The Finite Element Analysis Of The Effective Width Of The Concrete Slab And The Amplified Stiffness Coefficient Of The Composited Beam In Steel Frame

Steel structure used more and more widely because of its high strength, light weight and construction speed, especially in high-rise steel frame structure, and it has become the preferred system of the residential market. The large number of applications of steel frame structures are bound to have a reasonable design requirements to achieve the best balance between security and the economy. So it has important practical significance.The combined effect of the floor space for steel-concrete composite frame structure lateral performance bearing capacity and stiffness has important informance which can not be ignored, in order to facilitate consideration of the contribution of the floor, the specification put forward the concept of the effective width and stiffness amplification factor, but the value of the existence of the force pattern does not match, the equivalent criteria does not match too rough even irrational aspects. To solve these problems, this paper select the widely used in practice rectangular steel column-pressed steel plate for composite structures and rectangular steel column-a combination of structural steel truss floor two systems were studied, respectively, one and a half span Pin to examine the local structure of the object, the establishment of a large number of housing-real fine finite element model, based on extensive research of the factors floor ultimate bearing capacity of the equivalent value of the effective width of the criteria under the frame beam stiffness and rigidity equivalent amplification factor based criterion factors, and substituting a preliminary theoretical literature proposed formula was verified fitting, more accurate and reasonable considering the effect of the floor space for the relevant provisions provide theoretical support. While ensuring the ANSYS software to reflect lower concrete strength under confining pressure increased the premise, to a certain extent, to verify the reasonableness of the relevant literature suggests that the presence of reinforced concrete truss confining pressure for this hypothesis.The results show that:in the role of positive and negative moments, the effective width of the floor value is not as standardized as suggested in the span of related, but have close ties with the column size, beam height, width, and floor beam flange width and other factors. Within a certain range, the stiffness of the main factors of the amplification factor of the composite beams include span and steel girders stiffness. By comparing the rectangular steel tube column-pressed steel plate for composite structures and precast concrete rectangular steel column-the effective width and equivalent stiffness of reinforced composite structure floor truss, steel truss found confining pressure for concrete action reflected here is not obvious.