Abstract
Pipes can be damaged by strong external forces such as earthquakes. In particular, gas leaks and interruptions to water supply can cause serious secondary damage. This is one of the damage factors caused by earthquakes in urban areas. Bellows-type expansion joints for pipes are flexible and have low rigidity and good adaptability to relatively large deformations. Therefore, bellows-type expansion joints can be applied as seismic separation joints to improve the seismic performance of pipes. In this study, seismic performance considering low cycle fatigue was estimated for bellows-type expansion joints. Monotonic and cyclic loading tests for bending were performed on 80A 3ply bellows- type expansion joints manufactured by laminating three layers of 0.3 mm stainless steel plates. In the cyclic loading test, the multi-step increasing amplitude cyclic loading test to which the displacement history is amplified stepwise was applied and a constant-amplitude cyclic loading test considering various amplitudes was used to estimate the low-cycle fatigue life. In the case of the constant- amplitude cyclic loading tests, low cycle fatigue behavior was observed for 1/4 amplitudes of leakage displacements of monotonic loading tests.
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