【摘要】 应用单位脉冲函数,建立了简支梁桥的纵向振动频响函数方程,基于传递函数,提出了用于求解多跨简支梁桥纵向位移和轴力的动态频响函数的计算方法.以六跨简支梁桥为算例,求解了跨中最大位移和轴力,并给出了脉冲荷载作用下相应的傅里叶振幅谱.结果表明,中间各跨跨中位移较大,两侧跨中轴力较大,响应谱的变化规律与位移和轴力的变化一致.更多还原

【Abstract】 Based on the unit impulse function principle,the frequency response function equation of longitudinal vibration for simply supported beam bridge is established.According to the transfer matrix principle,the calculation method of the dynamic frequency response function for the vertical displacement and axial force of multi-span simply supported beam bridge is proposed.Taking six crosssimply supported girder bridge as an example,the maximum displacement and axial force are solved,and the corresponding Fourier amplitude spectrum under pulse loads is provided.The calculation results show that the mid-pan displacement in the middle of the bridge is bigger than that in the side of the bridge,but the axial force shows an inverse tendency.The changes of the amplitude spectrums are consistent with the displacement and axial force respectively.更多还原