In this paper, further analysis from the result of spun pile test under reverse flexural load and combined with two levels constant axial load, 40 tons (0.08fc'Ag) and 80 tons (0.16fc'Ag) is presented. The analysis is related to the confinement behavior of the concrete section of pile using the low amount of spiral reinforcement. It was shown that the strain readings from the spiral reinforcement indicate a subtle contribution regarding the confinement mechanism of the hollow section of a pile. In addition, it was evident that spiral reinforcement seems to be compressed when the concrete section resists compression strain due to flexural load. The crushing of concrete at ultimate condition could also not be resisted by spiral reinforcement by any means.
The post-punching behavior of slab-column connections with the employment of engineered cementitious composite (ECC) material was investigated. Two specimen models were modeled and simulated in the finite element program to predict the limit of punching shear resistance and post-punching shear behavior due to lateral load. The first specimen was constructed using regular concrete as the control specimen. The second specimen was built with ECC material at the local thickening at drop panel area and regular concrete at the rest of the members. ECC material was selected due to its superior performance with high tensile strain of more than 2% through multiple micro-cracking with width of less than 80 μm. The results highlighted an improvement of shear capacity and post-punching behavior at the second specimen. Furthermore, compressive damage of post-crushing response on the second specimen also indicated less crushing phenomenon at the critical perimeter than that of the first specimen.
Results of an experimental investigation on shear-critical responses of small-scale reinforced concrete beams fabricated with normal concrete (NC) and concrete blended with supplementary materials using Class F fly ash (SMFA) are presented. The beams were reinforced with adequate stirrups as per requirement specified in design specifications. The beams were tested using Ohno beam testing setup to induce direct shear mechanisms across the shear plane. It was also intended to evaluate the shear capacity of a disturbed region (D-region) where the flexural moment was negligible. It was found that all beams fail in brittle shear manner, showing a significant increase of shear forces with a subtle increase in beam deflection. It was also found that the use of adequate stirrups could cease the localised crack formation. In overall results, it was found that the use of Class F fly ash as cement replacement was applicable because the response did not differ significantly.
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