Research problems that occur during the analysis of the work of FRP-strengthned timber beams under sustained loads

This paper deals with the issues relating to the study of FRP-strengthened timber beams subjected to sustained loads. A special focus was given to the variation in deformability characteristics of these materials and to the resulting processes that occur in the work of the strengthened beams. Aims and objectives of these studies were also presented together with the issues resulting from the requirement to maintain appropriate test conditions. The paper is a theoretical analysis of the problem, conducted prior to the start of preliminary studies.