论文部分内容阅读
该文提出一种便于试验室内布置的短梁模型等效斜拉索,利用该模型可进行足尺拉索阻尼器试验研究。等效原则为,附加阻尼器后等效模型一阶振动频率及模态阻尼与其原型按张紧弦理论计算得到的相应值相等。该文首先提出了等效模型的概念及参数;然后,对比水平张紧弦-线性粘滞阻尼器系统的振动分析理论,对等效模型进行了自由振动和有阻尼振动的参数分析,采用数值方法分析了模型的振动特性;最后比较模型与原型的振动特性,提出确定模型参数的方法。数值模拟结果表明:按上述方法得到的等效模型与原型一阶振动频率及附加相同阻尼器后模态阻尼比的差值均小于5%,等效模型具有良好的精度。
In this paper, a kind of equivalent stay cable for short beam model which is easy to be arranged in the laboratory is proposed, which can be used to test the full-scale cable damper. The equivalent principle is that the first-order vibrational frequency and modal damping of the equivalent model after adding the damper are equal to the corresponding values calculated by the prototype of the tensioned string theory. In this paper, the concepts and parameters of equivalent model are first proposed. Then, the vibration analysis theory of horizontal visco-linear damper system is compared with the parametric analysis of free vibration and damped vibration of equivalent model. Methods The vibration characteristics of the model are analyzed. Finally, the vibration characteristics of the model and the prototype are compared, and the method of determining the model parameters is proposed. The numerical simulation results show that the difference between the equivalent model and the first-order vibration frequency of the prototype and the same modal damping ratio after the same damper are less than 5%, and the equivalent model has good accuracy.