25 September 2012 E-ELT seismic devices analysis and prototype testing
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Abstract
During the E-ELT Dome and Foundations FEED Study, IDOM developed a Base Control System for protection of the E-ELT Main Structure against the effect of high level earthquakes. The proposed design was aimed to provide an effective isolation during heavy seismic events, whereas in normal observation conditions it presented a high stiffness to avoid interferences with the pointing accuracy of the telescope. In a subsequent phase, a representative prototype was envisaged by IDOM, in close collaboration with GERB, to evaluate the performance of this system, correlate the results from prototype testing with the behaviour predicted by a calculation model and finally validate the design conceived during the FEED Study. The assessment of the results from the prototype tests has been focused on checking the level of compliance with the demanded requirements: 1) the Base Control System isolates the upper structure from ground in case of high magnitude seismic events; 2) in operational conditions, the system -by means of Preloaded Devices (PLDs)- provides a stiff interface with the ground; 3) regarding the performance of the PLDs, the finite element model simulates accurately the non-linear behaviour, particularly the zero crossing when the direction of the excitation changes; 4) there is no degradation of the stiffness properties of the seismic devices, after being submitted to a heavy seismic event. The prototype was manufactured by GERB and pseudo-integrated tests were performed on a shaking table at the premises of the Institute of Earthquake Engineering (IZIIS) in Skopje, Macedonia.
© (2012) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Celia Gómez, Alexander Avilés, Armando Bilbao, Daniel Siepe, Peter Nawrotzki, "E-ELT seismic devices analysis and prototype testing", Proc. SPIE 8449, Modeling, Systems Engineering, and Project Management for Astronomy V, 844918 (25 September 2012); doi: 10.1117/12.925001; https://doi.org/10.1117/12.925001
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