Research On Lightweight Of Main Girder Of Bridge Crane Based On ANSYS

Bridge cranes are the products with the largest production and the largest material consumption in the lifting machinery.At the present stage,the optimization of the girder mainly uses traditional calculation methods,which cost time and energy.Strengthening the research on the production technology of bridge girder will greatly promote the production and processing enterprises.Based on the finite element method,this paper uses ANSYS to simulate the bridge crane main girder in the computer.The finite element model is established by parameterized command flow,the static and dynamic analysis and optimization design of the main girder are carried out.The main research contents of this article include:(1)Based on the reasonable simplification of the main girder structure,APDL parametric modeling was used to establish a three-dimensional finite element model of the main girder;(2)The analysis of the main girder under the six kinds of operating conditions including lift on load,lifting operation of the trolley,sudden braking of the operating structure,sudden unloading,1.25 times the amount of load,and slanted lifting of the mast was carried out,and 1.25 times of the load was determined as a dangerous working condition.Get the maximum stress and maximum displacement of the main beam.Comparing the simulation results with theoretical results for different operating conditions,the theoretical deflection error is about 5%,the stress error is within 5%,the error is within a reasonable range,and the rationality of the established model is verified.;(3)The sensitivity of the girder was analyzed to determine the optimal variables.The main girder was optimized with the deflection and stress as the constraint function.After re-analysis of the optimized main girder,the maximum stress is 127.24 MPa and the maximum deflection is 29.23mm;(4)Perform load test on QD50t-16.5m main girder to test the stress at 25 measurement points of the 5 sections,and the mid-span deflection.Stress simulation and test error within18%;(5)The modal analysis of the optimized main girder model is performed to obtain the natural vibration frequency and vibration shape under the conditions of no-load andload-carrying.The results of modal analysis show that with the increase of load,the frequency range of natural vibration decreases.During the movement of the load from the end to the middle,the frequency range of natural vibration decreases.The minimum frequency is 5.38 Hz,and the natural frequency meets the requirements;(6)Use VB6.0 as a development tool to call ANSYS software to compile a set of practical,versatile,easy-to-use applications.The function of modeling,analysis and theoretical calculation can be realized by inputting the main girder parameters.This program provides a reference for the design of a main girder.