Mechanical Properties of Shear Stud during and after Fire

Abstract

AbstractMany examples of a bridge damaged due to accidental or incendiary fire heating up the bridge from below have been reported. When steel and concrete composite girder bridges are exposed to fire, it is important to understand the progression of damage to the shear connections. However, determination of the level of damage to the shear connection in experimental tests is a challenge. Furthermore, the postfire performance of the shear connection is not clear yet. To better understand the mechanical properties of the shear stud during and after fire, the authors conducted three different push-out tests of heated studs, in which the fire temperature varied from 300 to 700°C over a period of 90 min. From the results of the static push-out tests conducted after heating, it was found that the maximum shear resistance of shear studs is marginally affected by the heating, but the slip constant was decreased remarkably in proportion to the heating temperature. Furthermore, the fatigue strength of shear studs showed remarkable decrease due to the undesirable slip behavior.Keywords:: composite bridgeshear studpush-out testshear resistance during and after firefatigue strength after fire