Earthquake Loads on Bridge Piers

Question

Earthquake Loads on Bridge Piers

tranquilito (Structural)

(OP)

27 Aug 03 10:27

Hello. I need to know where to find a complete example of how to compute load due to longitudinal and transverse motion on an earthquake acting on piers of a multi span bridge. I was checking the text "Bridge Engineering" by Demetrios Tonias, but the example is incomplete for Transverse motion.

Thanks a lot.

VoyageofDiscovery (Structural) · Answer 1 · 2003-08-27 13:42:22

Hi tranquilito,

Note that the Example 4.2 in that book applies to multi, simple spans and not for continuous multi-span. The example uses single-mode spectral analysis which may not apply in your case. Usually one needs to do a multi-mode spectral analysis. Bridge software can usually handle this.

Regards

VOD

tranquilito (Structural) · Answer 2 · 2003-08-28 10:00:25

Thanks for your comment. My multi-span bridge has simple supported beams. Maybe we can find a complete example using the single-mode spectral analysis.

Thanks a lot.

rowe (Structural) · Answer 3 · 2003-08-28 10:26:25

NHI Course No. 10063 provides a very good overview of seismic bridge design theory.

Publications FHWA-SA-97-006 thru 012 are comprehensive examples of seismic design illustrating structural models and seismic analysis (categories a,b,etc).

006 Two-span continuous cip conc. box bridge
007 Three-span continuous steel girder bridge
008 Single span AASHTO precast girder bridge
009 Three-span Continuous cip conc. bridge
010 Nine-span viaduct steel girder bridge
011 Three span continuous cip conc. box bridge
012 Twelve-span viaduct AASHTO precast conc. bridge

Although they may be a little out-dated with respect to the current aashto guide, they still offer alot of valid information at a very (very) reasonable cost.

good luck.

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Earthquake Loads on Bridge Piers