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Steel and Composite Structures Volume 50, Number 6, March 25 2024 , pages 659-674 DOI: https://doi.org/10.12989/scs.2024.50.6.659 |
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Static and fatigue performance of short group studs connector in novel post-combination steel-UHPC composite deck |
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Han Xiao, Wei Wang, Chen Xu, Sheraz Abbas and Zhiping Lin
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| Abstract | ||
| Casting Ultra High-Performance Concrete (UHPC) on an orthotropic steel deck and forming a composite action by connectors could improve the steel deck fatigue performance. This study presents the mechanical performance of a proposed post-combination connection between UHPC and steel, which had a low constraint effect on UHPC shrinkage. A total of 10 push-out tests were conducted for static and fatigue performance investigations. And the test results were compared with evaluation methods in codes to verify the latter's applicability. Meanwhile, nonlinear simulation and parametric works with material damage plasticity models were also conducted for the static and fatigue failure mechanism understanding. The static and fatigue test results both showed that fractures at stud roots and surrounding local UHPC crushes were the main failure appearances. Compared with normally arranged studs, group arrangement could result in reductions of static stud shear stiffness, strength, and fatigue lives, which were about 18%, 12%, and 27%, respectively. Compared with the test results, stud shear capacity and fatigue lives evaluations based on the codes of AASHTO, Eurocode 4, JSCE and JTG D64 could be applicable in general while the safety redundancies tended to be smaller or even insufficient for group studs. The analysis results showed that arranging studs in groups caused obviously uneven strain distributions. The severer stress concentration and larger strain ranges caused the static and fatigue performance degradations of group studs. The research outcome provides a very important basis for establishing a design method of connections in the novel post-combination steel-UHPC composite deck. | ||
| Key Words | ||
| failure development; group studs; numerical analysis; push-out test; steel-UHPC composite bridge deck | ||
| Address | ||
| Han Xiao: Department of Bridge Engineering, Tongji University, Shanghai 200092, China Wei Wang:Shanghai Municipal Engineering Design Institute (Group) Co. Ltd., Shanghai 200092, China Chen Xu:Department of Bridge Engineering, Tongji University, Shanghai 200092, China Sheraz Abbas:Department of Bridge Engineering, Tongji University, Shanghai 200092, China Zhiping Lin:Fujian Expressway Group Co. Ltd, Fujian, China | ||