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 loading in PSF?
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. Standards as published by AASHTO are categorized into classes.
What is the difference between HS-20 and HL 93?
A comparison of old versus new indicates that the difference is very small. 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.
What is H and HS loading?
The simple difference is an “H” series truck is a two-axle truck, while an “HS” series truck has multiple loaded axles (i.e. a semi-trailer vehicle). Quite simply, the number following the “H” is the gross tonnage of the design vehicle.
What is the difference between H 20 and HS-20 loading?
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.
How much is h20 loading?
H-20 Loading: American Association of State Highway Transportation Officials (AASHTO) published its bridge design criteria, commonly known as H-20 or HS-20. It consists of truck axle loading of 32,000 lbs, or wheel loading of 16,000 lbs.
What are the 3 types of loads?
The loads in buildings and structures can be classified as vertical loads, horizontal loads and longitudinal loads. The vertical loads consist of dead load, live load and impact load.
What is an H 20 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 is H 40 loading?
AASHTO H40 or HS-40 Loading is specified for areas that will be subjected to extremely heavy truck traffic (such as truck stops, fire stations and mining facilities). The H40 design load is per AASHTO’s M-306-10 load test requirements – proof load testing to 64,000 lbs.
What is the difference between h20 and HS20 loading?
Why do we use the hs-25 classification?
The simple answer is that we use the HS-25 classification to rate the strength of a system so that we know where it can be used and how much loading it will be able to handle.
What is the difference between a HS20 and HS25 truck?
An “H25” or an “HS25” series truck will be almost identical – except the drive axle will be 10,000 pounds and the axle (s) under the trailer will be 40,000 pounds each. Figure 1 below illustrates the axle load and spacing breakdown for both HS20 and HS25 design trucks. Keep in mind the “H” equivalent of these loads simply removes the back axle.
How many sides of a bridge should be fully loaded?
If bridges have cantilevered sidewalks on both sides, one or both sides should be fully loaded, whichever produces the maximum stress.
What is the design tandem of the HS20?
The HS20 vehicle is shown in Figure 1 above. The “design tandem” and the design lane load. The design tandem shall consist of a pair of 25-kip axles spaced 4 feet apart and the transverse spacing of the wheels shall be taken as 6 feet.