1C- Best and Full illustration of Aisc Table 2-4.

Last Updated on October 20, 2024 by Maged kamel

Table Of Contents

AISC Table 2-4 for various steel elements.
AISC Table 2-4 for various structural shapes-CM#15-CM#16.

AISC Table 2-4 for various steel elements.

Carbon steel-AISC Table 2-4 for various structural shapes-CM#14.

Carbon steel is classified into five categories, beginning with ASTM A36, ASTM A53 Grade B, and ASTM A500, which includes two grades: B and C.
ASTM A501 has grades A and B, followed by ASTM A 592 C, which has grades 50 and 55.
What are the preferred material parameters based on the marked black square?
A36 with Fy=36 ksi and Fu=58-80 ksi is ideal for M, S, Mc, and L shapes.

The preferred ASTM A for pipe is ASTM A 53 grade B, with Fy=35 ksi and ultimate stress Fu=60 ksi.
For round HSS, the preferred ASTM A is ASTM A 500 grade B with Fy=42 ksi and ultimate stress Fu=58 ksi.
For rectangular HSS ASTM A 500 grade B, Fy=46 ksi and ultimate stress Fu=58 ksi.

The gray squares are for other potential grades and can be utilized if requested. This comprises ASTM A500 grade C and ASTM A501 grades A and B for HS sections.
The white square for the material specification is not applicable.

High strength-alloy steel-CM#14.

There are four groups, including ASTM A 572, with five grades for the high-strength alloy. Grade 50 is preferred for the HP section, with yield stress Fy=50 ksi and fu=65 ksi. We have the symbol d, meaning a maximum tensile strength of 70 ksi can be specified.

Also, we have symbol e for grades 60 and 65, for which grade 60 has yield stress Fy=60 ksi and ultimate stress Fu=60 ksi.

While grade 65 has a yield stress of Fy=65 ksi and ultimate stress of Fu=65 ksi, E is for flange thicknesses of less than or equal to 2 inches.

ASTM A 618 f, with grade I and grade ii, with yield stress Fy=50 ksi and Fu=70 ksi, the symbol f stands for it can be specified as corrosion resistant.

ASTM A-913 comes in four grades; the first grade is 50 with Fy=50 ksi with symbol g, which indicates that the minimum Fy of 50 ksi is to be applied with walls nominally ¾ inches and Fu=60 with symbol h, which states that the ultimate stress can be raised to 65 ksi and a maximum yield to tensile stress strength ratio of 0.85 can be specified.

ASTM A 992, preferred for the W section, has yield stress Fy=50 ksi and ultimate stress Fu=65 ksi. Its symbol I stands for maximum yield to tensile stress strength ratio of 0.85. The carbon equivalent formula is mandatory in ASTM A992.

Corrosion-resistant high strength low alloy for various structural shapes-CM#14.

There are three categories of corrosion-resistant high-strength low alloys: ASTM A 242, grades 42, 52, and 60, and ultimate stress Fu from 63 to 70 ksi.

We have symbols J, K, and L. The symbols J, K, and L are related to shapes with flange thickness. J is for flanges with a thickness greater than 2 inches only. Please refer to the next slide.

The specified Fy equals 42 ksi, and the ultimate stress is 63 ksi. For K for the flange, the thickness is >1.5 inches and less than or equal to 2 inches only. The specified Fy equals 46 ksi, and the ultimate stress is 67 ksi.

L is for flanges with a thickness of less than or equal to 1.50 inches. The specified Fy equals 50 ksi, and the ultimate stress is 70 ksi. The second group is for ASTM A 588, with Fy=50 Ksi and Fu=70 ksi.

ASTM A572 contains five classes, ranging from 42 to 65; hence, the required grade must be given. The Fy and fu were chosen based on the flange thickness in the next slide.

Practice problem, for ASTM A242.

ASTM A 242 is specified for a beam with W24x192; it is required to find the yield stress Fy and Fu values for the beam and the modulus of elasticity; this practice problem is only given for CM#14. As a reminder, A242 was used as corrosion resistant in tables 2-4 and later removed from CM#14 for corrosion resistance; it was available for the W section and has a grey color.

Now, it is used for plates. Based on the flange thickness, it has three yield stress grades: 42, 46, and 50 ksi, marked J,k, and l.

Based on Table 1-1, the flange thickness is 1.46 inches, less than 1.50 inches; we will select grade 50 category L, and the ultimate stress Fu is 70 ksi. The modulus of elasticity is 29×10^6 psi.

The second part of the solved problem is shown in the next slide.

AISC Table 2-4 for various structural shapes-CM#15-CM#16.

I have included a snapshot of Table 2-4 to quickly review the main difference between CM #14 & CM #15. The carbon steel categories have increased to 8 items, and the HSS sections have also changed.