Dynamic response analysis of cracked block in tunnel lining under aerodynamic load of high-speed rail
According to the aerodynamic characteristics of high-speed railway tunnel lining wall,the intrinsic frequency and dynamic responses of lining cracks under the action of train wind were studied by numerical simulation based on theoretical analysis and model tests.The effects of the lining crack dimensions and the loading frequencies and peak values of the aerodynamic loads were analyzed.The safety of the lining cracks under the action of the aerodynamic loads was identified.The results show that the intrinsic frequency of the cracked body has a linear relationship with its thickness.It decreases rapidly with the increase of the thickness,and the decline rate is up to 70.29％.The displacement response of the cracked body increases with the in-crease of the peak value of the external load,and is positively correlated with the number of the loading cy-cles.When the frequency of the external load tends to approach to the intrinsic frequency of the structure,the displacements and velocities increase obviously.When the loading frequencies were 1 and 5 Hz,the peak dis-placements at the cantilever end of the cracked body were 10.75％and 13.62％of that with the loading fre-quency of 3 Hz,correspondingly.
万方数据
维普
