Funding: NSF RAPID: Post-Earthquake Monitoring of Buildings in Chile Using nees@UCLA Resources; PI J Wallace, Co-PI R. Nigbor; CMMI-1040574; Joy Pauschke, Program Director

In March 2010, nees@UCLA dispatched a team to Santiago, Chile for post-earthquake data reconnaissance, taking with them instrumentation for structural monitoring. The magnitde 8.8 February 27, 2010 Chile earthquake and it's aftershock sequence presented a unique opportunity to study the response of the modern built environment to large ground motions.

John Wallace (nees@UCLA PI(), Anne Lemnitzer (nees@UCLA collaborator) and Alberto Salamanca (nees@UCLA staff member), worked with the two major Chilean universities to deploy monitoring systems on several buildings. They gathered important data on the response of damaged and undamaged structures to strong shaking during aftershocks.

The design requirements for reinforced concrete buildings in Chile, which are the predominant form of construction, are almost indentical to the American Concrete Institute (ACI) Building Code; ACI 318-95; there are very minor exceptions. Therefore, the performance of these reinforced concrete buildings is of significant importance to the United States, as the performance of these builings is effectively a test of our code provisions. As well, studies following the 1985 earthquake in Chile resulted in significant changes to the ACI 318 building code. nees@UCLA acted rapidly to collect data from damaged and undamamged buildings to provide the data needed to support comprehensive future studies

During the two-week deployment, nees@UCLA trained Chilean university staff and students to monitor the installed equipment, which was left in situ to gather data until May 2010.

One of the instrumented buildings in Chile

A. Lemnitzer and A. Salamanca with instrumentation