1″ X 1″ X 4″ Rectangular Grid PROGrid Molded Grating

1" Thick | 68% Open
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Product Description Part Number Resin Color Length Location Quantity UOM  

Span (inches)

CONCENTRATED LOAD in lb/ft of width

Max
Load (lb/ft)

Apparent
EI x 106
(lb-in2)

50

100

150

200

250

500

1000

2000

12

0.004

0.008

0.012

0.016

0.020

0.040

0.079

1834

0.45

18

0.012

0.024

0.036

0.049

0.061

0.122

0.243

1419

0.50

24

0.028

0.056

0.083

0.111

0.139

0.278

0.555

961

0.52

30

0.053

0.107

0.160

0.213

0.266

0.533

769

0.53

36

0.090

0.181

0.271

0.362

0.452

641

0.54

42

0.138

0.276

0.413

0.551

0.689

549

0.56

46

0.178

0.355

501

0.57

Span (inches)

UNIFORM LOAD in lb/ft2

Max Load
(lb/ft2)

Apparent
EI x 106
(lb-in2)

50

100

150

200

250

500

1000

2000

12

0.002

0.005

0.007

0.010

0.012

0.025

0.050

0.099

3668

0.45

18

0.011

0.023

0.034

0.046

0.057

0.114

0.228

1892

0.50

24

0.035

0.069

0.104

0.139

0.174

0.347

961

0.52

30

0.083

0.167

0.250

0.333

0.416

615

0.53

36

0.170

0.339

0.509

0.679

427

0.54

42

0.301

0.603

314

0.56

46

0.430

287

0.57

Properties Per Foot of Width

# of Bars

Load Bar Width

Bar Centers

Weight/sq ft

A = 2.69 in2 I = 0.22 in4 S = 0.45 in3

12

0.25″

1″

2.61

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. MAXIMUM LOAD represents a 4:1 factor of safety on ULTIMATE CAPACITY. 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 to 0.5″ (1/2″) as recommended by the Fiberglass Grating Manufacturers Council of the American Composites Manufacturers Association.