Research On Mechanical Properties Of Beam Components Based On Membrane Effects Under The Load Evenly Arranged

Steel structure is widely used in practical projects for it’s light weight, high bearing capacity,superior seismic performance,economic and aesthetic appearance in recent years. With the research of the steel structure more and more in-depth, take it’s high strenth, exceptional ability in deformation become a hot in structure design. As be one of the main stress components in steel structure, the section and structure form of the steel beam such as thin-wall box girder、castellated beam、curved beam、hollow flange beam、X-section beam、hollow steel beam etc, become more and more plentiful. The development of a new type of beam would be the key research in this paper, and it’s mechanical properties would be studied by static analysis.According to the structural form and mechanical characteristic of membrane structure, a new type of beam component was developed based on film effects in this dissertation. Elastic-plastic load - displacement characteristics、ultimate bearing capacity of strength and rigidity of this component under the uniformly distributed load are investigated through the finite element analysis method. Considering the effects of material nonlinearity and geometric nonlinearity, the steel was regarded as an ideal elastic-plastic material.The results demonstrated that demonstrated the new steel beam has higher stability and preferable load-bearing performance in contrast with ordinary steel box girder and H-section beam. Meanwhile, the influence of type of load、span ratio of the component、height to width aspect ratio of the section、ratio of height to sectional thickness、flakiness ratio、the shape and arrangement of the built-in pipe on component mechanical properties are focused in the paper, and the influence laws were summarized, which could be the reference for the optimization of this new beam components design.The Stiffness calculation formula of Membrane effect beam, which took the influence of component buckling, but also introduced stiffness correction factorβ, was put forwarded under distribution load.Connection calculating in steel structure is the important component in design and construction process。This paper studied the pressure type of high strength bolts’capacity calculating problems in view of the deficient provision about the pressure type of high strength connection in《Code for design of steel structures》 (GB50017-2003). All of this not only Puts forward opinions for code revision but also does the prelude work for the further connection problems studying.