Coupling Mechanism Of Bridge Gantry Crane Box Girder Structure And Stiffener

Bridge gantry crane are widely used to direct the movement of materials and equipment installation. It is widely used in ports, freight yard handling, structure installation, etc, plays a vital role in the national economy, have made outstanding contributions to promote the development of the whole society. The Continental Crane off-track box girder partition layout spacing ratio of large, simple structure, lightweight, long life, high reliability.Therefore, the research of crane girder structure and stiffeners has very important practical significance.The object of this paper is a partial rail box type double girder overhead crane main beam, research tool is ANSYS finite element analysis software. The research ideas:to write a single main beam APDL parametric procedures, procedures include:modeling, loads, constraints, stiffness calculation, strength calculation, buckling stability and restrained torsion; analysis using ANSYS software loads in the main beam cross, box coupling mechanism between the beam transverse stiffeners and box girder size parameters with off-track box girder stiffness, strength, buckling stability and restrained torsion. The course of the study:write APDL parameterized calculation program-according to the research needs to establish the corresponding finite element model-finite element method-summary of the calculation results.The main beam of a partial rail box type double girder overhead crane, the results show that:the stiffener spacing has little effect on the main beam bending stiffness, and no obvious rule; Stiffener spacing of a certain value (4.8m), the main beam under the flange plate of each node stress curves intersect a certain point, midspan stress of the bottom flange plate in the most uniform stress distribution, average70.0875MPa; the functional relationship between the box girder web thickness and its stability with power function, expression is y=288.69x2.7922,the correlation coefficient is0.9988; if the box girder web height increases, the buckling characteristics value will decreases;if the box girder stiffener spacing increases, its buckling value will decrease, and with the stiffener spacing increases the process gradually slowing down. The box girder stiffener spacing of2.0m to6.0m range, the box girder feature buckling value decreased more gentle, and the downward trend approximately linear;stiffener spacing increases will result in the box girder torsional rigidity decreases, but little impact; unconstrained torsion load, stiffener spacing from1.6m to6m this period, with the increase of stiffener spacing, the main beam midspan flange plate node hand, reduce stress; the stiffener spacing box girder bottom flange plate inter-node corresponding constrained torsion stress is approximately linear relationship. The thesis topics combines National Natural Science Foundation project of China (51175442), the results of the study, especially considering partial rail box girder buckling stability and restraint torsional stress influence, the reference value is greater.