The analysis of the failure of deformed bellow expansion joint of town gas power pipeline network in service found that the deformation of the bellows were mainly caused by installation error and ground settlement.

• 通过对在役煤气动力管网中失稳变形波纹管膨胀节的损伤分析；发现波纹管失稳变形主要是由于安装误差和地基下沉而引发的.