09-07-2010, 11:32 AM
Hi abouferass88,
If the intention is only for a common 2D pushover analysis with one direction of lateral loading (or 3D with regular in plan), a single diagonal compression member is sufficient. However, there will be no problem if you provide two diagonal compression members for this case, since the program will activate this member only when the compression force applied. It is meant when one of these members compressed, the other would be tensioned (= axial force equal to zero).
For pushover analysis of 3D structural system with irregularity in plan, providing two diagonal compression members is necessary because we need to analyzed the structure in two main directions. This is also the case if you want to run nonlinear time history analysis either for 2D or 3D structural system as well as for regular or irregular in plan / vertical.
P.S. Make sure you deactivate the selfweight of this compressional member to avoid additional axial force on this member.
Hope it helps.
Adekajeng
If the intention is only for a common 2D pushover analysis with one direction of lateral loading (or 3D with regular in plan), a single diagonal compression member is sufficient. However, there will be no problem if you provide two diagonal compression members for this case, since the program will activate this member only when the compression force applied. It is meant when one of these members compressed, the other would be tensioned (= axial force equal to zero).
For pushover analysis of 3D structural system with irregularity in plan, providing two diagonal compression members is necessary because we need to analyzed the structure in two main directions. This is also the case if you want to run nonlinear time history analysis either for 2D or 3D structural system as well as for regular or irregular in plan / vertical.
P.S. Make sure you deactivate the selfweight of this compressional member to avoid additional axial force on this member.
Hope it helps.
Adekajeng
.