Ambient Vibration Test and Seismic Performance Assessment of Portage Creek Bridge

Abstract eng:
Constructed in 1983, the Portage Creek Bridge is a three span highway bridge located in Victoria, British Columbia (BC), Canada. This bridge is a part of a smart seismic monitoring program, British Columbia Smart Infrastructure Monitoring System (BCSIMS), funded by the Ministry of Transportation and Infrastructure (MoTI) BC, Canada. The BCSIMS is a real-time seismic monitoring program that assesses the seismic conditions of the selected bridges on lifeline highways in BC. The bridge was undergone a seismic retrofit in 2003. Most of the bridge was retrofitted by conventional materials and methods. An innovative retrofit technique-Fiber Reinforce Polymer Wraps (FRPs) was applied to strengthen the short column for shear without increasing the moment capacity. As part of the BCSIMS, an Ambient Vibration Test (AVT) was carried out on the bridge in September 2014, and the FEM of the bridge was created using Sap2000 [1]. The FEM of the bridge was updated using the AVT results, and the updated FEM was used to perform nonlinear static and dynamic analysis to assess the seismic performance of the bridge in accordance with the Canadian Highway Bridge Design Code, 2015.

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