21
Feb
Aashto Hs 20 Design Vehicle. These safety factors include dynamic load allowance impact factor multiple presence factor oversized load and load. It specifies truck axle loading of 32000 pounds or. The truck loads first used had the designation of H20 see Figure 1 which covered a two-axle truck weighing 20 tons. Culverts shall be design only to axle loads of a truck or Tandem no lane loads 1.
The Single Lane Loaded columns are for the single lane loaded case. The tandem x 12 factored force effect is equivalent to the old standard Spec. This is one of the factors included in the standard in addition to dead load soil weight surcharge loads and all applicable loadsafety factors. The front axle carried 8000 pounds and the rear axle 14 feet away carried 32000 pounds. 14500 kgs per axle. The Multiple Lanes Loaded columns are for as many lanes loaded as the AASHTO Code allows.
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.
14500 kgs per axle. It specifies truck axle loading of 32000 pounds or. The gross vehicle weight and minimum number of axles for Section I. The uniform load per linear foot of lane is equal to 0016 times the GWV for H trucks or 0016 times the weight of the tractor truck for HS trucks. Current AASHTO Live Load In the 1980s and early 1990s it became clear that the HS20 vehicle used in design was not a good representation of current highway loading and that a new design model was needed. The magnitude of the concentrated loads for shear and.