The Unistrut P4101 back-to-back channel has dimensions of 1-5/8″ x 1-5/8″ and a 14 ga (.075″) wall. It is shorter than the P3301.
| Elements of Section – P4101 | ||
| Area of Section | 0.579 in2 (3.7 cm2) | |
| Axis 1-1 | Axis 2-2 | |
| Moment of Inertia (I) | 0.117 in4 (4.9 cm4) | 0.214 in4 (8.9 cm4) |
| Section Modulus (S) | 0.143 in3 (2.3 cm3) | 0.264 in3 (4.3 cm3) |
| Radius of Gyration (r) | 0.449 in(1.1 cm) | 0.608 in(1.5 cm) |
| Column Loading – P4101 Unbraced Height (in) Allowable Load at Slot Face (lbs) Max Column Load Applied at C.G. K=0.65 (lbs) K=0.80 (lbs) K=1.0 (lbs) K=1.2 (lbs) 24 3,240 12,370 11,950 11,370 10,540 36 3,120 11,470 10,540 9,160 7,720 48 2,940 10,090 8,680 6,770 4,980 60 2,680 8,560 6,770 4,590 3,190 72 2,310 7,010 4,980 3,190 2,220 84 1,950 5,530 3,660 2,340 * 96 1,650 4,250 2,800 * * 108 1,410 3,360 2,220 * * *KL/r > 200 |
| Beam Loading – P4101 | ||||||
| Span (in) | Max Allowable Uniform Load (lbs) | Defl at Uniform load (in) | Uniform Loading at Deflection | Lateral Bracing Reduction Factor | ||
| Span /180 (lbs) | Span /240 (lbs) | Span /360 (lbs) | ||||
| 24 | *1,090 | 0.06 | *1,090 | *1,090 | *1,090 | 1.00 |
| 36 | 800 | 0.14 | 800 | 800 | 570 | 1.00 |
| 48 | 600 | 0.25 | 600 | 480 | 320 | 1.00 |
| 60 | 480 | 0.39 | 410 | 310 | 200 | 0.96 |
| 72 | 400 | 0.57 | 280 | 210 | 140 | 0.92 |
| 84 | 340 | 0.76 | 210 | 160 | 100 | 0.89 |
| 96 | 300 | 1.00 | 160 | 120 | 80 | 0.85 |
| 108 | 270 | 1.29 | 130 | 90 | 60 | 0.81 |
| 120 | 240 | 1.57 | 100 | 80 | 50 | 0.78 |
| 144 | 200 | 2.26 | 70 | 50 | 40 | 0.71 |
| 168 | 170 | 3.05 | 50 | 40 | 30 | 0.64 |
| 192 | 150 | 4.02 | 40 | – | – | 0.57 |
| 216 | 130 | 4.96 | – | – | – | 0.50 |
| 240 | 120 | 6.28 | – | – | – | 0.45 |
| *Load limited by weld shear | ||||||
Notes:
- Above loads include the weight of the member. This weight must be deducted to arrive at the net allowable load the beam will support.
- Long span beams should be supported so as to prevent rotation and twist.
- Allowable uniformly distributed loads are listed for various simple spans, that is, a beam on two supports. If load is concentrated at the center of the span, multiply load from the table by 0.5 and corresponding deflection by 0.8.
- The lateral bracing factor should be multiplied by the load to determine the load retained based on the distance between lateral braces.
