Konferenz,
LOAD TRANSFER OF MAIN LEG TENSILE FORCES TO FOUNDATIONS
(1984)
Zusammenfassung
After the occurrence of a line damage ,
tensile tests including strain measurements
have been carried out on stubs imbedded
in cone re te. The test results have shown
that .the load transfer from a stub to
a concrete foundation is a complicated
process of adhesive and sliding friction
or compression. Apart from the concrete
strength it is mainly the influence of the
dimensions, the tensile loads in the stub ,
the behaviour of the material and the
distribution of stresses within the total
foundation which will effect load transfer
.
In case of load transfer fr om stubs
without cleats, the maximum load is virtually
given by the y ield stress of the
steel, since the bond s tresses decrease
considerably on account o f the strong
Poisson's ratio effect , i.e. the contraction
of the related steel cross-section
therewith .
In case of force transfer by means of
cleats , the stub forces may be transmitted
until failure of the stub , if the cleats
have been adequately dimensioned. In
t hi s connection it is very important to
ensure that all cleats carry equal
parts of the load .
Results of dynamic l oad s applied to test
specimens have shown that in comparison to
static loads the stub is capable of carrying
higher tensile loads before the transition
from adhesive to sliding friction
occurs.
The results have demonstrated that maximum
safety of a line is reached when the main
leg forces are- safely transmitted to the
foundation by means of cleats until
the stubs fail .
