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Section 5
5-279
Example
MEMBER PRESTRESS
2 TO 7 11 FORCE 50.0
MEMBER POSTSTRESS
8 FORCE 30.0 ES 3.0 EM -6.0 EE 3.0
In the first example, a prestressing force of 50 force units is
applied through the centroid (i.e. no eccentricity) of members 2 to
7 and 11. In the second example, a poststressing force of 30 force
units is applied with an eccentricity of 3 length units at the start, -
6.0 at the middle, and 3.0 at the end of member 8.
One of the limitations in using this command is that under any one
load case, on any given member, a prestress or poststress load may
be applied only once. If the given member carries multiple stressed
cables or has a PRESTRESS and POSTSTRESS load condition,
such a situation will have to be specified through multiple load
cases for that member. See example below.
Incorrect input
LOAD 1
MEMBER PRESTRESS
6 7 FORCE 100 ES 2 EM -3 EE 2
6 FORCE 150 ES 3 EM -6 EE 3
PERFORM ANALYSIS