A number of initial models were created and used to assess the
performance of both shell and solid element idealisations. LUSAS were fortunate to have been
provided with experimental data (load-strain measurements) with which to validate the
results. This allowed the effects of each type of nonlinearity to be assessed until good
results were obtained for only modest CPU time during analysis. The validated model was
then used as the basis for assessment of other similar structures.
LUSAS were pleased to discover very close agreement
between measured and calculated values of ultimate load. The LUSAS analysis also clearly
showed that the failure mode was plastic collapse; elastic buckling occurred at a much
higher load.
The results of this work were used by Hyder Consulting to help determine
which bearings require strengthening for the additional bridge capacity predicted for the
future. |