Modality Analysis of Main Girder of Bridge Crane based on ANSYS

Gongwen BIAN1, Qing ZHANG2, Liang ZHOU3

College of Mechanical and Vehicular Engineering, Chongqing Jiaotong University, Chongqing, China

Abstract: The vibration of the main girder of bridge crane causes resonance, fatigue and breakage, and has great influence on the hoisting accuracy of the main girder of the crane. The modal analysis of the main beam of the bridge crane is carried out by using the ANSYS finite element analysis software. The natural vibration modes and natural frequencies of the low order modes of the main beam are obtained, and the dangerous area of the main beam vibration is found out. Optimization followed by the structure of the girder, the natural frequency of the girder to completely avoid the disturbance frequency, limited to solve the resonance problem of the main beam, to reduce the maximum vibration amplitude, improve fatigue and service life of main girder.

Keywords: main girder of bridge crane; Structure optimization; Modality analysis