What does H20 loading mean?
H-20 loading, also known as HS-20 loading, is the design criteria of the American Association of State Highway Transportation Officials, or AASHTO. It “means” a truck axle loading of 32,000 pounds or wheel loading of 16,000 pounds.
What is the difference between H20 and HS20 loading?
The only difference in these two vehicles is that the “HS20” truck has an additional 32,000-pound axle located under the trailer, which is separated by a minimum distance of 14′ – for a total load of 72,000 pounds. An “H20” truck only has one axle under the trailer and a total load of 40,000 pounds.
What is HS25 loading?
H25/HS25 = 20,000-lb wheel load, 40,000-lb axle. Covers designed to meet the basic requirements for these loads need only be tested with a proof load to meet these minimums. If a specification requires H20/HS20 loading it simply requires a cover meet the design load of 16,000 pounds per wheel without a safety factor.
What is H20 traffic rating?
The Silva Cell can support vehicle loading up to AASHTO H-20 rating of 32,000 lbs. (14,500 kgs) per axle. This rating refers to the ability of a roadway to safely accommodate 3-4 axle vehicles, such as a large semi-truck and trailer.
What is HS20 44 loading?
What does the number “44” represent in HS-20-44? Quite often, this number “44” is mistakenly assumed to mean 44,000 lbs in some design context. The number “44” actually refers to the year, 1944, in which the HS-20 traffic loading conditions were originally developed by AASHTO.
What is AASHTO m306?
The M-306 Standard The American Association of State Highway and Transportation Officials (AASHTO) developed a standard, M-306, that calls for proof load testing of iron castings. For an H-20 proof load test, that standard requires a 40,000 lb. load to be applied to a 9” x 9” square plate for one minute.
What do you mean by HS20 truck loading?
What does HS-20 traffic rating mean? This is the term used by AASHTO and ACI to describe normal MOVING traffic loading conditions up to 18-wheeler loading. This loading assumes a 16,000 lbs wheel load and therefore a 32,000 lbs axle load.
What does HS20 mean?
HS-20 is the truck live loadings of the AASHTO specification, where H stands for highway, S stands for semi-trailer, 20 stands for 20-ton weight of the tractor (first two axles).
What is h-20/hs-20 loading?
What is H-20/HS-20 Loading? AASHTO’s H-20 and HS-20 are live load ratings applied to the design of bridges or other suspended items (e.g. lids for concrete vaults). Designers use H-20 or HS-20 from AASHTO, or specific axle configurations, to express the extreme load effect created by heavy vehicles such as transports, buses and fire trucks.
What is hs20-44 truck load?
The 1944 edition included the HS20 truck load and started a policy of affixing the year to loadings making HS20-44 the official designation. The additional ‘S’ made an allowance for heavier tractor-trailers that were available at the time. Figure 2 describes the load and load spacing for HS20-44.
What’s the difference between H-20 and HS-20 trucks?
What’s the Difference Between H-20 and HS-20? The difference between an H-20 and HS-20 is an H series truck has two loaded axles, one for the drive axle and one for the trailer, and an HS series truck has more than two loaded axles, one for the drive axle and more than one for the trailer.
What is the difference between HS20 and hl93 wheel load?
The HL93 “design truck” wheel load is the same as the HS20 wheel load. The HL93 “design tandem” wheel load is 12,500 pounds compared with the “Alternate Military Load” of 12,000 pounds. The extra 500-pound wheel load is not a large increase and will only affect those designs that did not have excess capacity.