Mode Superposition Analysis of a Building — Lesson 2

This lesson covers the application of Ansys software in solving structural vibration problems. The lesson focuses on the use of model superposition analysis to determine the response of a structure to external forces such as earthquakes and wind loads. The lesson uses an example of an asymmetric plan building to illustrate the process. The building is modeled for analysis, and the earthquake ground motion is applied at the foundation level. The lesson also discusses the importance of defining the damping level, setting the time steps, and selecting the appropriate nodes for accurate results. The lesson concludes with the extraction and interpretation of the time history response.

Video Highlights

Explanation of the asymmetric plan building model used for analysis - 0:46
Discussion on the geometry and material used in the model - 1:33
Introduction to the topic of time history analysis - 2:10
Application of earthquake ground motion to the model - 2:54
Explanation of the steps to solve the response of the structure - 3:34
Discussion on the model mass and participation factor - 5:46
Explanation of the transient analysis and application of ground motion - 7:58
Demonstration of how to apply earthquake ground motion to the model - 9:14
Explanation of the damping level in the model - 17:56
Demonstration of how to solve the structure using model superposition - 23:09
Explanation of how to check the time history response - 23:54
Discussion on the use of model superposition in finding the response - 27:28

Key Takeaways:

- Ansys software can be used to solve structural vibration problems using model superposition analysis.
- The model superposition analysis involves defining the damping level, setting the time steps, and selecting the appropriate nodes.
- External forces such as earthquakes and wind loads can be applied at the foundation level of the structure.
- The response of the structure can be determined by extracting and interpreting the time history response.
- The lesson uses an example of an asymmetric plan building to illustrate the process, making it easier to understand and apply in real-world scenarios.