地面式明钢管温度作用机理与取消伸缩节研究  

Research on the Mechanism of Temperature Action and the Cancellation of Expansion Joint of Ground Exposed Penstock

作　　者：周伟 姚雷 ZHOU Wei;YAO Lei(Yellow River Engineering Consulting Co.Ltd,Zhengzhou 450003,China)

机构地区：[1]黄河勘测规划设计研究院有限公司,郑州450003

出　　处：《中国农村水利水电》2022年第2期122-127,共6页China Rural Water and Hydropower

摘　　要：以某水电站地面式明钢管为例,建立了水电站钢管结构整体有限元模型,考虑了均匀温度作用和非均匀温度作用对明钢管受力变形的影响,论证了地面式明钢管取消伸缩节的可行性。结果表明:取消伸缩节后钢管的Mises应力远小于钢材允许应力值,虽然上平段钢管产生了较大的轴向应力,但不会引起钢管屈曲失稳,因此从结构强度和稳定性多方面都表明地面式明钢管取消伸缩节是可行的。进一步探究了取消伸缩节后管道结构在不同温度作用下的作用机理,结果表明管道两侧非均匀温度对管道的轴向应力影响很大,可能会引起钢管轴向受压稳定问题,因此对取消伸缩节的明钢管除了进行强度校核以外还需要关注钢管轴向受压稳定性问题。Taking a ground surface steel penstock of a hydropower station as an example,the finite element model of the whole hydropower station is established.The effects of uniform temperature and non-uniform temperature on the stress and deformation of the structure are considered,and the feasibility of canceling the expansion joint is demonstrated.The results show that the Mises stress of steel penstock after canceling the expansion joint is less than the allowable stress value of the steel.The cancellation of the expansion joint makes the steel penstock in the upper horizontal section produce large axial stress,but it does not cause the buckling instability of the steel penstock.From the aspects of structural strength safety and stability,it shows that it is possible to cancel the expansion joint of the ground surface steel penstock.The mechanism of the penstock under different temperature after canceling the expansion joint is further explored.The results show that the nonuniform temperature has a great influence on the axial stress of the penstock,which may cause the axial buckling stability of the penstock.Therefore,it is necessary to pay attention to the axial buckling stability of the steel pipe in addition to the strength check.

关 键 词：地面式明钢管 均匀温度场 非均匀温度场 伸缩节 

分 类 号：TV34[水利工程—水工结构工程]