Nonlinear Finite Element Analysis Of Wall-beam Structure

Wall-beam structure is used widely ,because it not only meets some buildings' demands for heavy space of the ground floor and low space of upper strata ,but also saves the material of reinforcement concrete greatly ,reduces the construction costs and shortenes the time limit for a project. However,it belongs to deep beams, and its material constitution is complex, its stress distribution is extremely complex. So, in order to use this structure form safely and rationally, we need to carry on deeper and more careful researches on it. Under this background ,the paper carries on the numerical simulation and analysis of the wall-beam structure . Following the main research contents and conclusions:First, analyzes the existing constitutive relationships of concrete , reinforcing bar and bond stress-slip in R.C in an all-round way, sets up a constitutive relationship of wall-beam model for 3-D finite element analysis.The analysis results indicate it is rational and feasible, and it has greater improvement than 2-D model.Second, works out a set of space analysis procedure in FORTRAN according to the 3-D finite element analysis theory and method,then adopt it to carry on finite element analysis of simply supported wall-beam, observe the mechanics characteristic of composite deep beam in wall-beam and the distributing law of stress and strain.Third, through the analyzing on wall-beams with different height-span-ration of supported beam and wall,studies the two factors' influence over the law of stress' and strain' distributing.Studies show that height-span-ration of wall has great influence over the distributing law of wall-beams' stress and strain,wall-beam with low height-span-ration can't fully display its bearing capacity and advantage. Height-span-ration of supported beam has great influence over ductility and bearing capacity of wall-beam.But comparatively speaking, on the premise of meeting structure requirement,a changelet in its value has little influce over the distributing of wall-beam' stress and strain.