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[GEN/Pushover]Does Modifying 'Max Displacement' in Pushover Load Case Affect the Pushover Curve in the Same Model?

Question

I am conducting a Pushover analysis using GEN. The example building is a 15-story apartment with a flat slab structure, and I have applied effective beam.

I defined Hinge Property as Column with PMy-Mz Type, and Wall and Beam with Moment-y-z Type. However, I encountered problems in the Pushover analysis results in the Graph afterward. Moreover, when I changed the Maximum Displacement, the Pushover Graph also changed. I expected the performance to remain the same since it's the same building. What could be the reason for this? What is the reason for this?

 

Answer

Upon reviewing your model, two issues were identified. Here are the details

1. Pushover analysis should be applied after structural design of members.
The performance of the section is dependent on the reinforcement, and especially for reinforced concrete members, the reinforcement information is essential when defining the yield strength characteristics.
Therefore, perform the member design first and check the reinforcement before performing the pushover analysis.

2. You have selected static seismic loads in the Load Pattern, which includes both horizontal concentrated loads at the mass centers of each floor and moment loads due to accidental eccentricity. When conducting a Pushover analysis, the inclusion of moment loads, i.e., rotational components of loads, can complicate the force-displacement relationship curve. For Pushover analysis, it's recommended to select Load Patterns representing the 1st mode load distribution, which dominates dynamic behavior.


By addressing these two points and re-running the analysis, you should obtain normal force-displacement curves.

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