Abstract
During the past few decades, composite beams (steel I beam and concrete slab) have had a wide range of uses, particularly in bridge construction. This is due to its relatively low economic cost compared to individual steel structures or reinforced concrete structures. This type of bridges in particular and many similar industrial structures in general are repeatedly subjected to fatigue loads, and that is frequently, as a result of the vehicles passing on these bridges or the vibrations caused by the machines in the industrial facilities. It has been observed during the successive studies that they have been interested in studying this problem that it is concerned with the external structural behavior of these beams such as a load –deflection relation, observing the cracks appearing during the failure stage and the strain in the steel and concrete flanges. Hence, in this study we have focused on several factors affecting mode of failure of these beams under the fatigue loads, and the common element in all stages of failure was the shear stud, specifically the welding collar at the base of this stud as it is a structurally weak region.
Highlights
Steel- concrete composite beams have been widely used in building and bridge construction
The advantages of these beams in comparison to traditional reinforced concrete girders can be clearly seen in their ability to bend and stiffness. This is due to the benefits of the composite action, which is achieved by connecting the concrete slab and steel section and utilizing the speed of manufacturing time
I n this paper, the main purpose was to study the effect of fatigue loads on the failure shape in the weld region of the shear studs used in the composite beams
Summary
Steel- concrete composite beams have been widely used in building and bridge construction. The advantages of these beams in comparison to traditional reinforced concrete girders can be clearly seen in their ability to bend and stiffness. This is due to the benefits of the composite action, which is achieved by connecting the concrete slab and steel section and utilizing the speed of manufacturing time. The tests led to a relationship between the shear stress acting on connectors and the number of loading cycles They proposed the “S–N” method as the most reliable for determining the shear connectors’ fatigue life. Johnson [2] used experimental data on composite beam fatigue tests to predict the fatigue life of shear connectors: lg N 8lg Δτ 22.123
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