Experimental Study of Curved SFRC and ECC Composite Beams

In order to investigate the cracking behavior of curved steel-concrete composite mechanical behavior under a hogging moment, two composite box girders with a central angle of 9º were designed and tested under static loads. In the reported test program, the CCB-1 was designed with steel fiber reinforced concrete (SFRC) slab and shear studs. In contrast, the CCB-2 was designed with Engineered Cementitious Composites (ECC) and Uplift-Restricted and Slip-Permitted (URSP) connectors for enhanced crack resistance. The load-displacement curve, strength and displacement ductility, failure mode, and strain distribution were reported in detail. For the test small curvature beams loaded under the hogging moment, the flexural critical failure mode was observed for both specimens, which was governed by compressive yielding of the top steel plate and tensile yielding of the concrete slab. The URSP connectors effectively reduce the stiffness of the interface slip of composite girders, enhance the interface slip capacity, and reduce the crack width of concrete compared with traditional shear studs.

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