Bond Behaviour of Steel-Concrete Connection Of Bases Under Fatigue Loading
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Date
2018-03
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Addis Ababa University
Abstract
The base connections experiences stress reversals as a result of wind loading and can be
subjected to bond degradation of steel-concrete connections due to fatigue loading. The study
focused on the bond behavior of base connections of steel anchorages and concrete when
subjected to fatigue loading. Fatigue loading can initiate cracks in the concrete surrounding
the steel bars that propagate as the number of load cycles increases leading to the destruction
of the concrete-steel interface and slip of the steel bars inside the concrete. This study
investigated the effect of anchorage length and concrete strength on the bond behaviour of
steel and concrete connection of bases subjected to monotonic and low cycle fatigue loading.
The finite element analysis tool ABAQUS was used in this research to model the behavior of
the connection and to study the bond behavior of the connection when subjected to fatigue
loading. This model was then verified against other published numerical models and against
different experimental tests performed in different laboratories. Once the model was
considered representative an extensive parametric study was carried out. The result from this
study illustrates the relationships between different parameters like concrete strength,
embedment length and diameter of the steel and bond behavior. In steel concrete connection,
design verifications for the bond of steel and concrete under fatigue load are required
separately from monotonic loading. The fatigue behaviour of the bond between steel and
concrete was not taken into consideration for current codes. Based on the parameters studied,
repeated loading caused bond failure when subjected to a loading of as little as 76% of their
static capacity.
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Keywords
Finite Element Models, Bond (concrete–steel) stress, Damage Plasticity, BondSlip Relationship, Repeated Loading