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Seismic requirements for Bridge superstructure 1
- Thread starter KOKONIS36
- Start date
bridgesdesign
Structural
please refer to latest codal requirement of your area.
seimic force will assessed on the basis of the mass of the structue.
seimic force will assessed on the basis of the mass of the structue.
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1
- #3
bridgeman1
Structural
Kokonis36,
Two comments on your question:
1) Fundamentally, bridge design follows the weak column/strong beam concept (basically opposite of buildings.) Because of this, the superstructure (bridge deck) is a capacity protected element and must be able to behave elastically under plastic hinging of the column. The AASHTO I-A seismic code describes the design specifics for both steel and concrete superstructures.
2) Depending on your specific location, several codes in high seismic areas have included a vertical component to the seismic design forces (typically 2/3 the horizontal spectra, but this is very general.) Again, the superstructure needs to remain elastic under this event.
Your question was fairly broad, but I hope this helps, or starts further discussion.
Two comments on your question:
1) Fundamentally, bridge design follows the weak column/strong beam concept (basically opposite of buildings.) Because of this, the superstructure (bridge deck) is a capacity protected element and must be able to behave elastically under plastic hinging of the column. The AASHTO I-A seismic code describes the design specifics for both steel and concrete superstructures.
2) Depending on your specific location, several codes in high seismic areas have included a vertical component to the seismic design forces (typically 2/3 the horizontal spectra, but this is very general.) Again, the superstructure needs to remain elastic under this event.
Your question was fairly broad, but I hope this helps, or starts further discussion.
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