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 loading?
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 HL-93 truck?
HL-93 is a type of theoretical vehicular loading proposed by AASHTO in 1993. It is used as the design loading for highway structures in USA and other countries where AASHTO code is followed. AASHTO HL-93 vehicular live load is a combination of three different loads, HL-93 Design Truck (formerly, HS20-44 Truck)
What do you mean by H20 and HS20?
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 an 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 are Aashto standards?
AASHTO serves as a liaison between state departments of transportation and the Federal government. AASHTO is an international leader in setting technical standards for all phases of highway system development.
What is load rating for bridges?
The Load Rating is a measure of bridge live load capacity and has two commonly used categories: Inventory Rating, as defined by the current AASHTO Manual for Bridge Evaluation,3 is that load, including loads in multiple lanes that can safely utilize the bridge for an indefinite period of time.
What is Aashto loading?
The AASHTO service I loading combination is used for checking the deflection of the bridge design, i.e. [13.2] For maximum deflection, the truck or tandem is placed such that the center of gravity of the truck or tandem is on the center of the bridge, i.e. AASHTO arrangement I.
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).
What is H10 load rating?
Light raffic rated covers will support up to 16,000 lbs/axle load, which is an AASHTO H10 rating. Concrete covers utilize threaded inserts for machine assisted lifting.
When was the AASHTO HL-93 design truck proposed?
HL-93 is a type of theoretical vehicular loading proposed by AASHTO in 1993. It is used as the design loading for highway structures in USA and other countries where AASHTO code is followed. AASHTO HL-93 vehicular live load is a combination of three different loads, HL-93 Design Truck (formerly, HS20-44 Truck)
Is the hl93 the same as the HS-20?
The HL93 design loading consists of a combination of “Design Truck Plus Design Lane Load” or “Design Tandem Plus Design Lane Load” which ever produces the worst case. A “Design Truck “is same as the HS-20 load.
Is the HL-93 a combination of three different loads?
AASHTO HL-93 vehicular live load is a combination of three different loads, HL-93 Design Truck (formerly, HS20-44 Truck) HL-93 Design Tandem (formerly, … Read more
What does HS-20 stand for in AASHTO?
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).