In order to analyze the flexural performance of the fiber reinforced concrete composite deck and understand its stress process and failure mode,based on a steel box girder bridge with a steel roof-fiber reinforced concrete com-posite deck,a local full-scale model was designed and fabricated to carry out the bending performance test of positive bending moment and negative bending moment,and analyze the working curve,failure mode,stress mechanism and crack development and distribution of the composite bridge deck in the whole bending process.The research shows that the positive bending moment specimen is divided into elastic section,elastic-plastic section and failure section;the negative bending moment specimen is divided into elastic section,working stage with cracks and steel yield stage.In the cracked working stage of the elastic-plastic section or the negative bending moment specimen,both the bottom edge and the web of the T-rib flange plate yield.Since the stiffness of the T-rib is small in the overall structural stiffness,the structural stiffness of the composite plate is not significantly weakened.The failure of the positive moment specimen was caused by the crushing of the top edge of the fiber reinforced concrete,while the failure of the negative moment specimen was caused by the yielding of the steel bars in the fiber reinforced concrete slab.
关键词
组合桥面板/纤维混凝土/正弯矩/负弯矩/足尺模型/抗弯试验
Key words
composite deck/fiber-reinforced concrete/positive bending/negative bending/full-scale model/bending test
维普
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