Limit state of braced frame steel structure under sinusoidal shaking

Abstract

Limit state of braced frame steel structure under sinusoidal shaking was clarified in this study. The load-displacement relationship of the braced frame steel structure was obtained from high acceleration vibration test by using resonance shaking table of CRIEPI. The resonance frequency of the resonance shaking table is 10 Hz, and the natural frequencies of test specimens were set to low, high or equal relative to 10 Hz. In the all cases, a fatigue crack occurred at heat-affected zone of the base near fixed end. The shapes of hysteresis loop became swell and was inclined to the horizontal axis when the load amplitude was exceeded 20kN. The crack initiation and propagation is considered to cause the shapes to change. On the other hand, the buckling or local deformation were not occurred in the all cases.