水工波纹管伸缩节位移补偿极限能力研究
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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.
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
[1]李正良.水电站压力钢管用波纹管伸缩节的质量控制方法[C]∥水电站压力管道---第六届全国水电站压力管道学术会议论文集.北京:中国水利水电出版社,2006:367-369.
[2]张为明,鲍乐,汪飞,卫书满.波纹管伸缩节在水利水电行业的应用与展望[C]∥水电站压力管道---第八届全国水电站压力管道学术会议论文集.北京:中国水利水电出版社,2014:331-339.
[3]GB/T 12777-2008金属波纹管膨胀节通用技术条件[S].
[4]The Expansion Joint Manufacturers Association.Standards of the expansion joint manufacturers association[S].New York:Expansion Joint Manufacturers Association INC,2008.
[5]石长征,伍鹤皋,李云,等.跨活断层倒虹吸明钢管对断层错动的适应性及抗震性研究[J].水力发电学报,2012,31(2):198-205.
[6]胡蕾.地面式明钢管结构对活断层位移和地震作用的适应性研究[D].武汉:武汉大学,2015.
[7]刘园,石长征,伍鹤皋.水电站地面明钢管地震响应有限元分析[J].水电能源科学,2014,32(7):86-89.
[8]郎振华.多层S型波纹管力学性能分析[D].大连:大连理工大学,2012.
[9]刘文川,张锡文,何枫.简化有限元方法的波纹管模态分析[J].应用力学学报,2007,24(2):289-293.
[10]吴海林,伍鹤皋.水工波纹管伸缩节非线性有限元分析[C]∥第六届全国水电站压力管道学术会议论文集.北京:中国水利水电出版社,2006:361-366.
[11]姚琳.Ω形波纹管膨胀节极限载荷的研究[D].北京:北京化工大学,2006.
[12]朱浩川,姚谏.不锈钢材料的应力-应变模型[J].空间结构,2011,17(1):62-69.
[13]郑宝锋,舒赣平,沈晓明.不锈钢材料常温力学性能试验研究[J].钢结构,2011,26(5):1-6.
[2]张为明,鲍乐,汪飞,卫书满.波纹管伸缩节在水利水电行业的应用与展望[C]∥水电站压力管道---第八届全国水电站压力管道学术会议论文集.北京:中国水利水电出版社,2014:331-339.
[3]GB/T 12777-2008金属波纹管膨胀节通用技术条件[S].
[4]The Expansion Joint Manufacturers Association.Standards of the expansion joint manufacturers association[S].New York:Expansion Joint Manufacturers Association INC,2008.
[5]石长征,伍鹤皋,李云,等.跨活断层倒虹吸明钢管对断层错动的适应性及抗震性研究[J].水力发电学报,2012,31(2):198-205.
[6]胡蕾.地面式明钢管结构对活断层位移和地震作用的适应性研究[D].武汉:武汉大学,2015.
[7]刘园,石长征,伍鹤皋.水电站地面明钢管地震响应有限元分析[J].水电能源科学,2014,32(7):86-89.
[8]郎振华.多层S型波纹管力学性能分析[D].大连:大连理工大学,2012.
[9]刘文川,张锡文,何枫.简化有限元方法的波纹管模态分析[J].应用力学学报,2007,24(2):289-293.
[10]吴海林,伍鹤皋.水工波纹管伸缩节非线性有限元分析[C]∥第六届全国水电站压力管道学术会议论文集.北京:中国水利水电出版社,2006:361-366.
[11]姚琳.Ω形波纹管膨胀节极限载荷的研究[D].北京:北京化工大学,2006.
[12]朱浩川,姚谏.不锈钢材料的应力-应变模型[J].空间结构,2011,17(1):62-69.
[13]郑宝锋,舒赣平,沈晓明.不锈钢材料常温力学性能试验研究[J].钢结构,2011,26(5):1-6.