Considering The Effect Of Residual Stress On Bearing Capacity Of Cellular Component Under Axial

Cellular steel components are formed by Solid web steel members after cutting and dislocation welding, compared to the prototype solid web steel members, in the premise of not increasing the amount of steel, it can increase the sectional resistance moment, improve flexural bearing capacity. Frame structure of large span using cellular beams and columns, can not only reduce the structural weight, save steel, but more conducive to walking through the pipes, lines, increase the structural headroom, while the exposed structure will fit people’s purpose which of beauty.Welding residual stresses are produced after steel components experiencing uneven heating and uneven cooling in high temperature welding process, it is an initial stress in the internal components and can be self-equilibrium. For the cellular component, numerical size and distribution of welding residual stress is an important factor affecting the overall stability of the bearing capacity of members, their presence will lead to section stiffness reduction, early yield. The processed forms vary of cellular steel components is different, for the case of cutting holes in the web directly or welding on solid web member web after cutting dislocation welding, so compare with the solid web member, residual stress distribution will have some different. The existing residual stress distribution model of solid web steel member cannot meet the requirements of the cellular component calculation and analysis.In the past research process of the cellular component, due to the lack of relevant information on their residual stress distribution. We often ignore this important factor, which also caused a lack of Study on compressive member stability of cellular under the influence of residual stress. Based on the consideration of this issue, we use a blind hole method to detect sectional welding residual stresses of seven openings cellular steel members, compared to under two typical hexagonal and circular hole, different opening rate, opening way,cellular structure openings sectional longitudinal welding residual stress numerical size and distribution. Analysis the residual stress distribution characteristics of the cellular structure under the different shape of the opening, the opening rate and welding processing methods, and propose longitudinal welding residual stress distribution model of cellular steel components.On the data base of test for detection of residual stress distribution in the cellular structure, using finite element software ANSYS, establish axial compression column finite element model of two typical pass, the hexagonal cellular aperture and circular aperture. The residual stress is added to the finite element model by the form of initial stress, at the same time, considering the axial compression column initial bending of initial imperfection and material nonlinearity, compare and analysis the effect of residual stress on bearing capacity of axial compression of cellular column stability. Under the consideration of the effect of residual stress under, give a circular hole and hexagonal cellular orifice axial compression column slenderness ratio calculation method. Using the least squares fit to the data, give axial compression cellular λ-φ pillars curve and the formula calculation method, and provide the reference for the practical engineering design of cellular column axial compression.