how to add nodal load

[tangzhen]

there is a file named "Pext.txt" which contains the nodal load I want to apply, and the load varies according to the time.
my problem is how to add this load to a node which we can name it "node 2",and we suppose there is only one DOF at the node.
please write the commands if possible. thanks a lot.

[fmk]

use Pext.txt as the timeSeries for the load pattern. place a nodal load with a unit value inside the load pattern at the node you want. the load pattern will get the load factor from the TimeSeries, this load factor is then given to the node which adds a multiple of the load pattern times the reference load to the node. if Pext.txt contains both time and value, you will need to split into 2 files one for load factor value and one for time at which that load factor occurs.