動的荷重下における斜材付き配管支持構造の座屈を伴う弾塑性挙動

抄録

In this study, static load tests and high acceleration sinusoidal vibration tests of braced piping supports were conducted. The shape of the piping support was a frame type. A square steel tube was used for the member of the piping support. In the static load test, the buckling occurred at the brace member and the frame member. In the vibration test, the buckling occurred only the brace member. In addition, the fatigue crack occurred at welding heat affected zone of supporting part. The elastic-plastic behavior of the specimen after the buckling was stable in the vibration test. The fatigue crack was not observed until 20 cycle after buckling, and occurred during additional vibration. The primary failure mode of the vibration test was buckling, which was consistent with that of the static load test. The skeleton curve of the load-displacement relationship obtained from the vibration test were in good agreement with that obtained from the static load test. The damping factors of the specimen were calculated from load-displacement loops before and after buckling in the vibration test. The elastic-plastic behavior of the braced piping support with buckling under dynamic load were clarified. In addition, the example of the stable behavior of the braced piping support with buckling under dynamic load was given.