U.S.A Access Cover and Frame Loading Test

AASHTO (American Association of State Highway and Transportation Officials ) Standard Specifications for Highway Bridges. 

H-20 and HS-20 :A 40,000 pound proof load concentrated on a nine inch by nine inch square area and held for one minutes. The 40,000lbs. proof load respresents a safety factor of 2.5 for H-20 and HS-20 loading.

H-25 and HS-25 : A 50,000 pound proof load concenrated on a nine inch by 22 nine inch square area and held for one minute. The 50,000lbs. proof load represents a safety factor of 2.5 for H-25 and HS-25 loading.

Test Procedure

1.Test specimen is placed in the hydraulic test press and the 9 in.by 9 in.test foot print is centered on the specimen.

2.Pressure is aplied to the specimen until the desired test load is achieved. The test load is then maintained for 60 seconds.

3.Upon removal of the load, the cover and frame shall be examined for cracks or detrimental permanent deformation. Permanent deformation shall not exceed 3.2mm.

4.Test specimen is then removed from the press and examined for any detrimental deformation.

5.Test specimen is then placed back into test press and loaded to full destructive failure-destructive test loading available upon request.

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