Author(s)

D. Boote & D. Mascia

Abstract

The behaviour of a structure under a seismic event may be studied in the elastic range by three different procedures. The easiest and most common design approach is represented by a static analysis where all the seismic effects are simulated by equivalent, static forces. Generally, the existing antiseismic design codes supply the criteria to be adopted in this kind of simplified method. The second procedure is based on the modal analysis by response spectra, related to the seismic characteristics of the region considered. A further procedure is represented by a direct dynamic anal- ysis; the structure is submitted to a time-varying acceleration law. In this paper the study of the seismic behaviour of a fixed offshore platform for drilling and production operations is pr

Keywords