RESPONSE OF BRIDGES DUE TO LIQUEFACTION INDUCED LATERAL SPREADING Erickson Nguon University of Auckland, New Zealand August 7, 2013.

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RESPONSE OF BRIDGES DUE TO LIQUEFACTION INDUCED LATERAL SPREADING Erickson Nguon University of Auckland, New Zealand August 7, 2013

Project Overview The objective of this project is to investigate and model bridge responses due to liquefaction induced lateral spreading. Specifically the Avondale Bridge in Christchurch will first be investigated and if time permits additional bridges in the Christchurch region will be investigated. A computer generated Ruaumoko model of the bridges will be created under a displacement loading similar to the soil displacements investigated on-site. With the model the results will be validated with the actual results of the bridge. After the model is validated sensitivity testing will be conducted and additional bridges will investigated.

Recent Progress Created a Excel macro to: ▫ Determine first yield and crack at the abutment-pile connection ▫ Determine first yield and first crack at depth of the pile ▫ Determine at which displacement step the rotation meets the actual back-rotation of the abutment ▫ Save profile data for each respective cases Comparative analysis of data

Figure 1: Snippet of excel macro that produces the time step when cracking and yielding occurs at the top of the pile

Goals Fully create model of both abutments and piles and bridge deck together Sensitivity testing of the entire model together Make sense of data and comparative analysis with all the results If time permits progress onto another bridge

Projected Progress Meet with Liam to review my recent progress of the model bridge. Adjust moment curvature of hinges to better reflect results because current results yields a very large moment. At ~4 meters depth you can see that the moment far exceeds the red line, which is where the yield moment is.

Auckland Driving in New Zealand We decided to take a weekend off from traveling, enjoy Auckland, and plan the rest of our trip to South Island and Australia. We went to Sky City, checked out the NZ film festival, went shopping, and tried new restaurants around town.

Acknowledgments Thank you to: PRIME: Peter Arzberger, Gabriele Wienhausen, Teri Simas UCSD Mentor: Lelli Van Den Einde UofA: Liam Wotherspoon, Dmytro Dizhur