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运用双自由度并联模型对静态人体的竖向人致振动问题进行有限元分析.在一阶对称振型中,弹簧质量模型的周期随着刚度K1和K2的增大而逐渐减小,但总大于附加质量模型的周期;同时又随着质量m1和m2的减小而逐渐减小,但也总大于空桥模型的周期;且由于人体与桥梁跨中运动方向相同,因此人体刚度的存在降低了弹簧质量模型的刚度.在二阶对称振型中,刚度K2和质量m2的变化导致了某些振型的出现和消失.进而可以得出结论:附加质量模型相比弹簧质量模型而言,在结构设计方面将偏于不安全;此外,双自由度并联模型中的质量刚度比值较小的自由度对结构振动将起主导作用.
The two-degree-of-freedom parallel model is used to simulate the vertical human induced vibration in static human body. In the first-order symmetric vibration mode, the spring mass model period decreases with the increase of stiffness K1 and K2, but the total Which is larger than the period of the additional mass model. At the same time, it decreases with the decrease of the masses m1 and m2, but it is always larger than the period of the bridge model. Because of the same movement direction between the body and the bridge, the human body stiffness is reduced In the second-order symmetric modes, the changes of the stiffness K2 and the mass m2 lead to the appearance and disappearance of some modes, and then it can be concluded that the additional mass model, compared with the spring mass model, In structural design, it will be insecure. In addition, the degree of freedom of mass stiffness ratio in dual DOF parallel model will play a leading role in structural vibration.