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A new test specimen with fiber reinforced plastic cores and face sheets had been used to investigate the effect of stiffness and damping on noise transmission loss.
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Steel fiber reinforced beam specimens with fiber content higher than 0.50% show deflection-hardening behavior.
In contrast, the specimens with fibers sustained the flexural load well even after the first crack formation, due to fiber bridging.
Additional filament wound specimens with fibers aligned along the hoop direction were also prepared to allow a comparison between specimens with inclined fibers and hoop oriented fibers.
Results showed that the hybrid specimen with equal fiber volume ratios for steel and SMA fibers exhibit a lower mid-span deflection and smaller crack width.
Higher compressive strength was obtained for a specimen with higher fiber dosage (6 kg/m3), whereas the lowest value was obtained in control specimen.
However, the AMFRC specimen showed many vertical or diagonal cracks with a narrow crack width, and in particular, the specimen with 0.8%% fiber volume fraction did not show significant concrete spalling and macro cracks even after failure.
Further, the failure mechanism is controlled by the combined shear and flexural action in the SFRC specimen with 1.5% fiber content.
Compared to the NP1F0 specimen having no steel fibers, the HP1F1 specimen with steel fibers exhibited low magnitudes of openings and slips at a similar strain level by forming multiple shear cracks, which means that the steel fibers were very effective for crack control.
At larger displacement, the equivalent viscous damping of specimen without steel fibers is higher than specimen with steel fibers.
The effect of temperature exposure is shown in Fig. 12a for specimen with no fibers and in Fig. 12b for specimen with high fiber dosage of 6 kg/m3.
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