I 15-50 – I Bearing Bar

1 1/2" Thick | 50% Open

Special Order

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I 15-50 – I Bearing Bar

NOTE: These products are only available by special order. Minimum orders, extended lead times and special-order pricing will apply.

Span (inches)	CONCENTRATED LOAD in lb/ft of width								Max Load (lb/ft)	Apparent EI x 10⁶ (lb-in²)
Span (inches)	50	100	150	200	250	500	1000	2000	Max Load (lb/ft)	Apparent EI x 10⁶ (lb-in²)
12	0.001	0.001	0.002	0.003	0.004	0.007	0.015	0.029	11055	2.46
18	0.002	0.003	0.005	0.006	0.008	0.015	0.030	0.061	7370	4.00
24	0.003	0.006	0.009	0.012	0.015	0.030	0.060	0.119	5528	4.84
30	0.005	0.011	0.016	0.021	0.027	0.054	0.107	0.214	4422	5.25
36	0.009	0.018	0.027	0.036	0.045	0.089	0.178	0.356	3685	5.46
42	0.014	0.028	0.042	0.056	0.070	0.139	0.279	0.558	3159	5.53
48	0.021	0.041	0.062	0.083	0.103	0.206	0.413		2764	5.58
54	0.029	0.059	0.088	0.117	0.146	0.293	0.586		2457	5.60
60	0.040	0.080	0.120	0.160	0.200	0.401			2211	5.61
66	0.053	0.106	0.160	0.213	0.266	0.532			2010	5.63
72	0.069	0.138	0.207	0.276	0.345	0.689			1843	5.64

Span (inches)	UNIFORM LOAD in lb/ft²								Max Load (lb/ft²)	Apparent EI x 10⁶ (lb-in²)
Span (inches)	50	100	150	200	250	500	1000	2000	Max Load (lb/ft²)	Apparent EI x 10⁶ (lb-in²)
12	<0.001	0.001	0.001	0.002	0.002	0.005	0.009	0.018	13992	2.46
18	0.001	0.003	0.004	0.006	0.007	0.014	0.028	0.057	9328	4.00
24	0.004	0.007	0.011	0.015	0.019	0.037	0.074	0.149	5878	4.84
30	0.008	0.017	0.025	0.034	0.042	0.084	0.168	0.335	3486	5.25
36	0.017	0.033	0.050	0.067	0.083	0.167	0.334	0.668	2485	5.46
42	0.031	0.061	0.092	0.122	0.153	0.305	0.610		1806	5.53
48	0.052	0.103	0.155	0.206	0.258	0.516			1384	5.58
54	0.082	0.165	0.247	0.330	0.412				1091	5.60
60	0.125	0.250	0.376	0.501	0.626				886	5.61
66	0.183	0.366	0.548						730	5.63
72	0.259	0.517							614	5.64

Properties Per Foot of Width	# of Bars	Load Bar Depth	Bar Centers	Weight/sq ft
A = 3.89 in² I = 1.11 in⁴ S = 1.47 in³	10	1.5″	1.2″	3.60

1. Tables were developed in accordance with the test method developed by the Fiberglass Grating Manufacturers Council (FGMC) of the American Composites Manufacturers Association (ACMA) for the Fiberglass Grating Standard.

2. The designer should not exceed MAXIMUM RECOMMENDED load at any time. ULTIMATE CAPACITY represents MAX LOAD observed at initial fracture.

3. Walking loads for maintenance traffic are typically a live load of 50 PSF. Deflections for worker comfort are typically limited to 0.375″ (3/8″) or SPAN divided by 120 under full live load. For a firmer feel under full live load or a line load 250 lb/ft of width, limit deflections to 0.25″ (1/4″) or SPAN divided by 200.

4. The loads represented are for STATIC LOAD CONDITIONS at ambient temperature. Deflections for impact loads or dynamic loads will MULTIPLY the deflections shown by 2. Long term loads will result in added deflection due to creep in the material and will require higher factors of safety to ensure acceptable performance.

5. Deflections are limited too 0.5″ (1/2″) as recommended by the Fiberglass Grating Manufacturers Council of the American Composites Manufacturers Association.