输煤栈桥振动引起双层网壳储煤仓疲劳损伤研究
发布时间：2018-09-13 07:49
【摘要】：输煤栈桥悬挂于网壳结构的疲劳问题备受关注,但网壳结构的疲劳损伤与输煤栈桥的振动存在什么样的关系,目前有关的设计规范中还没有明确的规定,这就极大地制约了这种结构形式的推广应用。本文以漳州后石某发电厂圆形储煤仓为工程背景,分析由于输煤栈桥的振动引起双层网壳结构疲劳破坏问题,弄清楚储煤仓疲劳破坏机理,借助有限元分析软件ANSYS Fe-safe的数值分析手段,由栈桥振动产生的等幅应力为外荷载,通过时程分析法得出结构各个杆件应力时程谱,将应力时程谱通过雨流计法得出应力循环历程。结合材料循环的S-N曲线,采用Miner累积损伤理论对构件的疲劳寿命进行估算。得出的应力谱可以找出整体结构的疲劳危险区域。结构的疲劳性能主要和结构的材料、所承受的外荷载等因素有关,结构的材料决定了疲劳分析的S-N曲线。对圆形储煤仓双层网壳结构进行的疲劳分析,结果发现,结构的疲劳性能主要和栈桥振动的振幅、栈桥振动的频率有关。以栈桥的竖向振动为外荷载,并且两个悬挂点的相位差为225°进行疲劳分析,经过循环加载后,结构发生了疲劳破坏,破坏区域主要发生在节点的焊缝处。此次疲劳分析的数据和结论可为圆形储煤仓双层网壳结构疲劳安全设计及可靠性提供一定的依据。
[Abstract]:The fatigue problem of coal conveyance trestle suspended in reticulated shell structure has attracted much attention. However, the fatigue damage of latticed shell structure and the vibration of coal conveyance trestle are not clearly regulated in the relevant design code. This greatly restricts the popularization and application of this structural form. Taking the circular coal storage bunker of a power plant in Houshi, Zhangzhou as the engineering background, this paper analyzes the fatigue failure problem of the double-layer reticulated shell structure caused by the vibration of the coal conveyance trestle, and makes clear the fatigue failure mechanism of the coal storage bunker. With the help of the finite element analysis software ANSYS Fe-safe, the equal amplitude stress generated by the vibration of the trestle is an external load, and the time-history spectrum of the stress of each member of the structure is obtained by time-history analysis. The stress cycle history is obtained by means of the rain meter method. Combined with the S-N curve of material cycle, the fatigue life of members is estimated by Miner cumulative damage theory. The obtained stress spectrum can find out the fatigue hazard zone of the whole structure. The fatigue performance of the structure is mainly related to the material of the structure, the external load and so on. The material of the structure determines the S-N curve of the fatigue analysis. The fatigue analysis of circular coal storage bunker double-layer reticulated shell structure shows that the fatigue performance of the structure is mainly related to the vibration amplitude of the trestle bridge and the frequency of the trestle bridge vibration. The vertical vibration of the trestle bridge is taken as the external load, and the phase difference of the two suspension points is 225 掳for fatigue analysis. After cyclic loading, the fatigue failure of the structure occurs, and the damage area mainly occurs at the weld seam of the joint. The data and conclusions of this fatigue analysis can provide some basis for the fatigue safety design and reliability of double layer reticulated shell structure of circular coal storage bunker.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU399;TU312.3
[Abstract]:The fatigue problem of coal conveyance trestle suspended in reticulated shell structure has attracted much attention. However, the fatigue damage of latticed shell structure and the vibration of coal conveyance trestle are not clearly regulated in the relevant design code. This greatly restricts the popularization and application of this structural form. Taking the circular coal storage bunker of a power plant in Houshi, Zhangzhou as the engineering background, this paper analyzes the fatigue failure problem of the double-layer reticulated shell structure caused by the vibration of the coal conveyance trestle, and makes clear the fatigue failure mechanism of the coal storage bunker. With the help of the finite element analysis software ANSYS Fe-safe, the equal amplitude stress generated by the vibration of the trestle is an external load, and the time-history spectrum of the stress of each member of the structure is obtained by time-history analysis. The stress cycle history is obtained by means of the rain meter method. Combined with the S-N curve of material cycle, the fatigue life of members is estimated by Miner cumulative damage theory. The obtained stress spectrum can find out the fatigue hazard zone of the whole structure. The fatigue performance of the structure is mainly related to the material of the structure, the external load and so on. The material of the structure determines the S-N curve of the fatigue analysis. The fatigue analysis of circular coal storage bunker double-layer reticulated shell structure shows that the fatigue performance of the structure is mainly related to the vibration amplitude of the trestle bridge and the frequency of the trestle bridge vibration. The vertical vibration of the trestle bridge is taken as the external load, and the phase difference of the two suspension points is 225 掳for fatigue analysis. After cyclic loading, the fatigue failure of the structure occurs, and the damage area mainly occurs at the weld seam of the joint. The data and conclusions of this fatigue analysis can provide some basis for the fatigue safety design and reliability of double layer reticulated shell structure of circular coal storage bunker.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TU399;TU312.3
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