Deformation Analysis bridge , gantry crane girder deflection under

Bridge , gantry crane under torsion beam deformation main cause analysis Chengdu Railway Administration Cheng Guanghui Digest analyzed under the bridge , gantry crane girder torsion deformation reasons , elaborated on the impact of the flexible use of performance bridge gantry crane under the crane girder, and made Some methods to prevent deformation of the main beam deflection . Keywords bridge , gantry crane girder bridge deflection analysis , the torsion of its performance under the girder gantry crane will be greatly affected . Bureau ubiquitous bridge , gantry crane chassis flex phenomenon shaped structure under the main beam , main beam deflection under some very serious , affecting the normal use of cranes and endanger the safety of production . A main beam deflection deformation cause analysis under the bridge , because overhead gantry crane scratching under the girder gantry crane is multifaceted, depending on the specific situation should be analyzed , in general, are the following : the impact of irrational design standards of the old days of the Soviet Union , all according to the degree of master Liang Jinggang L/700 design ( where L is the crane span ) , and not for fatigue calculations. Since the one-sided pursuit of lightweight, small size main beam section , the web is thin, poor rigidity , so that the main beam torsion deformation under premature . Our new design specification , the work level of Crane A6 degree L/800, A7, A8 is L/1000, so that to achieve the standard of advanced countries .