Numerical simulation of flexural properties of adaptively distributed PVA fiber reinforced cement-based composites continuous beams
Fibers-reinforcement is one of the effective methods for improving the tensile property of cement-based composites,and the crack resistance and toughness of which can also be enhanced by the incorporation of PVA fibers.The dosage of PVA fibers is adjusted according to the tensile stress of the component,which can utilize to the fiber's full reinforcement,that is,the adaptively distributed PVA fiber reinforced cement-based composites(AD-PFRC).In order to study the enhancement mechanism of adaptively distribution of PVA fibers,numerical simulation of the flexural properties of continuous beams of adaptively distributed PVA fibers reinforced cement-based composites was carried out.The stress contour of continuous beams with different distributions of PVA fibers and the resultant force in the high tensile stress region at the bottom of the beam were compared and analyzed.As the result of numerical simulation shows,when the average volume fraction of PVA fibersis 1.3%,the tensile stress value of AD-PFRC is significantly higher than that of PFRC,and the resultant force in the high tensile stress area at the bottom of the midspan section of the AD-PFRC beam is 12%higher than that of PFRC beam when the ultimate load is reached.The PVA fiber reinforcement of AD-PFRC is significantly improved.
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