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Fatigue performance of sfpsc under damp heat environment and cyclic bending load

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Document pages: 12 pages

Abstract: The research group has developed a new structural material steel fiber polymer structural concrete (sfpsc), which has the characteristics of high strength and toughness, and is applied to the bridge superstructure in humid and hot environment. In order to study the fatigue performance and durability of sfpsc in hot and humid environment, the decoupling method of environment and fatigue load and the coupling effect of environment and fatigue load are adopted or developed. The three-point bending fatigue test of environment and cyclic load decoupling was carried out on the sfpsc samples pretreated in hot and humid environment, and the coupling test of environment and cyclic load was carried out on the sfpsc samples in hot and humid environment Then, the effects of hot-wet environments and the experimental methods on the fatigue mechanism of SFPSC material were discussed, and the environmental fatigue equations of SFPSC material under coupling and uncoupling action of hot-wet environments and cyclic bending loads were established. The research results show that the fatigue limits of SFPSC under the coupling action of the environments and cyclic loads were lower about 15 . The proposed fatigue equations could be used to estimate the fatigue lives and fatigue limits of SFPSC material.

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