## Tension members-part-3.

### Applicable ASTM specifications for shapes table 2-4 for various shapes-CM#15.

In the next slide, from Construction manual CM#15, for carbon steel, we have eight groups, with a new three groups added which are ASTM A709, ASTM A1043 d, and ASTM A1085.

What are the preferred material parameters based on the marked black square? A36 with Fy=36 ksi and Fu=58-80 ksi is preferred for the M, S, Mc, and L forms, as specified in building manual 14.

The hollow section group HSS consists of three items, which are rectangular HSS, round HSS, and pipe.

The preferred ASTM A for pipe is ASTM A 53 grade B with Fy=35 ksi and ultimate stress Fu=60 ksi.

For the round HSS, its preferred ASTM A has changed from ASTM A 500 grade b and becomes ASTM A 500 grade C with Fy=46 ksi and ultimate stress Fu=62 ksi with higher Fy and Fu values.

For the rectangular HSS its preferred ASTM A has changed from ASTM A 500 grade b and becomes ASTM A 500 grade C with Fy=50 ksi and ultimate stress Fu=62 ksi with higher Fy and Fu values.

The old ASTM A 500 grade b has become with gey colors.

The added ASTM A709 grade 36 with Fy=36 ksi and ultimate stress Fu has a range of 58 to 80 ksi with a symbol which stands for wide flange thickness bigger than 3 inches only the minimum 58 ksi applied.

For the added ASTM A 1043 d,k, with two grades grade 36 and grade 50.d for shape profile with a flange width of 6 inches or greater. Symbol k stands for This specification is not a prequalified base metal per AWS D1.1.

For ASTM A 1085 with grade A, the yield stress Fy=50 ksi and fu=65 ksi.

This grade is marked grey color for the HSS section.

For ASTM A 36 its yield stress is 36 ksi and the ultimate stress is Fu=58-80 ksi. The symbol b is for shapes over 426 lb/ft.

For the high strength low alloy, for the w section, it is preferred to use ASTM A992 the start yielding Fy equals 50 ksi, and ultimate stress Fu=65 ksi.

Item c shown for A529 C, is for shapes used as less or equal 11/2 inch only. The symbol d appears for ASTM 572 Gr-50, where Fy =50 ksi and Fu equals 65 ksi, but 70 ksi can be specified.

### High strength Alloy-AISC Table 2-4 for plates-CM#15.

For the high-strength alloy-AISC Table 2-4 for plates-CM#15, there is a total of six groups for Tension members-part-3.

A new ASTM A 709 was added with three grades Grade 50, grade 50s, and grade 50W.

Another ASTM A 1065k was added with three grades, grade 50i with symbol k which means that it can be considered as corrosion resistant as well with yield stress Fy=50 ksi and Fu=70 ksi it has a grey marking for a rectangular HSS section.

#### Corrosion-resistant grades in CM#15 in Table 2-4.

ASTM A 242 was removed from the corrosion-resistant table of ASTMA and a new ASTM A 1065 k was added with Fy=50 ksi and Fu=70 ksi. Symbol k stands for This specification is not a prequalified base metal per AWS D1.1 in Tension members-part-3..

This is the Grouping of the different types of steel Grades based on CM#15.

Table A3.1 from the new specification for the used ASTM A. The ASTMA list was tabulated with the corresponding yield stress in both imperial and metric included.

#### Practice problem for ASTM A24.

ASTM A 242 is specified to be used for a beam with W24x192, it is required to find the values of the yield stress Fy and Fu for the beam and the modulus of elasticity, this practice problem is given for CM#14 only. 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. It has three grades 42, 46, and 50 ksi for yield stress which are marked J,k, and l based on the flange thickness.

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

The next post-contains-Review of AISC table 2-5 for plates.

For a useful external Chapter** 3 – Tension Members**– Bartlett Quimby.