混合より線を緊張材とする圧着型片持ち梁の力学的性状に関する研究

概要

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Precast prestressed (PCaPC) structures have high restoring force and their damage concentrate at gaps between members. Therefore, they require very little repair after earthquakes. However, they dissipate small energy and lateral displacements tend to be larger than those of RC structures under seismic loadings. In order to enhance the energy dissipation of PCaPC structures, Graded Composite Strand (GCS) has been proposed. In this study, new types of GCS's were developed and five PCaPC cantilever beams with new GCS's were tested. A specimen with GCS-H, which consists of ultra high strength wires and low strength wires, had increased equivalent damping factor with keeping residual deformations small. Low strength wires of GCS-H dissipated energy by yielding, and ultra high strength wires remained elastic and provided restoring force. All specimens had small damage and structures with GCS's would need almost no repair. The ultimate flexural moment capacity was calculated accurately by considering bond deterioration of strand. An FEM model which simulates the gap and crack openings provided accurate load-rotation relations when strands were unbonded.
一般社団法人日本建築学会の論文
2007-03-20