Experimental Study On Flexural Behavior Of Fiber Reinforced Ferroconcrete Member

Fiber reinforced ferroconcrete is an innovative composite which exhibits much highertensile strength, better crack resistance and much higher ductility and tenacity than commonfiber reinforced concrete and ferroconcrete do. However, the application of fiber reinforcedferroconcrete to civil engineering structures has been limited by the lack of research onmechanical behavior of member and structural design method. In this paper, the focus hasbeen on the two kinds of fiber reinforced ferroconcrete, which are polypropylene fiberreinforced ferroconcrete (PFOC) and steel fiber reinforced ferroconcrete (F. C.). The flexuralbehavior of PFOC member and F. C. member are discussed and the structural design method isproposed as follows.1. A structural design method is proposed based on the flexural experiment of fiberreinforced ferroconcrete member. Formulas for the load carrying capacity of fiber reinforcedferroconcrete bending members at different stages of cracking and loading are put forward.The tensile strength of concrete increased by the contribution of fibers and steel wire mesh inthe tensile area are taken into account in the calculation.2. Slabs of polypropylene fiber reinforced ferroconcrete (PFOC) are experimentallyinvestigated. The flexural behavior of PFOC slabs is analyzed and the formula for the loadcarrying capacity of PFOC slab at different stages of cracking and loading is put forward.Tested results show that the load carrying capacity and crack resistance performance of PFOCslabs are improved by the composite of polypropylene fiber and steel wire mesh. Steel wiremeshes in the PFOC slabs have the main influence on the improvement of load carryingcapacity, and polypropylene fibers postpone cracking. PFOC is a new type of compositematerial with good crack resistance and high strength.3. T-beams of steel fiber reinforced ferroconcrete (F. C.) with bars are experimentallyinvestigated. Test analysis is carried out to reveal the flexural behavior of F. C. beams with Tsection and the formula for the load carrying capacity of F. C. T-beam at different stages ofcracking and loading is put forward. The experimental results generally indicate that thewidest crack of F. C. T-beam was not over 0.2mm when the reinforcing bar yielded. This is animportant flexural behavior of F. C. T-beam different from that of common reinforced concretebeam. Based on this flexural behavior the tensile strength of concrete increased by thecontribution of steel fibers and steel mesh in the tensile area is considered in the calculation.The load carrying capacity of F. C. T-beam is determined under the reinforcing bar yielding and meanwhile the widest crack being less than 0.2mm. The crack resistance and the loadcarrying capacity of concrete beam are improved by the the composite of steel fiber and steelwire mesh. F. C. is a good composite material with high crack resistance and high strength.4. A new structure being the composite of F. C. material and rib floor is presented. In thefloor structure with close ribs PFOC is used in the slabs and F. C. in the ribs and beams. Thestructure is then of light-weight and high-strength. In the analysis of the close rib floor theplane cross panel design method of ship structure is adopted and the formulas for the loadcarrying capacity of PFOC slab and F. C. T-beam are used. The floors designed with fiberreinforced ferroconcrete are compared with the floors with common reinforced concrete aswell as with different schemes. It is found that the close rib floor with fiber reinforcedferroconcrete is better than the floor with common reinforced concrete.