Moving Loads
In the 1.3 Moving Loads window, we define the load parameters. We define two sets of moving loads for both lanes.
Lane 1
The description Tandem axle 300 kN makes the assignment easier later.
We use the [Library] for load input (see the following image).
We select the load model LM1 - TS - 1. In the Load Parameters section, the load magnitudes (twice 150 kN), the contact patches (0.40 m x 0.40 m), and the gauge (2 m) are shown. The distance between the load positions x is 1.2 m. The first axle load is applied with a forward shift of 60 cm from the load fixed point in the direction of the moving line; the second axle load is set with a shift of 60 cm backwards. Thus, at the starting point of the moving line, the first axle is already on the deck whereas the second axle has not yet entered the runway.
Click [OK] to transfer the load model to the 1.3 Moving Loads window.
We define the uniform loading of 9 kN/m² in front of and behind the tandem axles by the load distributions Left - Endless and Right - Endless entered in table rows 3 and 4. The width of the lane is 4 m.
In order to consider the distance of 1.5 m in front of and behind the tandem axles, we define the location x on the left with -2.1 m (-0.60 m - 1.50 m) and on the right with 2.1 m (0.60 m + 1.50 m).
Lane 2
We create a second set of moving loads with the [New] button. We enter Tandem axle 200 kN as a description.
Again, we use the [Library] for entering the tandem axle load. We select the load model LM1 - TS - 2 with 100 kN wheel load each.
Click [OK] to transfer the load model to the 1.3 Moving Loads window.
We define the uniform loading of 2.5 kN/m² in front of and behind the tandem axles by the load distributions Left - Endless and Right - Endless.
The width of the lane is again 4 m. And again, the distance of 1.5 m in front of and behind the tandem axles is considered by the locations x of -2.1 m and 2.1 m.