>

Oct 10, 2008 · Allowable bending stress = Fy'. If you have an A36 beam with Fy'=38ksi, it likely isn't truly compact since the actual yield stress is probably higher than the minimum of 36ksi. If the actual yield stress exceeded 38 ksi, then you wouldn't have a compact section, but you still assume the 36ksi and use it as a compact section and it is conservative.

If the calculations follow the typical design method and the only difference is Fy' is it an issue? RC All that is necessary for the triumph of evil is that good men do nothing. Edmund BurkeWas he using 50 KSI steel? Was it laterally braced??Did he actually specify that he was using Fy'? Or did he use a stress that just happened to be that number?I need to clarify a couple things. The beam was an HP 10x42. AISC 9th edition lists Fy' as 29.4 ksi. The steel was A36 steel. He actually substituted Fy' = 29.4ksi for Fy and made the allowable stress = 0.66(29.4ksi). The beam I believe was not laterally braced in any appreciable way.Something to do with the HP being non-compact?If I remember correctly, Fy' is the value of Fy for which anything less than that the section can be considered compact (i.e. Fy<Fy' means a compact section). The section would still need to be braced appropriately (which you didn't seem to think it was), and if it is there is nothing wrong with doing what he did. I've actually heard a QA/QC head at a large/prestigious firm that they teach their young engineers to do this. This was before the 13th edition was prevalent and the 9th edition was still widely used.I suppose the idea is that if the yield stress was 29.4 ksi, then the member would be compact and would be okay for that stress, and that therefore it ought to be good for that same stress even if the yield is higher. But I'm not sure why you'd do it that way. F1-3 would give a higher allowable stress.Suggest that you ask the Engineer if the HP is "used". Lowering Fy' may be his way addressing the possibility that the member is not in "new" condition. See my comments in your post thread507-227886 Steel beam design HP sections are often used by Bridge Contractors for temporary structures for at least two reasons, the first one is obvious, the second one is subtle 1. Over time a Bridge Contractor will end up owning a lot of HP that he did not need, or were cutoffs. 2. Temporary structures will have to be removed (wrecked). The Contractor's objective is to do this with the least amount of damage to his temporary structural members (so they can be reused). Removal often means pulling one the members "sideways" (the y-axis). As you know, HP have significant y-axis section modulus because of the very wide flanges. An HP will successfully withstand y-axis loading that would functionally destroy a typical W section. SlideRuleEra.net VacuumTubeEra.netI'm pretty sure the HP was "used." Still, in my opinion there would be no reason to take Fy anything less than 36ksi. The determination of the allowable stress for whatever situation (bending, compression, shear, tension) as identified in the specs of the AISC manual takes into account variations in material quality, construction tolerances, etc. What he did didn't hurt anything and wouldn't but I don't think there was really any good reason to use Fy less than 36ksi.The reason was to get away from calc'ing an allowable bending stress and just using the generic 0.66Fy. I'm not saying that calc'ing the actual allowable bending stress is difficult, but there's not much that is easier than 0.66*Fy. Additionally, to look at the true behavior I don't see this as much different than any other beam. If you have an A36 beam with Fy'=38ksi, it likely isn't truly compact since the actual yield stress is probably higher than the minimum of 36ksi. If the actual yield stress exceeded 38 ksi, then you wouldn't have a compact section, but you still assume the 36ksi and use it as a compact section and it is conservative. I see no difference between the two.Allowable bending stressAug 23, 2010Anchor Bolts A36 or A307?Apr 28, 2006See more resultsJun 07, 2014 · Re Allowable Stress for ASTM A36 steel. of course there are correct answer(s). However, the exam uses LRFD not ASD. Prof Thad rounded up from 21.6 (0.6*36) to 22 ksi. 24 ksi is bending stress for compact sections. 21.6 ksi if for compact sections that are not braced often enough to quality for 24 ksi.

Divide the yield strength by the factor of safety to calculate the allowable stress. For example allowable stress of A36 steel = 36,000 psi / 4.0 = 9,000 pounds per square inch. Greg Holladay has been writing technology articles for Bukisa since 2008. He is a certified line technician and has over five years experience in the aviation industry.

The allowable bending stress for a compact braced section of A36 steel is normally assumed to be 24 ksi and has a yield strength of 36,000 pounds psi. Top 10 questions Math, Chemistry, Physics.

ASTM A36 Steel Plate. ASTM A36 significantly offers a yield strength of 36,000 psi and an allowable bending stress of 22,000 psi. The properties of ASTM A36 steel allows it to deform steadily as stress is increased beyond its yield strength in order to allow the buildings to stand long enough after the find out here now limits...

Allowable Shear Stress of A36 Steel. By Matthew Munoz ; Updated April 12, 2017. The American Society for Testing and Materials, or ASTM, is an organization that standardizes specifications for materials, systems and equipment worldwide. One such standard involves steel. ASTM A36 is a standard for a certain type of carbon structural steel.

ASTM A36 Steel Properties. ASTM A36 has a yield strength of 36,000 psi and an allowable bending stress of 22,000 psi. The properties of ASTM A36 steel allow it to deform steadily as stress is increased beyond its yield strength. This ductility allows buildings to stand long after the limits of a structure have been met in an emergency,...

combined stress in steel design C v = web shear coefficient d = name for depth ... = allowable bending stress F cr = flexural buckling stress F e = elastic critical buckling stress F p ... the American Institute of Steel Construction, and uses Allowable Stress Design and Load and Factor Resistance Design.

