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Presentation on the 14th European Conference on Earthquake Enginnering

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  1. 1. 14 th European Conference on Earthquake Engineering SelEQ: a web-based application for the selection of earthquake ground motions for structural analysis João Dias, José Miguel Castro, Xavier Romão ; Marília Gonçalves; João Correia Lopes
  2. 2. What is SelEQ? SeleEQ is a web-based application for the search and selection of earthquake waveforms and records . SeleEQ incorporates filtering procedures allowing for the search of seismic records based on geophysical data but also on criteria such as spectral shape matching , following current seismic design code requirements.
  3. 3. Some technical details about SelEQ SelEQ is a web-based querying application implemented in a modular structure to allows for its improvement and evolution . The back-end of the application was created in PHP and JavaScript , and a MVC architecture pattern was adopted. The front-end of the application was built with XHTML and CSS . The system runs over a database designed in MySQL . The database's data model and the interaction with the database were designed to enable the possibility of adding new strong motion databanks. Currently only the NGA database is available. The most CPU demanding calculations make use of specially developed C-coded software.
  4. 4. SelEQ usage: search for waveforms Dropdown menus to define filters
  5. 5. SelEQ usage: search for waveforms
  6. 6. SelEQ usage: search for waveforms Links to popup windows
  7. 7. SelEQ usage: search for waveforms Links to Station Information
  8. 8. SelEQ usage: search for waveforms Select different data to plot
  9. 10. SelEQ usage: search for records Dropdown menus to define filters
  10. 11. SelEQ usage: search for records
  11. 12. SelEQ usage: search for records Links to information popup windows
  12. 13. SelEQ usage: search for records Target spectral shape Period range and acceptable mismatches
  13. 15. SelEQ usage: search for records
  14. 16. SelEQ usage: search for records
  15. 17. Live usage of SelEQ
  16. 18. Analysis of the results of SelEQ
  17. 19. Conclusions SelEQ is easy to use and allows for the flexible search for earthquake ground motions SeleEQ can be easily enhanced with the introduction of new filtering criteria. Contact us with suggestions: In the context of performance-based earthquake engineering methods which increasingly rely on nonlinear dynamic analyses, SeleEQ is a valuable tool SelEQ does not require the installation of additional software
  18. 20. Future developments of SelEQ New filtering criteria are currently being introduced (e.g. search for records based on the Mean Period) Different response spectra and different damping values will be available (e.g. ASCE 07, user-defined spectrum, compatibility with displacement spectrum) Searching for Sets of Records according to current seismic deign code provisions (already under development) A linear optimization algorithm is being developed based on the MINOS large-scale optimization solver Heuristic strategies will be used to reduce the number of combinations to test (sets of 7 records using a sample of 50 records ≈ 100 million combinations)