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Seismic Response of the Hwy 46/Cholame Creek Bridge During the 2004 Parkfield Earthquake

by B. Tom Boardman, Anthony V. Sanchez, Geoff Martin, Zia Zafir, Edward Rinne and Joe Tognoli

Boardman, Tom. B., Anthony V. Sanchez, Geoff Martin, Zia Zafir, Edward Rinne and Joe Tognoli (2006). Seismic Response of the Hwy 46/Cholame Creek Bridge During the 2004 Parkfield Earthquake. SMIP06 Seminar on Utilization of Strong-Motion Data, p. 101 - 116.

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Abstract

A Caltrans designed concrete slab bridge is located southwest of the 2004 Mw 6.0 Parkfield rupture zone. Peak horizontal accelerations of 1.0 g and absolute displacements of 4 inches were measured with six CSMIP accelerometers on the bridge, and one free-field accelerometer east of the bridge. Ground motions resulted in longitudinal soil displacements in front of the abutments and around the bent piles due to the structure swaying back and forth. Based on our displacement analyses using the measured ground motions, we found that the current Caltrans seismic design approach results in a close match with the measured bridge displacements.