ASTM A36 Steel, bar Categories Metal; Ferrous Metal; ASTM Steel; Carbon Steel; Low Carbon Steel. Material Notes Steel for general structural purposes including bridges and buildings. Key Words UNS K02600 Vendors No vendors are listed for this material.

-For A36 steel the allowable bending stress is 24ksi from Table 10.2.-Finding required section modulus S = M/F b S – (127)(12/24) S – 63.5in3-Note value of 127ft-kips had to be converted to in-kips to work with the value of 24ksi and yield an answer in cubic inches for the section modulus

Calculating the Allowable Bending (Flexural) Capacity in a Member. Z x is similar to the Section Modulus of a member (it is usually a minimum of 10% greater than the Section Modulus) (in 3) Fb = The allowable stress of the beam in bending Fy = The Yield Strength of the Steel (e.g. 36 ksi, 46 ksi, 50 ksi) Ωb = The Safety Factor for Elements in Bending = 1.67.

2) Compare the stress acting on a beam to the Allowable Stress The more common way to solve for the allowable bending in a steel beam is to check the beam against its allowable stress. Reworking the equation in Section 1 above you can come up with:

An A-36 steel strip has an allowable bending stress of 165 MPa The modulus of elasticity for A-36 steel is 200 GPa. (Figure 1) If it is rolled up, determine the smallest radius r of the spool if the strip has a width of 14.5 mm and a thickness of 1.5 mm. Express your answer to three significant figures and include the appropriate units.

Stress Strain Curve - Steel - Google. The allowable bending stress is 60 percent of an alloy's yield limit. So, ASTM A36 has an allowable bending stress of 22,000 pounds per square inch, ASTM A441 has an allowable bending stress of 24,000 to 30,000 pounds, and ASTM A572 has an allowable bending stress of . ASTM A36 (SS400, S275) Structural ...

Weak axis bending of A36 plate 2. If you convert Equation (F11-1) from AISC 360-10 to a stress-based format for weak-axis bending of a plate, the allowable bending stress is 0.90Fy. As DaveAtkins pointed out, this compares to 0.75Fy from the 9th edition AISC …

Structural Steel Design Design of steel beam (ASD, Allowable Stress design) Design code AISC Allowable Stress Design 9 th edition, 1989.. Design requirements. Maximum bending stress, f b must not exceed allowable stress, F b.. Deflection should not exceed allowable limit.

ASTM A36 Steel, bar Categories Metal; Ferrous Metal; ASTM Steel; Carbon Steel; Low Carbon Steel. Material Notes Steel for general structural purposes including bridges and buildings. Key Words UNS K02600 Vendors No vendors are listed for this material.

Example #1 Given an A36 W-member that is compact and properly braced, with a Plastic Section Modulus of 41 in3 find the allowable Moment. Note that A36 steel has a yield strength of 36 ksi and then 1) Take Mn = Fy * Zx = 36 ksi * 41 in3 = 1476 k-in.

Feb 17, 2017 · SteamKing. This is your first mistake. A36 steel has a minimum tensile strength of 36,000 psi. In shear, the allowable stress is much lower, typically 0.4 * 36,000 = 14,400 psi, which allows vagaries of shear stress distribution, provides for a minimal factor of safety on the load, etc. Even in bending, which provides partial tensile loads,...

Heat treatment methods and performances for A36 steel plate. ASTM A36 steel plate is subjected to the normalization treatment at 899°C to 954°C that is at 1650°F to 1750°F, to annealing treatment at 843°C to 871°C that is at 1550°F to 1600°F, to stress relieving process at 677°C to 927°C that is at 1250°F to 1700°F, to carburizing process at 899°C to 927°C that is 1650°F to 1700°F and to hardening process …

ASME Code - Allowable Stresses. Stress Values- Section II, Table 1A; ... the carbide phase of carbon steel may be converted to graphite. See Nonmandatory Appendix A, A – 201 and A – 202. ... A factor of 0.85 has been applied in arriving at the maximum allowable stress values in tension for this material. Divide tabulated values by 0.85 for ...

Jan 12, 2008 · I wanna know what is the allowable stress on the A36 grade mild steel plate structure? ... Rating Newest Oldest. Best Answer allowable stress 2/3 of yield strength or about 1/4 of ultimate tensile strength Ultimate tensile strength, 58-80ksi 400-550 MPa ... The usual authority for structural steel stress limits is the American ...

Status ResolvedA36 steel is one of the most widely used grades of steel plate. Chapel Steel stocks a wide range of sizes in all of our warehouses. ASTM A36 has a yield strength of 36,000 psi and an allowable bending stress of 22,000 psi. The properties of ASTM A36 steel allow it to deform steadily as …

The maximum fiber stress in bending for laterally supported beams and girders is F b = 0.66F y if they are compact, except for hybrid girders and members with yield points exceeding 65 ksi (448.1 MPa). F b = 0.60F y for non-compact sections. F y is the minimum specified yield strength of the steel, ksi (MPa). Table lists values of F b for two grades of steel.

Extracts from B.S. 499 and C.P. 112 are reproduced by permission of the British Standards Institution. Complete copies of the standard can be obtained from them at …

If the actual bending stress is greater than the allowable bending stress, is it safe? Is permissible stress and tensile strength the same? How is the allowable stress of steel determined?