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Unknown Bearing
Full line loads
When you have selected unknown bearing he program initially creates loads that extend over the user-input span type only, as the precise dimensions of the other span lengths are not known. After design, the program adjusts the loads to extend over the full uniform span
Point Loads
If design span is entered, the program assumes the point loads are applied relative to the reaction points, so that if a point load that was at 4' is adjusted to be 4.2” from the beam end when 2” designed bearing length is added. This ensures that point loads over supports remain over supports. The values in the load input are adjusted accordingly
If clear span is input, the point load is shifted by the full input bearing width. A point load originally entered at the end of the clear span winds up within the design span and not over the support. As you cannot enter a load outside the span of the input span type, in order to input a clear span with a point load over support you must either adjust the load location after design or input a known bearing length.
If actual span is input, the point loads remain at the input points before and after design. Point loads entered at the end of the member remain there after design, and be applied to the bearing support and not over the design span.
Partial line loads
The behaviour of the start and end points of partial line loads is identical to the behaviour of point loads. The program does not adjust the magnitude of a partial line load when making adjustments to the start and end point locations.
Known Bearing
If the bearing length is known, then only the minimum bearing length is unknown before design. This changes the load entry as follows:
Design span
Since the minimum bearing length is not known, the situation is the same as for unknown bearing, the program does not know the minimum bearing, clear span, or actual length of the member, and adjusts the load location based once design is performed.
Clear span
In this case, the program is able to determine the actual span, and a line load is considered to span the entire member both before and after design, and one can place a point load on the support outside of the design span from the start
Actual span
In this case also the length of the beam is known and a line load extends the full length both before and after design, and that the location of point loads and partial loads is also invariant.
Change of span type after load entry
The program makes the necessary adjustments to the loads if the span type is changed after the load entry.
Uniform line loads
The program adjusts the loads so they extend the length of the input span type when the actual beam length is not known, and the full length of the beam when it is known.
Partial loads and Point Loads
These loads just maintain their start and end points, or the point load location, with respect to the start of the new span type. This can cause a point load that was over a support to move to be within the design span if it is not adjusted manually.