摘要
针对某引水工程所采用的复式波纹管伸缩节,考虑材料非线性、接触非线性、几何非线性特性,采用有限单元法对伸缩节在不同位移荷载作用下的受力特性和破坏模式进行了计算,并分析了限位装置对伸缩节位移补偿能力的影响。结果表明,波纹管伸缩节的位移补偿极限能力与伸缩节是否设有限位装置及位移模式有关。当无限位装置时,波纹管的应力通常最先达到屈服强度和极限强度而破坏,其极限承载能力可达设计值的2~3倍,具有较高的安全储备;当有限位装置时,在轴向位移作用下,铰链板通常先于其它构件破坏,而在横向位移及其组合位移模式下,伸缩节的位移补偿极限能力取决于波纹管的承载能力。
Taking into account the nonlinearity of material,contact and geometric,the mechanical characteristics and failure modes of one double-bellow expansion joint used in a water diversion project are calculated by finite element method,and the influence of caging device on the bearing capacity of expansion joint is also analyzed. The results show that the ultimate displacement compensation capacity of expansion joint is related to the displacement mode and whether there is a caging device.When there is no caging device,the stress of bellow usually reaches the yield strength and ultimate strength earlier and bellow fails first,but the ultimate bearing capacity of bellow under all the conditions can reach two to three times of design value,so the bellows have a high safety margin. When the caging hinge is equipped,the hinge plates usually fail first under axial displacement,while subjected to vertical or multi-directional displacements,the ultimate compensation capacity of expansion joint depends on the bearing capacity of bellows.
引文
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