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Seismic Analysis of the Sylmar Interstate 5 and Highway 14 Connector Bridge

by Robert Dowell

Dowell, Roert (2004). Seismic Analysis of the Sylmar Interstate 5 and Highway 14 Connector Bridge. SMIP04 Seminar on Utilization of Strong-Motion Data, p. 41 - 60.

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Abstract

This paper presents measured and analysis time-history results of the heavily instrumented 10-span North Connector Bridge (53-2795F) at the 5/14 Interchange, subjected to the M7.1 Hector Mine earthquake. Relatively simple spine and more detailed shell element models were developed. Measured base motions were used as input for the finite element models, with absolute and relative superstructure displacement time-histories compared to measured responses. Results show that 5% equivalent viscous damping is realistic, as is the concrete strength of 5 ksi. It was found that the rotational mass inertia of the superstructure is an important quantity for spine models of single-column-bent bridges.