Behavior of short-headed stud connectors in orthotropic steel-UHPC composite bridge deck under fatigue loading
Zhanchong Shi (Tongji University, TU Delft - Steel & Composite Structures)
Qingtian Su (Tongji University)
Dr. Florentia Kavoura (TU Delft - Steel & Composite Structures)
Milan Veljkovic (TU Delft - Steel & Composite Structures)
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Abstract
The short-headed stud connectors play a critical role on the interaction of the orthotropic steel deck (OSD) and the ultra-high performance concrete (UHPC) layer in orthotropic steel-UHPC composite bridge deck. In this paper, the fatigue behavior of these short-headed stud connectors was experimentally investigated in a beam test. The failure modes of the short-headed stud connectors were identified and classified into 5 types. The fatigue test results were analyzed by linear regression analysis neglecting run-outs and treating run-outs as failure respectively. On the other hand, the maximum likelihood estimation (MLE) approach was used to shape the S-N curve by considering the influence of run-outs. Additionally, the push-out and beam fatigue test data were compared, and the push-out test presented a relatively conservative result. Last, the applicability of existing specifications on design guidelines regarding the short-headed stud connectors design in orthotropic steel–UHPC composite bridge deck is discussed, and a design S-N curve with 95% survival probability is proposed.