Which of the following is permissible value of deflection for foot bridge?
The deflection of cantilever arms due to service pedestrian live load should be limited to 1/300 of the cantilever arm. The horizontal deflection due to lateral wind load shall not exceed 1/500 of the length of the span.”
What is load rating on bridges?
16. Abstract Load rating is defined as the determination of the live load carrying capacity of a bridge using as-built bridge plans and supplemented by information gathered from the latest field inspection. Load ratings are expressed as a rating factor or as a tonnage for a particular vehicle.
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.
How much deflection in a bridge is acceptable?
The maximum 1/800 of the span length for general vehicular bridges and 1/1000 of the span length for vehicular bridges with pedestrian traffic are universally accepted criteria for the live load deflection limit.
What does H 20 loading mean?
32,000 pounds
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. wheel load or 75% of H20. H20 or “Traffic-Rated”- Heavy duty traffic rating.
What is H20 live load?
Live loads are temporary loads that act on a structure. As defined in the AASHTO Standard Specifications for Highway Bridges, the design live load is defined as H20/HS20 truck loading or lane loading using the load that produces the largest moment or shear.
What does HL 93 mean on a truck?
In Part 2, the nature of the truck it represents is defined. The HL-93 notional live-load model, in which HL stands for “highway load” and 93 designates the year of its development of the AASHTO LRFD Bridge Design Specifications is the superposition of a vehicle and a lane load.
What is HL-93 loading?
It has 3 basic Live Loads for bridges called HL-93 Loading (where H stands for highway and L stands for Loading, developed in 1993). Design Truck Design Tandem Design Lane
What is AASHTO HL-93 vehicular live load?
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) HL-93 Design Tandem (formerly, Alternate Military)
What is the weight of the hlhl-93 design tandem?
HL-93 Design Tandem consist of twin axles spaced 4’ (1.2m) apart, weight of each axle is 25kip (110 kN). The distance between the tyres in an axle is 6’ (1.8m).