CAJ | 학술논문

采用拉索参数振动和索－梁－塔相互振动的有限元方法，以1993年Fujino进行的索梁结构试验模型为对象，进行随机荷载下拉索参数振动计算和分析。结果表明，当随机荷载强度达到一定水平时拉索发生参数振动，横向振动位移远高于主梁位移；三自由度的理论解析法只适用于主梁竖向一阶频率与拉索横向一阶频率之比为2∶1的索梁结构，对于主梁竖向二阶频率与拉索横向一阶频率之比为2∶1的索梁结构，该方法求得的主梁竖向位移偏小。
채용랍색삼수진동화색－량－탑상호진동적유한원방법，이1993년Fujino진행적색량결구시험모형위대상，진행수궤하재하랍색삼수진동계산화분석。결과표명，당수궤하재강도체도일정수평시랍색발생삼수진동，횡향진동위이원고우주량위이；삼자유도적이론해석법지괄용우주량수향일계빈솔여랍색횡향일계빈솔지비위2∶1적색량결구，대우주량수향이계빈솔여랍색횡향일계빈솔지비위2∶1적색량결구，해방법구득적주량수향위이편소。
An experimental model of cable -beam structure, conducted by Fujino in 1993, was calcu-lated and analyzed about the cable parametric vibration subjected to random excitation , by finite element ( FE ) method , which can take the cable parametric vibration and the coupled vibration between cable and beam-tower into account .The result shows that the cable parametric vibration is excited when the random load increases to a certain value , and the horizontal displacement of cable is much larger than that of beam .The theoretical analysis method , considering three degree of freedoms , is merely appropriate for the cable -beam structure , with the ratio of the first vertical frequency of beam to the first horizontal frequency of cable is close to 2 ∶1 .When the ratio of the second vertical frequency of beam to the first horizontal frequency of cable is close to 2 ∶1 , the vertical displacement of beam obtained by the theoretical analysis method is much smaller .