Abstract
Welded headed studs are used to connect steel girders and concrete slabs in steel composite bridges. However, environmental problems related to welded shear connectors have been reported, including noise and dust generation during the replacement and demolition of damaged or worn concrete slabs. To overcome these issues, demountable shear connectors that enable easy replacement of damaged or worn concrete slabs must be developed. However, conventional bolted shear connectors mainly use embedded nuts, which cannot be used in structures such as bridges because initial slip occurs and the stiffness and shear resistance strength are relatively low. To address these issues, this paper proposes a bolted shear connector that integrates the embedded nut part into the stud bolt and has a tapered shape at the bottom of the expansion column. For performance verification in regard to static shear strength and slip displacement, push-out tests were performed according to Eurocode-4, and the performance of the proposed stud bolt was compared to those of conventional welded headed studs and embedded nut-style bolted shear connectors. In addition, an analytical review was performed using the ABAQUS program for the 1/4 axisymmetric model of the push-out test. As a result of applying the material nonlinear model and the surface contact analysis, the load-slip displacement of each analysis model showed a tendency extremely similar to the experimental results. The proposed demountable bolted shear connector exhibited excellent shear performance and can be used as a satisfactory replacement for conventional welded studs because it meets slip displacement and ductility standards.
Highlights
In South Korea, research has been actively conducted on precast slabs since the 2000s with the objectives of providing high-quality cast-in-place slabs and shortening construction times, and interest in prefabricated bridges has greatly increased recently
Even though many studies have been conducted on improving slab performance, wear and damage to concrete slabs accelerate due to the increasing number of heavy vehicles and the use of deicing chemicals, and slabs require replacement much sooner than steel girders
The load–slip displacement specimens to measure the relative slip between the steel girders and concrete slab and the Sensor locations: (a) and stud The strain gauge installa curve for each experiment isthan thethe displacement curve of the in the universal testing machine (UTM) load case load–displacement values of linear variable difdifferential transformers (LVDTs) the UTM.installed stiffnesses of the specimens to measure the relative between steel girders and low concrete slab and the repeated load partsslip of specimen
Summary
In South Korea, research has been actively conducted on precast slabs since the 2000s with the objectives of providing high-quality cast-in-place slabs and shortening construction times, and interest in prefabricated bridges has greatly increased recently. Most studies on precast slabs have been focused on joints between slabs along the bridge length (prestressing or loop joints), and the concept of prefabrication has rarely been applied to shear connections between girders and slabs. The service lives of the steel girders are very long compared to those of the concrete slabs, in which wear of material increases greatly with time. Even though many studies have been conducted on improving slab performance, wear and damage to concrete slabs accelerate due to the increasing number of heavy vehicles and the use of deicing chemicals, and slabs require replacement much sooner than steel girders
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