epoxycoated. Astm a706 a706m 16 standard specification for deformed and. Astm a615 grades 40 and 60 reinforcement conforming to 6. Further research is required to establish the shape and model of the stressstrain curve, expected reinforcing strengths and strain limits for concrete components made with astm a706 grade 80 reinforcing steel. A706 is produced in limited quantities in south carolina. Steel grades according to american standards a36, a572. Pdf in the seismic design of reinforced concrete structures, the overstrength of the. Grades 60 and 80 stressstrain curves for astm a615 and a706.
Most commonly, 60 ksi reinforcing bars are used and this is normally identified by either the number 60 or a single longitudinal grade line along the bar. Note 1bars designated as grade 80 550, which were introduced in the a706 a706m 09a revision, may be outside consideration of consensus design codes and specifications. Few tests on grade 80 bars in this first study summary of findings. Astm a706 a706m 14 standard specification for deformed. Astm a 615 grade 60 reinforcing steel may be used in members where plastic hinging is expected, with the owners approval. Astm a706 grade 60 reinforcement remains the preferred reinforcement type for all wsdot bridges and structures. A706 rebar is a weldable rebar and especially recommended for capacityprotected. Reinforcement conforming to astm a706 grade 80 may be used in seismic design category sdc a for all components. Astm a673, standard position longitudinal flange mpa ksi %%.
Effect of reinforcement grade and ratio on seismic. The most commonly used grade is grade 60 fy 60 ksi, but is also available in grade 40 and grade 75. Tension resistance of steel rebar astm a706 grade 60 8,800 16,000 24,800 35,200 48,000 63,200 101,600 simpson strongtie company inc. Astm a615 and a706 specifications for steel reinforcing bars. Highstrength steel hss reinforcing steel, specifically astm a706 grade 80 550, is now permitted by the aashto lrfd bridge design specifications for use in reinforced concrete bridge components in nonseismic regions. For astm a615 grade 60 and a706 re bar, the ufc recommends r y equal to 1. In terms of performance, the focus of this paper is on the maximum lateral drifts and the tested moment capacity. The bend test requirements in a706 are even more restrictive than the aci exceptions. Minimum yield designation grade of steel grade mark grade line 40 blank no lines 50 blank no lines 60 60 1 line 75 75 2 lines 80 80 3 lines 100 100 or c a615 4 lines a615 100 100 a1035 3. Astm a706 is a rebar intended for applications requiring controlled tensile properties i. Astm a706 a706m 09 standard specification for lowalloy. Welded bar mats shall be permitted to be assembled using a615 or a706 deformed bars. Astm a706a706m15 standard specification for deformed and. Reinforcing within the shear walls is a mixture of astm a706 grade 60 and grade 80 reinforcing.
Astma706 standard specification for deformed and plain low. Jul 20, 2017 for sdcs b and c, astm a 706 grade 60 reinforcing steel shall be used in members where plastic hinging is expected. Rebar chemical requirements astm a615 astm a706 element, max % 40 60 75 60 80 carbon 0. This specification covers bars and coils in two grades, grade 60 and. Astm a706 a706m16 standard speci cation for deformed and plain lowalloy steel bars for. This rebar grade is processed in open hearths, electric furnaces, or basic oxygen furnaces and is available in numerous grades, including grade 60 and grade 80. Brief historical overview of yield strength determination in. Masteel stock a wide range of carbon steel plates according to astm a516 grade 60 and asme sa516 grade 60, ideal for boiler and pressure vessel fabrication where improved notch toughness is important. All grade 60 bars must have either grade mark line or number 60 rolled into bar surface. Astm a706a706m16 standard specification for deformed. The fabricators may also stock materials from other mills, but i would recommend specifying only those bars in elements that require a706 ductility be shown on drawings using a d, with an appropriate plan note or general note indicating the d designates the use of a706 bar in the appropriate grade.
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