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Bending and thermal performance of new energy-saving slotted reinforced concrete beams

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Document pages: 14 pages

Abstract: The traditional solid reinforced concrete (RC) beam is modified into a slotted beam to be considered as a thermal insulation structural component. The slotted beam is composed of an outer beam and an inner beam respectively. Along the width direction of the beam, there is a groove near the middle of the beam for filling thermal insulation materials. The bending and thermal properties of slotted beams are studied. Three RC reference solid beams and six slotted beams were fabricated, and four point bending tests were carried out. The test results show that the failure modes of slotted beams and solid beams are bending failure. However, in the final loading stage, the damage process of slotted beams is different from that of solid beams. The moment curvature analysis shows that the tensione reinforcement ratio of the outer and inner beams had an important effect on the flexural behavior, especially the ductility of the slotted beams. Thermal study indicated that the heat transfer coefficient of the slotted beam was greatly reduced and the thermal inertia factor increased a lot, compared with the solid beam. In addition, FE simulation results showed that a new frame structure using slotted beams exhibited obvious and attractive thermal insulation property.

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