極限的な地震荷重を受ける配管系の崩壊挙動に対する実験的検討

抄録

Experimental investigation on failure behaviors of piping systems were conducted with elbow pipes made of simulation materials to clarify the possible failure modes under the beyond design level seismic loads. In this study, lead-antimony (Pb-Sb) alloy was adopted as the simulation material, and shaking table tests on piping system models were conducted. The piping system model were composed by two elbows made of Pb-Sb alloy, one additional mass, and steel bars. Input motions were sinusoidal wave. Shaking table tests were conducted on several test conditions by varying the additional mass and frequency of the input sinusoidal wave. From the experiments, it was shown that the failure mode was the ratchet and subsequent collapse, and it seemed that the occurrence of failure mode depended on the frequency ratio and the mass ratio, similar to the results on the single-elbow piping system model conducted in the previous studies. It was also shown that the investigation procedure using simulation materials was effective to investigate the ultimate behavior of piping systems.