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在移动谐振荷载作用下,依据周期结构响应的性质,将无限长浮置板轨道响应的问题求解转化到在一块浮置板长度范围内进行,并通过浮置板的位移影响矩阵在频域内实现了钢轨和不连续浮置板的耦合,求得了该范围内钢轨的动力响应,进而以此为基础求得了轨道结构上任意一点的动力响应。结果表明:移动谐振荷载作用下,在移动荷载自身激振频率附近,浮置板轨道位移响应频谱达到峰值;随着移动谐振荷载速度的增大,在频谱上,荷载自身激振频率附近很窄的频段位移响应会有所下降,而在其他大部分频段位移响应会有显著增加;当谐振荷载激振频率与浮置板轨道的固有频率一致时,发生共振现象,在频谱上位移响应的峰值远远大于其他激振频率时响应的峰值;浮置板轨道在移动荷载作用下,存在由荷载周期通过不连续浮置板和扣件而引发的参数激励;当移动谐振荷载激振频率接近有限长浮置板形成驻波的频率时,轨道结构也会产生较大的位移响应。
Under the action of moving resonance load, according to the properties of the periodic structure response, the problem of the infinitely long floating slab track response is solved and transformed into the length of a floating slab, and the influence matrix of displacement through the floating slab is realized in the frequency domain The coupling between the rail and the discontinuous floating plate is obtained, and the dynamic response of the rail in this range is obtained. Based on this, the dynamic response at any point on the rail structure is obtained. The results show that under the action of moving resonance load, the displacement response spectrum of the floating slab reaches a peak near the self-excitation frequency of the moving load. With the increase of the moving resonance load speed, the frequency of the vibration near the self-excited load is very narrow The displacement response will decrease slightly in most of the frequency bands and the resonance response will increase significantly when the natural frequency of the resonant load agrees with the natural frequency of the floating plate orbit. The peak value of the displacement response in the spectrum Which is much larger than that of other exciting frequencies. Under the action of moving load, the floating plate orbit has parameter excitation caused by the loading cycle through the discontinuous floating plate and the fastener. When the moving resonance load is near the limited excitation frequency When the long floating plate forms the frequency of the standing wave, the orbital structure also produces a larger displacement response.