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Fatigue behavior evaluation of full-scale OSD-UHPC composite bridge deck system
Highlights Reveal of the fatigue damage process of the OSD-UHPC composite deck. Comparison of the fatigue resistance between the U-rib bolted joint and butt-welded joint. Fatigue test results comparison for the studs between the push-out test and the beam test. Discussion on the applicability of existing S-N curves for fatigue evaluation of UHPC from three levels. Proposed S-N curves of UHPC to evaluate its anti-fatigue cracking ability.
Abstract To investigate the fatigue performance and fatigue damage process of the Orthotropic Steel Deck (OSD) - Ultra-High Performance Concrete (UHPC) composite bridge deck, a two-span continuous full-scale specimen was designed and tested under cyclic loading. Test results showed that the fatigue cracks firstly initiated near the lower part of the weld toe of the rib-to-cross beam welded joint, and then cracks along the weld length of the U-rib butt-welded joint developed. These observations followed by the OSD-UHPC interface debonding. The U-rib bolted joint exhibited better fatigue resistance than the U-rib butt-welded joint. The S-N curves of the rib-to-cross beam welded joint, the U-rib butt-welded joint and the U-rib bolted joint were established based on existing fatigue test data, and were compared with provisions in design codes. The S-N curves from the beam test for the short-headed stud connectors were compared with that from the push-out test. And the established S-N curves with 95% survival probability from the push-out test could be used to assess the global fatigue performance of the composite deck. Considering the durability-based critical crack width of UHPC, the established tensile S-N curve regarding critical UHPC crack width of 0.05 mm could be used to evaluate the anti-fatigue cracking ability of the UHPC layer in the composite deck system.
Fatigue behavior evaluation of full-scale OSD-UHPC composite bridge deck system
Highlights Reveal of the fatigue damage process of the OSD-UHPC composite deck. Comparison of the fatigue resistance between the U-rib bolted joint and butt-welded joint. Fatigue test results comparison for the studs between the push-out test and the beam test. Discussion on the applicability of existing S-N curves for fatigue evaluation of UHPC from three levels. Proposed S-N curves of UHPC to evaluate its anti-fatigue cracking ability.
Abstract To investigate the fatigue performance and fatigue damage process of the Orthotropic Steel Deck (OSD) - Ultra-High Performance Concrete (UHPC) composite bridge deck, a two-span continuous full-scale specimen was designed and tested under cyclic loading. Test results showed that the fatigue cracks firstly initiated near the lower part of the weld toe of the rib-to-cross beam welded joint, and then cracks along the weld length of the U-rib butt-welded joint developed. These observations followed by the OSD-UHPC interface debonding. The U-rib bolted joint exhibited better fatigue resistance than the U-rib butt-welded joint. The S-N curves of the rib-to-cross beam welded joint, the U-rib butt-welded joint and the U-rib bolted joint were established based on existing fatigue test data, and were compared with provisions in design codes. The S-N curves from the beam test for the short-headed stud connectors were compared with that from the push-out test. And the established S-N curves with 95% survival probability from the push-out test could be used to assess the global fatigue performance of the composite deck. Considering the durability-based critical crack width of UHPC, the established tensile S-N curve regarding critical UHPC crack width of 0.05 mm could be used to evaluate the anti-fatigue cracking ability of the UHPC layer in the composite deck system.
Fatigue behavior evaluation of full-scale OSD-UHPC composite bridge deck system
Shi, Zhanchong (Autor:in) / Su, Qingtian (Autor:in) / Kavoura, Florentia (Autor:in) / Veljkovic, Milan (Autor:in)
Engineering Structures ; 275
01.01.2022
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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