09-07-2010, 11:07 PM
hi,
just want to share the key-steps needed for pusover analysis using sap2000.
1. in dead load case, from linear change to nonlinear of analysis type. the rest parameters no need to change.
2. in pushover case, select Continue from State at End of Nonlinear Case (DEAD) in Initial Conditions > Select Nonlinear in Analysis Type > Add LATERAL LOAD in Load Name of Loads Applied > Modify/Show in Load Application of Other Parameters > Select Displacement Control in Load Application Control > Select Use Monitored Displacement in Control Displacement > Fill in displacement magnitude (e.g. 10% total height of structure is fairly enough). Use the corner joint at roof top or top story for Monitored Displacement.
Normally, displacement magnitude will be set automatically by sap2000 and the value is commonly sufficient.
3. In pushover case, Modify/Show in Result Saved of Other Parameters > Select Multiple States in Result Saved > OK > Modify/Show in Nonlinear Parameters of Other Parameters > Select Apply Local Redistribution in Hinge Unloading Method > OK.
Tips: If your intention is seismic evaluation, pls use small quantity of lateral force (e.g. max 1kN at the top floor). Dont worry if you find the following warning because program just want to inform you that the lateral stiffness is already close to zero and analysis must be terminated.
Hope it will solve your non-convergence problem. :hunter:
Regards,
adekajeng
just want to share the key-steps needed for pusover analysis using sap2000.
1. in dead load case, from linear change to nonlinear of analysis type. the rest parameters no need to change.
2. in pushover case, select Continue from State at End of Nonlinear Case (DEAD) in Initial Conditions > Select Nonlinear in Analysis Type > Add LATERAL LOAD in Load Name of Loads Applied > Modify/Show in Load Application of Other Parameters > Select Displacement Control in Load Application Control > Select Use Monitored Displacement in Control Displacement > Fill in displacement magnitude (e.g. 10% total height of structure is fairly enough). Use the corner joint at roof top or top story for Monitored Displacement.
Normally, displacement magnitude will be set automatically by sap2000 and the value is commonly sufficient.
3. In pushover case, Modify/Show in Result Saved of Other Parameters > Select Multiple States in Result Saved > OK > Modify/Show in Nonlinear Parameters of Other Parameters > Select Apply Local Redistribution in Hinge Unloading Method > OK.
Tips: If your intention is seismic evaluation, pls use small quantity of lateral force (e.g. max 1kN at the top floor). Dont worry if you find the following warning because program just want to inform you that the lateral stiffness is already close to zero and analysis must be terminated.
Hope it will solve your non-convergence problem. :hunter:
Regards,
adekajeng