| Castellated(or cellular) member is a kind of steel members with honeycomb hole in the web, that is made of the I-shaped steel(or H-shaped steel) by special cutting and welding craft. Because of its reasonable bearing force, high bending stiffness and prominent economic benefit, castellated(or cellular) steel member has been widely studied and applied in recent years. But there is no technical standard on design of castellated(or cellular) steel member in our country. At present, there are some study on castellated(or cellular) beams and castellated(or cellular) steel column, but the study on tapered cellular steel member and the application of cellular steel member in structural entirety is still in initial stage in our country.In order to use the cellular steel member in the actual structure better, some finite element models built by analysis software ANSYS are applied to study the mechanical properties of the tapered cellular steel member and the tapered cellular steel portal rigid frame. For tapered cellular steel parts, the study on its stress performance is not in depth, we build some finite element models of tapered cellular steel columns of different member length tapering ratio and pore size firstly, in order to study the tapered cellular portal rigid frame easily. Then, we build up some finite element models of tapered cellular portal rigid frame of different vector cross ratios, cellular voussoir beam rates and other parameters for studying its structural performance. To highlight the superiority of the cellular steel member, we compare them with solid models.Through the finite element analysis, we study failure patterns and bearing capacity of the tapered cellular members and tapered cellular portal rigid frame under the action of static load. We found that main failure modes of the tapered cellular members under pressure and bending moment is related buckling—both overall flexural buckling and local buckling, and the influence of member length and the shortest section height on bearing force is most. As for tapered cellular portal rigid frame, its failure mode is mainly local buckling of the beam, and the middle bridge occurs snap through buckling. The influence of tapered cellular member length and rise to span ratio on its bearing capacity is obvious.in addition, based on vierendeel truss theory of verhulst model, a simplified method of calculating strength of tapered cellular beams in the elastic stage is presented. The calculations of above method is quite equal to the results of finite element analysis, which can meet the design needs of industry. |
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