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AISC 360-10 - Chapter H

Eng: BMS

Date: 4/10/13

H3. MEMBERS SUBJECT TO TORSION

Project:

AND COMBINED TORSION,FLEXURE,

SHEAR AND/OR AXIAL FORCE

SECTION:

HSS 12X6X1/4

Variables

Φ.t 0.90 :

E 29000 ksi * :

h 11.3005 in * :

B 12 in * :

>overall width

F.y 46 ksi * :

t 0.233 in * :

H 6 in * :

>overall height

h t / 48.5

H3.1 Rectangular HSS Subject to Torsion

h t / 2.45 E F.y / sqrt * ≤ F.cr 0.6 F.y * : 2.45 E F.y / sqrt * h t / < 3.07 E F.y / sqrt * ≤ F.cr 0.6 F.y * 2.45 E F.y / sqrt * (* h t / (/ : 3.07 E F.y / sqrt * h t / < 260 ≤ F.cr 0.458 π 2^* E * h t / (2^/ : NA if if if

(H3-3)

(H3-4)

(H3-5)

F.cr ksi 27.6

User Note:

The torsional constant,C, may be conservatively taken as:

C 2 B t - (* H t - (* t * 4.5 4 π - (* t 3^* - :

C in 3^31.57

C 31.6 in 3^* :

T.n F.cr C * :

(H3-1)

Φ.t T.n * kip ft * 65.41

T.c Φ.t T.n * :

H3.2 HSS Subject to Combined Torsion, Shear,

Flexure, and Axial Force

P.r 0 kip * :

>required axial strength LRFD, kips

P.c 90.3 kip * :

>ΦPn design tensile or compressive strength Chapter D or E, kips

M.r 5 kip * ft * :

>required flexural strength LRFD, kip-in

M.c 107 kip * ft * :

>ΦbMn design flexural strength Chapter F, kip-in

V.r 5 kip * :

>required shear strength LRFD, kips

V.c 10 kip * :

>ΦvVn design shear strength Chapter G, kips

T.r 5 kip * ft * :

>required torsional strength LRFD, kip-in

T.c kip ft * 65.41

>ΦtTn design torsional strength Section H3.1, kip-in

P.r P.c / M.r M.c / + (V.r V.c / T.r T.c / + (2^+ 0.38

≤ 1.0