An Experimental Study on Seismic Performance Evaluation of Multi-Ply Bellows Type Expansion Joint for Piping Systems

Piping systems are a representative social infrastructure to provide oil, gas, and water. Damage piping may cause serious consequences, such as fire, water outage, environmental pollution. Therefore, need be protected from natural disasters, earthquakes. Earthquakes deformation that exceeds design criteria. For example, large relative displacements liquefaction of the ground resulting in loss strength subsidence, side-sway primary structures subjected strong motion critical damage systems. expansion joints maintain flexibility can applied locations where excessive is expected improve seismic performance Metal bellows, type joints, flexible, so they highly durable against fatigue loads. This indicates metal bellows used separation for piping. In this study, experimental research was conducted analyze multi-ply bellows. Monotonic loading tests cyclic were on 2-ply 3-ply results compared. tests, multi-step increasing amplitude loading, which displacement history amplified stages, constant cycling with various magnitudes considered. The test showed no significant difference bending monotonic between two types however, higher low-cycle than