Nonlinear Finite Element Analysis of Concrete Structures

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b) taoding = 25%
r
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TT
c) loading = 64%
dl
n
loading=98%
Fig. 5.4-5: Crack development with increasing loading.
The loading is expressed in relation to the
predicted failure load.
the stress distribution of the three principal stresses is considered
at 70% loading, i.e., the cracking is slightly more
developed than indicated in fig. 5 c). This stress distribution
is shown in fig. 6, where isostress curves are shown and where
the directions of the principal stresses in the RZ-plane are
given in each nodal point. In accordance with the radial crack
development the distribution of the tangential stresses shows
large regions where tension exists. Only at the support and
notably around the disc do compressive tangential stresses exist.
The distribution of the max. principal stress in the RZ-plane
indicates also large regions loaded in tension. Only in the
vicinity of the disc and notably at the support do small re*-