Seismic Responses of Shot Span Bridge under Three Different Patterns of Earthquake Excitations
- Department of Civil Engineering, Hohai University, Nanjing 210098 (China)
- School of Water Conservancy and Environment, Zhengzhou University, Zhengzhou, 450001 (China)
This paper presents a study of the influence of three different types of seismic input methods on the longitudinal seismic response of a short, three-span, variable cross-section, reinforced concrete bridge. Research progress of the seismic model is introduced briefly. Finite element model is created for the bridge and time history analysis conducted. Three different types of illustrative excitations are considered: 1) the EI-Centro seismic wave is used as uniform excitations at all bridge supports; 2) fixed apparent wave velocity is used for response analysis of traveling wave excitations on the bridge; 3) conforming to a selected coherency model, the multiple seismic excitation time histories considering spatially variable effects are generated. The contrast study of the response analysis result under the three different seismic excitations is conducted and the influence of different seismic input methods is studied. The comparative analysis of the bridge model shows that the uniform ground motion input can not provide conservative seismic demands-in a number of cases it results in lower response than that predicted by multiple seismic excitations. The result of uniform excitation and traveling wave excitation shows very small difference. Consequently, multiple seismic excitations needs to be applied at the bridge supports for response analysis of short span bridge.
- OSTI ID:
- 21361981
- Journal Information:
- AIP Conference Proceedings, Journal Name: AIP Conference Proceedings Journal Issue: 1 Vol. 1233; ISSN APCPCS; ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BRIDGES
BUILDING MATERIALS
CALCULATION METHODS
COMPOSITE MATERIALS
CONCRETES
CROSS SECTIONS
EARTHQUAKES
ENERGY LEVELS
EXCITED STATES
FINITE ELEMENT METHOD
GROUND MOTION
MATERIALS
MATHEMATICAL SOLUTIONS
MECHANICAL STRUCTURES
MOTION
NUMERICAL SOLUTION
REINFORCED CONCRETE
REINFORCED MATERIALS
SEISMIC EVENTS
SEISMIC WAVES
SEISMOLOGY
TRAVELLING WAVES
VELOCITY
WAVE PROPAGATION