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  1. 2 Czasopismo Techniczne

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  1. 2 2015

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  1. 2 Furtak K.

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Fatigue bearing strength of connection with flexible connectors

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Furtak K.
Czasopismo Techniczne
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PL
The paper presents an analysis of the effect of load variations on the bearing strength of connection in steel–concrete elements with flexible connectors in the form of bolts. Data relating to the residual stresses from concrete slab shrinkage have been included in the analysis. The results of the author’s experiments on the effect of variable loads on the bearing strength of the connection have been discussed following the author’s experimental studies. Following the analysis of the results, it can be stated that the bearing strength of a connection with flexible connectors is significantly affected by the rigidity of the steel girder and slab (coefficient d) together with the parameters of load cycles (k, R) and the value of concrete shrinkage strain.
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The assessment of the impact of concrete shrinkage on stress level at the interface between the steel and concrete

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Furtak K.
Czasopismo Techniczne
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-
PL
The paper analyzes the influence of sequence of construction of the concrete slab in concrete-steel composite beams on effects of shrinkage of concrete, hence on longitudinal shear force to be transferred across the interface between steel and concrete. Typical as well as staged construction methods have been considered. Different sequences of construction result in different geometrical characteristics of the composite section, including the cross-sections and the moments of inertia, and hence also the longitudinal and bending stiffness. The relationship between the stiffnesses of components of composite beams represents the coefficient d. Based on the analysis it can be concluded that the level of normal and tangential stresses at the interface between the steel and concrete is dependent on the coefficient δ. Consequently, the stresses are also dependent on the sequence of construction of the concrete slab. Moreover, the stresses also depend on the creep of concrete and longitudinal slab reinforcement ratio.
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