Cyclic Loading Test of Reinforced Concrete Frame With Partial Wall Having Steel Damper

Abstract eng:
The structural performance of the non-structural wall in reinforced concrete (RC) frames has attracted much attention in Japan. There are several types of non-structural walls such as spandrel wall, partition wall, wing wall, and partial wall. In the past, a non-structural wall has been connected rigidly to the column and beam without providing the structural slit. However, this causes adverse effects to the RC frame, such as shear failure of the short column with spandrel and partition walls. In recent years, providing a structural slit has become common. As a result, the non-structural wall causes no adverse effects to the RC frame when a structural slit is employed. In addition, the structural slit is mostly used to simplify a design. On the other hand, a non-structural wall with a structural slit is not expected to provide strength. This study focuses on the partial wall in RC frames. The application of a steel slit damper in a partial wall is proposed, as it makes a non-structural wall contribute to seismic performance and utilizes the structural slit effectively. The steel slit dampers applied are hysteretic dampers, which dissipate energy by the flexural yielding of the edge of the steel. Some of the benefits from these dampers include the possibility of energy dissipation resulting from a small displacement, its malleability, and its low-cost manufacturing potential. In this paper, the seismic performance of the RC frames with a partial wall having a steel damper is investigated through cyclic loading tests. Four specimens were used in this study. The first specimen is a partial wall in an RC frame, which is connected to the RC beam without a structural slit (RW). The second specimen is a partial wall in an RC frame with a structural slit (SW). Its partial wall is separated from the RC beam by the structural slit. The third specimen is a steel damper installed in the lower part of the partial wall in RC frames (LD). The fourth specimen is a steel damper installed in the central part of the partial wall in RC frames (CD). The connection between the steel damper and the RC beam is fixed by embedding the PC bar into the RC beam. The connection between the steel damper and the partial wall is fixed by head studs. The specimens with the partial wall having steel dampers LD and CD yield and start to dissipate energy at an early stage, with story drift ratios much smaller than those at beam yielding. However, the difference in the damper horizontal deformation has occurred between the positive and negative loading at the large deformation zone. Based on the damage of the RC frame and the partial wall, the LD and CD specimens have a greater damage control effect than the RW specimen.

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