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摘要:
Ultra-High Performance Concrete (UHPC) is a new type of cement-based composite material that exhibits exceptional compressive strength, tensile properties and durability compared to ordinary concrete. Compre-hensive research on the flexural fatigue behavior of prestressed UHPC beams is presented in this paper. The failure mode of the fatigue beam is the fatigue fracture of the tensile steel bar in the pure bending section. In the fatigue process, the fatigue behaviors of prestressed UHPC beams including crack width, midspan deflection, the strain of UHPC in compression zone and strain of high-strength steel bars exhibit two stages which are corre-sponding to damage initiation, steady damage propagation. The residual deflection at the midspan increases with the increase of fatigue cycles. The prestressed UHPC beam reinforced with high-strength steel bars shows stable structural behavior even after concrete cracking. The S-N expression of prestressed UHPC beam with consid-eration of the influence of stress amplitude of high-strength steel bars is proposed. The stiffness degradation formula of the fatigue beam and calculation methods of fatigue crack width and fatigue deflection are proposed.
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来源 :
STRUCTURES
ISSN: 2352-0124
年份: 2022
卷: 43
页码: 1778-1789
4 . 1
JCR@2022
4 . 1 0 0
JCR@2022
JCR分区:2
中科院分区:3
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