桅杆结构的风振疲劳分析  

Analysis of Wind-induced Fatigue in Guyed Steel Masts

作　　者：王之宏[1] 

机构地区：[1]卡尔斯鲁厄大学

出　　处：《特种结构》1994年第3期3-8,共6页Special Structures

摘　　要：本文提出了对桅杆结构进行疲劳风振分析的一种方法；借助于桅杆所在地的风速资料，利用接近于实际的风模拟荷载，对桅杆结构进行时域内的非线性分析，从而得到了风载下桅杆结构易破坏处应力的时程曲线。通过雨流点数计算方法，可得到不同风速下、不同应力水平下的结构年实际循环次数，并可确定结构在已使用时间内不同应力水平下的实际循环次数，结合结构疲劳Ｐ—Ｓ—Ｎ曲线及Ｍｉｎｅｒ线性累积损伤理论，可对桅杆进行剩余寿命估计。A method is presented for the analysis of wind-induced fatigue in guyed masts. With the application of the realistic simulated wind,the time domain investigation of nonlinear guyed mast as a 3-dimensional structure taking account of the fluctuating wind on the guys are performed.Using the rainflow cycle-counting algorithm,the alogwind response of guyed mast could be analyzed to obtain the number of counts in an hour of specified stress at a given mean wind speed. The response at different wind speeds in all directions are analyzed in order to enable prediction of stress/counts to be made over the range of wind speeds likely to occur in the life of mast. Making use of frequency of occurrence data enables the number of hours per year of bands of wind speeds that are likely to occur, to be predicted. Hence the number of counts of the specified stress ranges per year is derived and a stress history over the design life of mast obtained. In conjunction with the fatigue S-N curses and forth a modified Miner's rule, it is possible to estimate the remaining fatigue life of guyed mast.

关 键 词：桅杆结构 风载荷 疲劳分析 

分 类 号：TU323[建筑科学—结构工程]