配管系の振動速度に基づく地震時疲労評価法（共振状態からはずれる場合の挙動）

Key Points

• To evaluate fatigue in piping systems during earthquakes using vibration response metrics, highlighting non-resonant behaviors.
• Utilized ASME OM standard velocity criteria for piping vibration response.
• Derived evaluation formula for fatigue accumulation based on cumulative absolute velocity.
• Introduced Ke coefficient from simplified elasto-plastic assessments into fatigue evaluation.
• Confirmed that cumulative absolute velocity correlates with vibration stress.
• Showed decreased evaluation accuracy under high natural frequencies with lower input.
• Demonstrated that non-resonant systems yield smaller responses, mitigating problems.