Incorporating Seismic Design into a Large Diameter Steel Water main in Proximity to the Fraser River

Description:Incorporating seismic design into a large diameter steel water main in proximity to the Fraser River. Presenter: Joel Melanson, P.Eng, Metro Vancouver. Additional Contributors: Anthony Fuller (Golder Associates). In order to meet growing water consumption demands of the communities south of the Fraser River, Metro Vancouver is in the process of installing a new 1.5 metre diameter water main called Port Mann Main No.2 in Coquitlam, BC. Due to the steep slopes and low-lying peaty soil conditions along the proposed alignment and its proximity to the Fraser River, Metro Vancouver undertook a significant seismic analysis to estimate the vertical and lateral displacements that the new water main would be exposed to under the 1:2475 year seismic event. The seismic analysis was carried out using 1-D and 2-D ground response analyses and finite difference (FLAC2D) modeling of lateral displacements. Results indicate liquefaction in the upper 10-15 metres with significant vertical and lateral displacements. These soil movements were then used in conjunction with a finite element model of the pipeline to account for soil-structure interactions. The pipeline design was optimized to account for these forces. Results also indicated a differential movement of up to 4 metres between the water main and its connecting point to the seismically designed Port Mann Water Supply Tunnel. Innovative techniques using large diameter rotating ball joints and flexible expansions joints were incorporated into the design to account for this significant differential movement.

Authors: Joel Melanson

Subjects:

Tags:2015 BCWWA Annual Conference & Trade Show,AC15,AC15 presentations

Citation:stream 6: Building Resilience

Publication Date:May 29th, 2015 Upload Date:Jun 26th, 2015

Resource Library



User Login
Enter your e-mail below and click the "Submit" button. If you are in our database, your login and password will be sent to you immediately.
InstructorNet Login
Enter your e-mail below and click the "Submit" button. If you are in our database, your login and password will be sent to you immediately.
DirectorNet Login