Research Of The Behavior And Design Method On Build-up Steel Plate Girder With Cantilever Segment

In heavy industrial buildings, in order to install conveniently, high-strengthbolted endplate connections are widely used in steel structure joints connections andplates splice. Due to the higher internal force and thicker plates, large numbers ofhigh-strength bolts are needed in the connections. The internal force in theconnecting plates and bolts is also complex, the calculation methods and basicassumptions for ordinary steel structure may not be well applied to the connections.Therefore, it is more significant to do research on the performance of key joints inthe heavy steel structure.In this paper, the ABAQUS finite element analysis and experiment researchhave been carried out to study the real performance of the built-up steel plate girderwidely used in boiler frames with cantilever segment under static loads. Theoptimized design scheme for the cantilever beam was tested and the calculationmethods of splice bolts and endplates in the cantilever segment were put forward.The main contents are listed as follows:Firstly, with reference to the plate girder prototype in the past projects andaccording to the actual experiment conditions and material supply, the scaledspecimen of plate girder was designed, including simply supported and cantileversegment. The scale is1/10. On the basis of the position and size of the loads in theprototype, the loading device and the loading system were determined.Secondly, static test on the built-up steel plate girder with cantilever segmentwas conducted to measure the strain and deformation on the key points of the simplysupported and cantilever segment, so was the displacement of splicing endplates.The failure mode of test model was also gained.Thirdly, the ABAQUS program was used to build up the scaled finite elementmodel of plate girder. Instead of all bolts, the simplified connectors were applied insimulation to analyse the full-path performance of this girder. Extract the results ofthe same positions which were measured during the experiment to reveal the realbehavior by comparison and also to verify the accuracy of simulation method.Fourthly, optimum design method of cantilever segment was raised withconsideration of the number of bolts, the thickness of endplates and flanges, the webplates and stiffeners and other factors. Then the finite element prototype model ofplate girder was established for the full-path analysis and it verified the feasibility ofthe optimization design.Finally, based on the results of finite element analysis and experiment study,the suggested calculation methods of splicing bolts and endplates in cantilever segment were put forward.