This presentation provides an idea about the dynamic analysis of the building structure. This will provide you the necessary idea to perform dynamic analysis to access the seismic effects on the building.
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PPT - Dynamic analysis of building structure.pptx
1. Seismic analysis of the building structure
•Static analysis – Lumped mass analysis
• Approximate fundamental natural period of vibration
•In staad,
-reference load type definition
- seismic definition
-calling of seismic force
•Dynamic analysis – Time history analysis/ Response spectrum analysis
•In staad,
- seismic definition
- weight definition
-calling of weight for mass matrix calculation
-response spectrum definition
10. • Expected intensity of shaking in different zones.
• Reasonable estimation of the Peak Groung Acceleration(PGA ) in respective zone.
• Maximum Considered Earthquake (MCE) is an upper bound of the expected
earthquake in a given area- 10% probability of exceedence in 100years.
• Design Basis Earthquake(DBE) - 10% probability of exceedence in 50years.
• Indian code assumed ½ of the MCE .
Zone factor
11. • Functional use of the structures after earthquake, historical value/ economic
importance.
• Increase the design force level for critical and important structures.
Response Reduction factor
• Seismic damage performance of the structure under shaking.
• Brittle/Ductile deformation of the structure
Importance factor
13. Average response acceleration coefficient
Depends on,
• Damping of the structure
• Fundamental natural time period
• Soil at site
14. • Vertical distribution of base shear to different floor levels.
• Distribution of Horizontal Design Lateral Force to Different Lateral Force Resisting
Elements
• Floor Diaphragm Action
Distribution of design lateral seismic force
Rigid diaphragm