TR.39 Load List Specification
This command allows specification of a set of active load cases. All load cases made active by this command remain active until a new load list is specified.
This command is used to activate the load cases listed in this command and, in a sense, deactivate all other load cases not listed in this command. In other words, the loads listed are used for printing output and in design for performing the specified calculations. When the PERFORM ANALYSIS command is used, the program internally uses all load cases, regardless of LOAD LIST command, except after a CHANGE command. In these two cases, the LOAD LIST command allows the program to perform analysis only on those loads in the list. If the LOAD LIST command is never used, the program will assume all load cases to be active.
Example
LOAD LIST ALL PRINT MEMBER FORCES LOAD LIST 1 3 PRINT SUPPORT REACTIONS CHECK CODE ALL
In this example, member forces will be printed for all load cases, whereas loading 1 and 3 will be used for printing support reactions and code-checking of all members.
Notes
- The LOAD LIST command may be used for multiple analyses situations when an analysis needs to be performed with a selected set of load cases only. All load cases are automatically active before a first CHANGE command is used.
- After a CHANGE command has been used anywhere in the data, it is good practice to specify the LOAD LIST command after an ANALYSIS command and before the next command; otherwise only the last case analyzed may be used in the design.
- Do not enter this command within the loads data (from the first Load command in an analysis set to the associated Analysis command).
- Additionally, load cases can also be short-listed using load envelopes. This may be needed when operations such as steel design need to distinguish between service load combinations and factored load combination cases.