What is AASHTO HS20?
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). The “Design Tandem “consists of two axles, each axle weighing 25 kips spaced 4 ft apart.
What is HS20 rating?
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 AASHTO Lane load?
The selected and current AASHTO live load vehicle is designated HL-93, and loading consists of a combination of the design truck or design tandem with the design lane load, specified to produce the extreme force effect. Transversely, the design lane load is assumed to be uniformly distributed over a 10.0-foot width.
What does a HS20 44 truck indicates?
The “HS” designation is followed by a number indicating the gross weight in tons of the tractor only. Example of an HS truck loading: HS20-44 indicates a vehicle with a front tractor axle weighing 4 tons, a rear tractor axle weighing 16 tons, and a semi- trailer axle weighing 16 tons.
What are Ashto standards?
The American Association of State Highway and Transportation Officials (AASHTO) is a standards setting body which publishes specifications, test protocols, and guidelines that are used in highway design and construction throughout the United States.
What does HS20 44 mean?
Example of an HS truck loading: HS20-44 indicates a vehicle with a front tractor axle weighing 4 tons, a rear tractor axle weighing 16 tons, and a semi- trailer axle weighing 16 tons.
What is a H25 load capacity?
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 does a HS20-44 truck indicates?
What is an H25 load capacity?
What is the lane load?
Lane loading is referred to as the load, which is used to provide the easier method of computing the shear and moments rather than using the concentrated wheel loads. These loads are used in the design of bridge decks, which consists of several lanes on the multiple spans.
What does H25 pound mean?
What are AASHTO’s H-20 and HS-20?
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 does HS-20 mean?
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. It also takes into consideration the additional loading that occurs from moving vehicles.
What is the AASHTO axle load?
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. It also takes into consideration the additional loading that occurs from moving vehicles.
What is the axle load of H-20 or HS-20?
AASHTO Loading of either H-20 or HS-20 is based on an axle load of 32 kips. This load is divided into two tires; that is a load at each end of the axle.