Abstract

In order to examine the dynamic response of a girder-orbit-moving load coupling system considering the constraint effect of the orbit extension, an analytical calculation method for the dynamic response of the girder-orbit system with arbitrary boundary conditions under a moving load is proposed based on the finite Fourier transform. Using the analytical calculation method, the dynamic response of the girder-orbit system with orbit extension at different moving load speeds is calculated, and the calculated results are compared with ANSYS finite element numerical calculation to examine the effect of moving load speed, orbit and girder flexural stiffness, interlayer spring stiffness, and orbit extension length on the dynamic response of the system. Results show that the analytical calculation results are in good agreement with the ANSYS calculation results, verifying the correctness of the analytical calculation method. The amplitude-moving load velocity relationship curve of the girder-orbit system dynamic response is a waveform curve. The interlayer spring stiffness, orbit flexural stiffness, and orbit extension length have significant effects on the dynamic response of the orbital layer, but the effect on the dynamic response of the girder layer is not significant.

摘要

为研究考虑轨道延伸约束效应的梁-轨道-动载荷耦合系统的动力响应，提出了一种任意边界条件下的梁-轨道系统在动载荷作用下动力响应的解析计算方法。基于有限傅立叶变换。采用解析计算方法，计算了轨道伸长的梁-轨道系统在不同移动载荷速度下的动力响应，并将计算结果与ANSYS有限元数值计算进行比较，检验移动载荷速度、轨道和梁的影响。弯曲刚度、层间弹簧刚度和轨道延伸长度对系统动态响应的影响。结果表明，解析计算结果与ANSYS计算结果吻合较好，验证了解析计算方法的正确性。梁-轨道系统动态响应的幅动载荷速度关系曲线为波形曲线。层间弹簧刚度、轨道抗弯刚度和轨道延伸长度对轨道层动力响应有显着影响，但对梁层动力响应影响不显着。