Didier, Max1; Abbiati, Giuseppe1; Broccardo, Marco1; Beyer, Katrin2; Danciu, Laurentiu3; Petrović, Miloš1; Mojsilović, Nebojša1 and Stojadinović, Božidar1
1 Institute of Structural Engineering (IBK), Swiss Federal Institute of Technology (ETH) Zurich, didierm@ethz.ch
2 Earthquake Engineering and Structural Dynamics Laboratory (EESD), Swiss Federal Institute of Technology (EPF) Lausanne
3 Swiss Seismological Service (SED), Swiss Federal Institute of Technology (ETH) Zurich
ABSTRACT
In Basel and St. Gallen, Switzerland, two pilot enhanced geothermal systems projects caused two sequences of induced earthquakes with magnitude up to 3.5. In Basel, hairline cracks in walls and non-structural damage arose from the largest of the events. This led to damage claims of approximately 7-10 million of Swiss Francs. It follows that prediction and quantification of nonstructural damage due to induced ground motions is central for estimating related financial risk. This perspective motivated the authors to develop a procedure for quantifying plaster cracks on URM walls caused by induced ground motions. Test protocols consisting of horizontal displacement sequences were produced for a reference masonry building considering a pool of ground motions consistent with the induced seismic hazard and using the rainflow counting algorithm. A quasi-static cyclic test campaign was conducted on five URM walls. An automatic procedure based on digital imaging correlation and image processing was developed to quantify plaster damage. The entire testing campaign as well as preliminary analyses are presented in this paper.
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