Laboratory of Analysis and Reliability of Offshore Structures - LACEO


Encouraged by an intense exchange with PETROBRAS for the fulfillment of countless scientific and technologic projects since 1977, LACEO has specialized on research and development of computational methodologies, procedures and programs for the static and dynamic analysis of fixed and compliant offshore platforms. These activities include analysis and numerical modeling of fixed platforms and their foundations, static and dynamic analysis (deterministic and random) of floating stationery platforms and their risers and submarine pipelines; and analysis and statistical treatment of the random dynamic response of offshore structures, among others. LACEO researchers were involved on the project of the first jacket structures installed in the Brazilian coast; the anticipated floating production systems, the floating production units such as semi-submersed platforms and the FPSOs ships with turret type or differentiated compliant (DICAS) anchorage. Currently, they act on projects of new concepts of floating units for oil production with low vertical movement.

                                                                         Production floating systems

During the last 15 years LACEO has also acted in the area of structural reliability and has employed this methodology on important PETROBRAS projects, such as the use of polyester fibers in Taut Leg mooring system lines allowing oil exploitation in deeper waters of the Brazilian coast. Other projects developed in this area deal with risk based inspection planning of oil industry equipment and structures. In this approach the results of previous inspections are considered to establish the schedule for future inspections. 

                                         Optimization of fatigue periodical inspections of fixed platform joints

Through the development of numerical models of local analysis using finite element method, LACEO has worked in several innovative projects in partnership with PETROBRAS such as: torpedo-stake project, flexible risers for bodies of water equal or greater than 2800m project and re-qualification of flexible lines obtaining service life extension through their use in new applications.

                                                                                     Local analysis of a flexible pipe

The interaction with industry qualified LACEO to develop computational programs for specific areas of offshore engineering such as:

• Analysis of risers and mooring systems
• Analysis of floating unit movements
• Foundation analysis
• Statistical analysis of temporal series
• Structural reliability analysis
• Fatigue inspection planning in fixed platforms


                                                                  Structure random analysis – Estimation of response extreme values

LACEO seeks to contribute to the academic knowledge and professional curriculum of its undergraduate, and master and doctoral degree students, involving them, whenever it is possible, in its technological projects.

Research lines

LACEO research lines are mostly devoted to the actual challenges of offshore oil exploration and exploitation. Currently the main research lines are:

• Probabilistic methods for offshore structure analysis and design
• Vortex induced vibrations and movements (VIV e VIM)
• Numerical models for soil-structure interaction in offshore riser and stake analysis
• Local and integrity analyses of flexible pipes



Currently LACEO occupies a room of approximately 200m2 in the basement of Block I-2000 of COPPE/UFRJ and has a computational infra-structure to house 25 researchers.  Besides, the laboratory counts with a cluster of personal computers with more than 50 processors. However, in a short time LACEO will have new facilities that are being constructed, in partnership with other laboratories in a COPPE/UFRJ annex.






Prof. Luís Volnei Sudati Sagrilo (professor responsável)
Prof. Edison Castro Prates de Lima
Prof. Gilberto Bruno Ellwanger




Marcos Queija de Siqueira



Technicians and administrative staff



Ana Cristina da Cunha Silva Gonçalves