Abstract
Synergistic effects of friction force on static and fatigue performance of stud-normal strength concrete (NSC) composite connection are clarified in the present study. Push-out specimens with greased interface are used to degrade the interfacial friction force. The static testing and the fatigue testing are carried out to reveal the synergistic effects of friction force on shear performance of stud-NSC connection. The frictional mechanism between stud connected steel-NSC interface is discussed and illustrated. Results show that interfacial friction synergizes with the stud to bear the shearing force and improves the shear performance of stud-NSC connection. In present test, the greased interface-induced friction degradation decreases the shear strength about 8.7 %, the shear stiffness about 13.2 % and the fatigue life about 3.9 % as compared to the case without friction degradation. Friction force between steel-NSC interface is a secondary force and influenced by shearing force from stud, which is easily to be weakened as the repeated wearing between steel plate and concrete during the fatigue loading cycles. The synergistic effects of friction force on shear performance of stud-NSC connection is much slighter than that of stud-UHPC connection, especially its influences on fatigue performance of stud-NSC connection are almost negligible.
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