27-12-2012, 06:44 PM
Earthquake Engineering
Earthquake Engineering.ppt (Size: 1.57 MB / Downloads: 211)
Basic Intent of Seismic Code
The structures are able to respond without structural damage to shocks of moderate intensities and without total collapse to shocks of high intensities
Codes are made for normal structures
Site-specific study for special structures
It is not the intent of code to provide regulations that the structure shall suffer no damage during earthquake of all magnitudes
Types of Structures
Non-Engineered buildings
High-Rise Buildings
Industrial Structures
Civil Infrastructures
Structural Safety Issues
Design of New Structures
Retrofit of Existing Structures
Basic Principles of Modern Codes(Seismic Design Philosophy)
Serviceability limit state: Structures must resist low-intensity earthquake without structural damage. Elastic behaviour is required during small and frequent earthquakes
Ultimate limit state: Structures should withstand an earthquake of moderate intensity (design earthquake having PGA with 90% probability of not being exceeded in 50 years) with repairable damage in structural as well as nonstructural elementsCollapse limit state: Structures should withstand high intensity earthquake with a return period much longer than design life without collapse