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Plz go thru this which explains about dynamic loading in Sttadpro
hope it will help u in carrying out dynamic analysis in Staad
There are 2 issues to consider in the use of STAAD for dynamic analysis - how STAAD
idealises the distribution of mass and how to apply the forcing function.
STAAD distributes the mass via the SELFWEIGHT command. When this is done, the
mass is lumped at the nodes. If this is an inadequate model of the mass idealisation, the
member concentrated load command CON can be used to tell STAAD that significant
masses are located there and their values. Also, the user can split the member into shorter
lengths by inserting nodes along the member. In this case, the user can use the JOINT
LOAD command to tell STAAD that a significant mass is located there and its mass.
The SELFWEIGHT command is placed as the first line (or lines) of the commands under
the relevant LOAD command. If the CON or JOINT LOAD commands are used, it is
placed after the SELFWEIGHT command.
To apply a forcing function in STAAD at the nodes, or at a particular location, you must
first define the type of forcing function using the DEFINE TIME HISTORY command.
Note that a forcing function can only be applied at a node so if the user wishes to apply
the function to a point along a member, a node must be placed there first.
You then use the TYPE āiā FORCE command along with its particular syntax
requirements. Finally, under the relevant LOAD command and after the mass
idealisation commands (i.e. SELFWEIGHT, CON, JOINT LOAD), you use the TIME
LOAD command. You can only use the TIME LOAD command in one load case.
Plz go thru this which explains about dynamic loading in Sttadpro
hope it will help u in carrying out dynamic analysis in Staad
There are 2 issues to consider in the use of STAAD for dynamic analysis - how STAAD
idealises the distribution of mass and how to apply the forcing function.
STAAD distributes the mass via the SELFWEIGHT command. When this is done, the
mass is lumped at the nodes. If this is an inadequate model of the mass idealisation, the
member concentrated load command CON can be used to tell STAAD that significant
masses are located there and their values. Also, the user can split the member into shorter
lengths by inserting nodes along the member. In this case, the user can use the JOINT
LOAD command to tell STAAD that a significant mass is located there and its mass.
The SELFWEIGHT command is placed as the first line (or lines) of the commands under
the relevant LOAD command. If the CON or JOINT LOAD commands are used, it is
placed after the SELFWEIGHT command.
To apply a forcing function in STAAD at the nodes, or at a particular location, you must
first define the type of forcing function using the DEFINE TIME HISTORY command.
Note that a forcing function can only be applied at a node so if the user wishes to apply
the function to a point along a member, a node must be placed there first.
You then use the TYPE āiā FORCE command along with its particular syntax
requirements. Finally, under the relevant LOAD command and after the mass
idealisation commands (i.e. SELFWEIGHT, CON, JOINT LOAD), you use the TIME
LOAD command. You can only use the TIME LOAD command in one load case.