The analysis of Maslenica
concrete bridge monitoring has been carried out. The bridge was finished in
1997. The
main girders of the superstructure and the arch were analysed during
different construction phases. It appears that there was a considerable
shrinkage of concrete in girders after their pouring because of a relatively
small moisture level at summer time when the measurements were undertaken. This
caused compression in the reinforcement. The stiffness of girders was
determined by means of the modulus of
elasticity, by measuring their natural
frequencies, and by means of concrete compression strength. By measuring
stresses and
displacements during construction and by comparing it with the
values obtained by means of NELIN program which includes the material and
geometrical non-linearity, a solid qualitative correspondence between
theoretical and experimental research results has been established.