Region and site specific design guidelines for the northeastern Venezuela development
- INTEVEP, S.A., Caracas (Venezuela). Research and Technological Center of Petroleos de Venezuela
- Geohidra Consultores, C.A., Caracas (Venezuela)
Several site specific studies were performed for the northeastern Venezuelan offshore development in order to determine the environmental parameters for the engineering design. The geotechnical parameters were obtained from the analysis of the soil borings, in situ tests and the high resolution seismic surveys. An evaluation of the seismic hazard was done, based on a detailed neotectonic study, the compilation of historical and instrumental seismological information, and an attenuation relationship developed for the studied area. Seismic response analyses were performed using the seismic parameters and dynamic characteristics obtained form the soil borings and in situ tests of shear waves. The met-ocean design loads of the local conditions were obtained from mathematical modeling based on in situ and regional measurements. This study defines the platforms design conditions based on a probabilistic reliability approach and it has been used, among others, as a basis for the earthquake design guidelines proposed by the International Standards Organization. A sensitivity analysis was performed starting from the uncertainties of all the input parameters, in order to obtain the best estimate average design spectrum and associated coefficient of variability. The specific approach was to maintain the same safety index adopted by API RP2A code, with a bias modification factor that relates the site nominal spectra with the spectral acceleration that would be used in order to satisfy the API requirements. The results of this approach make possible the use of site specific detailed environmental data and the proven standard procedures established on the API RP2 codes, with significant cost reduction in terms of both platform and foundation design. The considerable amount of tectonic, seismological, and geotechnical information was the principal factor allowing the above methodology.
- OSTI ID:
- 433963
- Report Number(s):
- CONF-960525-; TRN: IM9709%%397
- Resource Relation:
- Conference: 28. offshore technology conference, Houston, TX (United States), 6-9 May 1996; Other Information: PBD: 1996; Related Information: Is Part Of 28. annual offshore technology conference: Proceedings. Volume 2: Platform and marine system design; PB: 947 p.
- Country of Publication:
- United States
- Language:
- English
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