Research on mechanical properties of main girder and pier of T-shaped bridge crossing railway during horizontal swivel construction
In order to study the mechanical characteristics of the main girder and pier of the T-shaped bridge during horizontal swivel construction,this paper takes the T-shaped swiveling bridge of a cer-tain crossing railway in Datong as the basis and uses the finite element software Ansys to establish a solid model of the structure above the upper turntable to analyze the stress variation law of the main girder and pier under different rotation angular speeds and accelerations.Then,the feasible range of rotation angular speed and acceleration during the rotation of the T-shaped bridge were determined.The results show that the stress distribution of the main girder is symmetrical,and the maximum stress is at the root of the main girder,while the stress of the pier is the maximum in the section con-necting the main girder and the upper turntable.When rotating at a constant speed,the stress on the main girder and pier is approximately proportional to the square of the rotation angular speed.As the rotation angular speed is 0.02 rad/min,the maximum stress on the main girder is 0.5 Pa and the max-imum normal stress on the pier is 0.08 Pa,indicating that the rotation speed has little effect on the swiveling bridge.In the accelerated rotation state,the stress on the main girder and pier is propor-tional to the rotation angular acceleration.When the rotation angular acceleration is 1×10-3 rad/s2,the maximum normal stress on the main girder is 0.16 MPa and the maximum shear stress on the pier is 0.14 MPa.In the actual swivel construction of T-shaped bridge,the rotation angular speed is 0.017 rad/min,and the maximum rotation angular acceleration is 8×10-4 rad/s2,and it takes 100 minutes to complete the rotation smoothly.
万方数据
维普
