Bridges expand and contract
due to temperature changes. Actual bridge
temperatures may be quite different
from
idealisation used in design. Recent analytical studies have shown that
existing procedures are often irrational. Sometimes predicted
movements are too
small and this leads to damage and deterioration in the bridge. These will
significantly shorten the bridge life. In other cases, the movements are too
large and this leads to the selection of inappropriate expansion joints and
bearings. In case of integral structures, it leads for over-dimensioning. The
paper presents preliminary results of ongoing research in Poland. Preparation
of new design guidelines for selection of bridge
temperatures and thermal
movements is the aim of this effort. It will result in better long-term
performance of bridges and decrease initial and longterm maintenance cost. In
general, it will increase durability of bridges.