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Chile Observatories Earthquake Preparedness Workshop Atacama Large Millimeter/submillimeter Array

Chile Observatories Earthquake Preparedness Workshop Atacama Large Millimeter/submillimeter Array ALMA Eduardo Donoso. Table of Contents. Present status of ALMA Construction Seismic Requirements Buildings Antenna foundations Computers – Instruments racks November 14, 2007 Earthquake.

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Chile Observatories Earthquake Preparedness Workshop Atacama Large Millimeter/submillimeter Array

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  1. Chile Observatories Earthquake Preparedness Workshop Atacama Large Millimeter/submillimeter Array ALMA Eduardo Donoso Chile Observatories Earthquake Preparedness Workshop

  2. Table of Contents • Present status of ALMA Construction • Seismic Requirements • Buildings • Antenna foundations • Computers – Instruments racks • November 14, 2007 Earthquake Chile Observatories Earthquake Preparedness Workshop

  3. ALMA Site status Chile Observatories Earthquake Preparedness Workshop

  4. Chile Observatories Earthquake Preparedness Workshop

  5. San Pedro de Atacama, Atacama Desert, Northern Chile AOS OSF Site Chile Observatories Earthquake Preparedness Workshop

  6. ALMA Sites AOS (43km) OSF Site (15km) Chile Observatories Earthquake Preparedness Workshop

  7. Operations Support Facility Chile Observatories Earthquake Preparedness Workshop

  8. ALMA Offices ALMA Camp Chile Observatories Earthquake Preparedness Workshop

  9. OSF Technical Facilities Chile Observatories Earthquake Preparedness Workshop

  10. AEM Contractor Area AEM Contractor Area Chile Observatories Earthquake Preparedness Workshop

  11. MELCO Contractor Area MELCO Contractor Area Chile Observatories Earthquake Preparedness Workshop

  12. MELCO : August 2007 Chile Observatories Earthquake Preparedness Workshop

  13. Vertex Contractor Area Chile Observatories Earthquake Preparedness Workshop

  14. Vertex #1: August 2007 Chile Observatories Earthquake Preparedness Workshop

  15. Contractors Camp Chile Observatories Earthquake Preparedness Workshop

  16. Road: OSF-AOS: Transporter Chile Observatories Earthquake Preparedness Workshop

  17. ALMA Transporter Chile Observatories Earthquake Preparedness Workshop

  18. Transporter – May 2007 Chile Observatories Earthquake Preparedness Workshop

  19. Chile Observatories Earthquake Preparedness Workshop

  20. Chajnantor Plateau – looking north V. Licancabur Cº Chajnantor Pampa La Bola AOS Technical Building Center of Array Chile Observatories Earthquake Preparedness Workshop

  21. AOS Technical Building AOS Technical Building Chile Observatories Earthquake Preparedness Workshop

  22. Chile Observatories Earthquake Preparedness Workshop

  23. ACA Chile Observatories Earthquake Preparedness Workshop

  24. ALMA + ACA Atacama Large Millimeter/submillimeter Array Chile Observatories Earthquake Preparedness Workshop

  25. Santiago Central Office Chile Observatories Earthquake Preparedness Workshop

  26. ALMA Seismic Requirements Chile Observatories Earthquake Preparedness Workshop

  27. Seismic requirements Temporary Buildings • Chilean Code Permanent Buildings • ALMA special requirements – more stringent: 0.28 g • Chilean Code requirements – 0.20 g • No structural damage design Chile Observatories Earthquake Preparedness Workshop

  28. No structural damage design • Extremely conservative design: 0.446 g vs 0.28 g • Code written to minimize structural damage and prevent collapse: • Structure yields • Personnel evacuation • Costly repairs – 5.000 m = $$$ • ALMA designs to minimize damage (loads 5 times higher than required by code): • Seismic response factor 1 – no damping; accel. assumed directly to structure • No yield • No evacuation • No damage • Construction cost higher, but no operation stop Chile Observatories Earthquake Preparedness Workshop

  29. Permanent Buildings Special Features Rock anchors Chile Observatories Earthquake Preparedness Workshop

  30. Insulation for permafrost Chile Observatories Earthquake Preparedness Workshop

  31. Robust structure Chile Observatories Earthquake Preparedness Workshop

  32. Seismic requirements Antenna foundations • Case 1: Embedded into rock • Case 2: Rock anchors – foundation laying on rock • Case 3: Massive concrete standalone • In all cases stiffness governs design – operational requirement of high weight and fast switching Chile Observatories Earthquake Preparedness Workshop

  33. Foundation embedded in rock Chile Observatories Earthquake Preparedness Workshop

  34. Rock anchor design Chile Observatories Earthquake Preparedness Workshop

  35. Massive concrete design Chile Observatories Earthquake Preparedness Workshop

  36. Seismic requirements Computers – Instruments • Seismic design anchoring to foundations Chile Observatories Earthquake Preparedness Workshop

  37. Racks seismic design Chile Observatories Earthquake Preparedness Workshop

  38. Effects November 14, 2007 Earthquake Chile Observatories Earthquake Preparedness Workshop

  39. Nothing happened • No photos – no damage - ☺ Chile Observatories Earthquake Preparedness Workshop

  40. www.alma.info The Atacama Large Millimeter/submillimeter Array (ALMA), an international astronomy facility, is a partnership among Europe, Japan and North America, in cooperation with the Republic of Chile. ALMA is funded in Europe by the European Organization for Astronomical Research in the Southern Hemisphere, in Japan by the National Institutes of Natural Sciences (NINS) in cooperation with the Academia Sinica in Taiwan and in North America by the U.S. National Science Foundation (NSF) in cooperation with the National Research Council of Canada (NRC). ALMA construction and operations are led on behalf of Europe by ESO, on behalf of Japan by the National Astronomical Observatory of Japan (NAOJ) and on behalf of North America by the National Radio Astronomy Observatory (NRAO), which is managed by Associated Universities, Inc. (AUI). Chile Observatories Earthquake Preparedness Workshop

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