Experimental investigation and design of corroded stud shear connectors

Abstract

In this study, the effect of corrosion on the static behavior of stud shear connectors was investigated. Two series of push test specimens having different stud diameters were fabricated according to Eurocode 4. The test specimens were first corroded to different corrosion rates by electronic accelerating method. Static loading tests were then performed to obtain the load-slip curves and ultimate strengths of corroded test specimens. Material properties of the concrete and steel studs used in the test specimens were also measured. Actual corrosion rates were measured from the studs obtained from the tested specimens. Design methods specified in current design standards are used to predict the design strengths of test specimens. It is shown that the design strengths are unconservative for corroded test specimens. Therefore, a new design equation is proposed which enables the designer to consider the effect of corrosion.

Behaviour of Corroded Single Stud Shear Connectors

“…Two series of corroded push out test specimens were also tested for comparison. The test specimens were corroded and tested using the same procedure described by Chen [ 6 ]. The materials used in the push out test specimens were the same as those used in the single stud test specimens (different from the test specimens used by Chen [ 6 ]).…”

“…The test specimens were corroded and tested using the same procedure described by Chen [ 6 ]. The materials used in the push out test specimens were the same as those used in the single stud test specimens (different from the test specimens used by Chen [ 6 ]). The measured corrosion rates of the studs and ultimate strengths are shown in Table 7 and Table 8 .…”

“…Many studies have been conducted to evaluate the effect of the corrosion of reinforcing bars on concrete structures [ 1 , 2 , 3 , 4 , 5 ]. However, there are few studies that have been conducted on the effect of corrosion on the behavior of stud shear connectors used in steel-concrete composite beams [ 6 , 7 ].…”

“…The deterioration in strength of stud connectors due to fatigue damage has also been reported [ 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 ]. Chen [ 6 ] has investigated the behavior of corroded shear stud connectors based on push out test specimens. However, the corrosion rates of four stud shear connector push out test specimens were different.…”

Experimental Research and Simulation on the Mechanical Performance Degradation of Corroded Stud Shear Connectors

“…Upon the formation of cracks, the aggressive medium can easily reach the stud position further leading to stud corrosion, as shown in Figure 1. Corrosion degrades the mechanical properties of the studs and the bond performance between the concrete and studs, which ultimately degrades the structural performance of the entire bridge [4]. Correct, precise, and comprehensive understanding of the mechanical properties of corroded studs is the basis of durability assessment, life prediction, and the computer simulation analyses for steel-concrete composite bridges.…”