1 EVALUATION OF SEISMIC RISK OF INDUSTRIAL FACILITIES Mário LOPES 1 , António BRITO 2 , Carlos OLIVEIRA 3 , Francisco SÁ 4 ABSTRACT This paper describes part of a research project aiming at evaluating seismic risk at the Sines industrial complex in Portugal, including the detailed evaluation of the potential seismic performance of some important structures and equipments, and, where possible, to propose measures to reduce seismic vulnerability. The proposals for seismic risk reduction comprise three areas: (i) strengthening or other actions to reduce the vulnerability of specific structures or equipments, (ii) planning, in order to create redundancies in other zones of the country, and (iii) by means of early warning systems. Two types of sets of accelerograms were considered for the purpose of nonlinear time history analysis: for near-field events, short duration accelerograms with high frequency contents and for far-field events, long duration accelerograms rich in low frequencies. Some results regarding the evaluation of seismic vulnerability of structures and equipments are presented and corrective actions are suggested. INTRODUCTION At the early stages of modern earthquake engineering the main concern was the protection of human life, and as a consequence less attention was paid to the lifelines and industrial facilities. Another reason for this was that, at the time, the importance of these facilities was much less than it is nowadays in developed societies. However the concern of these societies not only with the protection of human life, but also with the limitation of economic damage has been increasing, was felt clearly after the 1990´s earthquakes of Northridge (1995) and Kobe (1996), and is already a trend in code development for the main civil engineering structures (buildings and bridges). Damage control in lifelines and industry has also been increasing, especially after the 11 th September 2001, which raised awareness for the need to protect critical infrastructures, first from terrorism, afterwards from all types of threats, including earthquakes and tsunamis. This paper describes part of the portuguese contribution to the REAKT research project, aiming at evaluating seismic risk at the Sines industrial complex. This included the detailed evaluation of the potential seismic performance of some important structures and equipments, and, where possible, to propose measures to reduce seismic vulnerability. Figure 1 shows some of the facilities of the complex, including its deep-sea harbor. 1 Assistant Professor, Instituto Superior Técnico, Universidade de Lisboa, mlopes@civil.ist.utl.pt 2 Dr, Estrutconsult, Lisbon, estrutconsult@gmail.com 3 Professor, Institution, Instituto Superior Técnico, Universidade de Lisboa, csoliv@civil.ist.itl.pt 4 PhD researcher, Instituto Superior Técnico, Universidade de Lisboa, motasa@civil.ist.utl.pt