PhD Candidate, University of Manitoba
Reinforced concrete (RC) structures such as parking garages and bridges are subjected to harsh environmental conditions which result in corrosion of the reinforcing steel bars. In the last two decades, fiber reinforced polymer (FRP) reinforcement has been used instead of steel bars to eliminate the deterioration of RC structures due to corrosion. One of the most common RC structural elements are continous beams, which are slender beams supported on more than two supports, i.e., comprising two or more spans. Continuous beams usually encounter different load intensities on adjacent spans. In this research, an experimental investigation was carried out to study the behavior of two-equal span continuous beams reinforced with glass FRP longitudinal reinforcement tested under different loading patterns. The test parameters include loading arrangement on adjacent spans, longitudinal reinforcement configuration, and design criteria. One reference beam was tested under symmetrical loads, while three beams were subjected to unequal loading on the adjacent spans. The widths of cracks and the deflections at mid-spans were evaluated. The test results showed that the span subjected to higher load experienced less crack width and deflection compared to the less load span. Also, the beam that was designed to satisfy serviceability criteria showed small percentage of moment redistribution due to the limited rotation capability of the adjacent critical sections.
Abstract: A finite element model (FEM) was constructed using specialized three-dimensional (3D) software to investigate the punching shear behavior of interior slab-column connections subjected to a moment-to-shear ratio of 0.15 m. The FEM was then verified against the experimental results of full-scale interior slab-column connections reinforced with glass fiber reinforcement polymer (GFRP) bars previously tested by the authors. The FEM results showed that the constructed model was able to predict the behavior of the slabs with reasonable accuracy. Afterward, the verified model was used to conduct a parametric study to investigate the effects of reinforcement ratio, perimeter-to-depth ratio, and column aspect ratio on the punching shear behavior of such connections. The test results showed that increasing the tested parameters enhanced the overall behavior of the connections in terms of decreasing deflections and reinforcement strain and increasing the ultimate capacity. In addition, the obtained punching shear stresses of the connections were compared to the predictions of the Canadian standard and the American guideline for FRP-reinforced concrete structures.
Pub.: 12 Oct '15, Pinned: 08 Jul '17
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