Traffic Page SNiP
The values of load depend on the class of the load (K) which is defined from GOST 52748: for permanent structures K=14, for wooden bridges K=11, for structures under reconstruction K>=11 or it should be defined by the user. For railroad for capital structures K=14 and for wooden bridges K=10. But the schemes for load models with load class K=14 is different, because one of them is for road bridges and the other is for railway bridges.
AK-1 load model
AK is a set of bands each of which consists of vehicle with two axles and uniformly distributed load. The load on each axle is P=10K kN and the uniformly distributed load is v=1K kN/m. If there is more than one lane, the load should be multiplied on the coefficient s1, which equals to 1.0 for axle loads and 0.6 for uniformly distributed load.
AK-2 load model
In AK-2 pedestrian load is not consider anymore,traffic load is distributed on the whole deck width and 2 lanes are always working together as a group so even number of lanes is required for definition.They can be then together mirrored or moved in any other position.
Setting | Description |
---|---|
Load class (K) | class of the load which as default for this type of structure is 14. |
Axle load (P) | load on axle and calculated as 10K kN.It can be seen in the plot as the red point load and automatically updated when the load class K is changed. |
Uniform load (v) | uniformly distributed load and calculated as 1K kN/m.In the plot it is divided by the lane width. |
Lane factor | uniform load multiplication coefficient for more than one lane. |
Axle distance | distance between load train axles. |
HK load model
HK is the load from the heavy vehicles and tracked vehicles as 4-axle truck with the load 18K on each axle.