Translated Title
Experiment on Behavior of Reinforced Concrete Beams with Steel Fiber Under Impact Load
Translated Abstract
The purpose of this research is to understand the impact-resistant behavior of reinforced concrete(RC) beams with hooked-end steel fibers. A series of 6,simply-supported concrete beams with different volume fractions of steel fibers and different shear reinforcement ratios were tested under free-falling drop-weights,impacting the speci-mens at the mid-span. An analysis was made of the effects of different shear reinforcement ratios and different volume fractions of steel fibers on the impact-resistant behavior of RC beams. The crack patterns of the specimens were re-corded using a high speed video camera. The strains of longitudinal and transverse steels were recorded,and the time histories of mid-span displacement were described in detail. The results obtained are as follows:under the same im-pact load and with the increase of stirrup ratio,the reinforced steel shows a less frequent occurrence in yield and fail-ure,and the maximum crack width decreases under impact load;Under impact load,improving the volume frac-tions of steel fibers only has negligible effect on the concrete matrix strength,but for the whole stiffness of the specimens the effect is more obvious. Meanwhile increasing steel fiber content will reduce the strain of stirrups, making specimen reinforcement play a better role;The increase of volume fractions of steel fibers can significantly reduce the occurrence and development of cracks in specimens. Changes in the crack pattern of the beam occur at the same time,making the area of crack occurring relatively concentrated on the mid-span in the form of vertical cracks,while reducing the cracks near the support.
Translated Keyword
impact-resistant behavior
crack pattern
strains of longitudinal
RC beam
mid-span displacement
Access Number
WF:perioarticaltianjdxxb201510002
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