Question
While using the MLV tracer to check the loading for particular element, only three out of four point loads (4×100 kN) appear in the model. Why is one of the point loads missing?
Answer
In moving load analysis, the software performs influence line analysis at predefined wheel locations. Typically, two wheel positions are considered per axle. However, in some cases, one of these wheel locations may be excluded from the analysis results.
This exclusion can occur due to various modeling conditions, such as:
- Coarse or irregular mesh near the influence line
- Element geometry or slope at the point of load application
- Incompatibility between the defined load path and the structural mesh
As a result, one of the wheels may not be properly assigned, and the corresponding point load does not appear.
To address this issue, it is recommended to reduce the element size or refine the mesh, particularly around the centerline or the intended wheel path. This adjustment increases the likelihood that all wheel loads are accurately applied and reflected in the analysis.
An illustrative image is provided to clarify the behavior.
