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Super-high compressive strength, high tensile strength (12~25MPa) and excellent ductility of steel fiber-reinforced reactive powder concrete (SRPC) cause significant difference on structural failure between SRPC structures and ordinary concrete structures. The behavior of SRPC continuous beams is investigated experimentally and numerically in this paper. Five tests were conducted by the authors to obtain the crack distribution and growth, the stain in steel bar during the ultimate load test. The load-deflection behavior and modes of failure are presented for the five tests. A nonlinear finite element model, exploiting the SRPC damaged plasticity material model, was developed and verified against the tests. A parametric study was conducted to study the effects on the global structural behavior due to the change in the SRPC continuous beams geometry, load form, SRPC strength and boundary conditions. The experimental and numerical results were compared with values calculated using current design codes. It is shown that the ultimate loads calculated using current codes are conservative for the SRPC continuous beams investigated in this study. The formulations of the length of equivalent plastic hinge zone and the method of bending moment amplitude modulation are proposed for SRPC continuous beams. The results presented in this paper provide a valuable insight into the behavior of SRPC continuous beams, and can be used as basic reference for structure design of SRPC engineering structures.

Research on Bending Bearing Capacity of Simply Supported Reactive Powder Concrete Beams