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Frequently Asked QuestionsWhat is the HL93 Highway loading and how is it different than...

What is the HL93 Highway loading and how is it different than HS-20?

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.

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 an HS truck?

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 H25 load capacity?

For loads of up to 25 tons / 50,000 lbs. AASHTO H25 or HS-25 Loading is specified for areas that will be subjected to frequent heavy vehicle traffic (such as trucks). The H25 design load is per AASHTO’s M-306-10 load test requirements – proof load testing to 50,000 lbs.

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What is the rear wheel load for hs 20?

One of the differences between these ratings, is HS-20 refers to traffic loading conditions with wheel loads up to 45,136 lbs, when considering impact and load factors, while Tier 22 is using a 33,750 lbs wheel load tested in a vertical position.

What is hl93 loading?

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.

What is Lane load in bridge design?

The load is applied to a single defined Lane Loading Width of a Design Lane within the roadway (or to a sidewalk), and may be defined either as covering the whole length of a span, or as start and end stations along the design line from which the roadway has been set out.

What is h15 loading?

Most bridges in the United States were designed to accommodate either an H-15 or HS-20 loading. An H-15 loading is represented by a two-axle single unit truck weighing 30,000 pounds (15 tons) with 6,000 pounds on its steering axle and 24,000 pounds on its drive axle.

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.

What is Cooper E80 loading?

Railroad Boussinesq Strip Load Live loads for Railroads are based on the Cooper E80 loading. Cooper E80 is designed to approximate 2 locomotives with 80 kips per axle pulling an infinite train of 8 kips per foot. The lateral pressure from the loading will be determined using the Boussinesq Strip Loading procedure.

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What is load rating for bridges?

Load rating is the measure of a bridge’s ability to carry a given live load. Knowledge of the capacity of each bridge is critical for its proper functioning.

What traffic rating means?

Traffic-Rated: This casting meets the AASHTO M306 proof load, and the loading criterion is 40,000 to 100,000 lbs. This designation is appropriate for traditional traffic loading. • Airport-Rated: This casting can accept loading from 200,000 lbs and up and includes an additional safety factor beyond FAA design loading.

Is tier 22 traffic rated?

Tier 22 is specified for Driveway, parking lot and off roadway applications subject to occasional non-deliberate heavy vehicular traffic. Design load 22,500 lbs. and a minimum failure load of 33,750 lbs.

What is corrugated HDPE pipe?

Corrugated HDPE Pipes Corrugated HDPE is primarily used for gravity flow water management systems such as storm drainage, subsurface drainage, sanitary sewers, and leachate collection. HDPE is considered suitable for use in underground structures, due to its light-weight and non-brittle properties.

What are AASHTO 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.


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