| It is very important to develop the urban rail transit with the urbanization.There are many urban rail transit forms.The straddle monorail traffic is able to match different landforms with good economy,making it gradually became one of the preferred schemes.The increase of the span has led to the application of steel-concrete composite bridges and continuous bridges.Therefore,it is very necessary to carry out simulation of coupling vibration between straddle monorail train and continuous beam bridges.Based on the 3×70 m continuous girder bridges,the paper establishes the bridge model through ANSYS software and straddle monorail train model through UM(Universal Mechanism).The main research contents are as follows:Firstly,this paper introduces the theory of structural dynamics and multi-body dynamics,and describes the co-simulation method of vehicle-bridge coupling dynamic analysis.Then the track beam model and the monorail train model are established from Chongqing straddle monorail field test.The combination model is simulated and analyzed.The results are compared with that of measured ones to check the reliability and accuracy degree.It shows that the co-simulation method can be applied to spatial vibration calculation of other similar straddle monorail vehicle-track beam system.Then,a continuous beam bridge model was established.The reliability was verified by the natural vibration frequency of the intergral model and the combined one.The calculation of the monorail vehicle-bridge-pier coupling vibration is carried out.Results show:the maximum horizontal and vertical deflection of the bridge is 0.699 mm and 17.692 mm respectively,the maximum acceleration of the bridge is 0.243 m/s~2 and 0.208 m/s~2,the maximum acceleration of the vehicle is 0.224 m/s~2 and 0.450 m/s~2.All indexes meet requirements.Finally,the influences of parameters are simulated.Results show:the acceleration of vehicle will grow with the increase of the surface irregularity of driving wheel;the vertical acceleration of vehicle will grow with the increase of the spring vertical stiffness and driving wheel radial stiffness;the vertical deflection decrese with the increase of monorail bridge,cross beam and pier width.And acceleration of the bridge will decrease with the increase of track bridge and pier width. |
