Assessment of the Samoa Channel Bridge-foundation seismic response

作者：Wang, Ning; Elgamal, Ahmed^*; Lu, Jinchi

来源：Soil Dynamics and Earthquake Engineering, 2018, 108: 150-159.

DOI：10.1016/j.soildyn.2018.01.042

• Highway bridge
• Earthquake response
• Soil-structure-interaction
• SSI
• Pile foundation

Recorded earthquake motions from the extensively instrumented Samoa Channel Bridge provide valuable information on the mechanisms of structural response during seismic excitation. Using this data, system identification techniques are employed to derive salient response characteristics of the bridge system and its foundations. For that purpose, Finite Element (FE) modeling is employed along with the optimization software framework SNOPT, to study the transverse-direction bridge response. Records from the strongest to date 2010 Ferndale earthquake (PGA of about 0.16 g), along with five other low-amplitude shaking events (2007-2014) are employed to evaluate the bridge-ground-foundation-system behavior. As such, the FE model for this system is calibrated using the recorded data. On this basis, estimates of the column and foundation lateral stiffness during the low amplitude and the strong shaking phases of seismic response are derived. Reductions in the column and foundation stiffness as a function of response amplitude are clearly observed. Overall, the reported investigation highlights the significance of seismic instrumentation as a valuable tool to provide insight into the behavior of actual structure-ground-foundation systems.

• 出版日期2018-5
• 单位中国地震局